diff --git a/README.md b/README.md
index 7e041a3..e7e1e7c 100644
--- a/README.md
+++ b/README.md
@@ -63,7 +63,7 @@ SpineViewer/
    - 零时长动画按单帧静态姿势预览
    - 自动适配并居中
    - 用户可主动将当前帧设为当前素材的自定义缩略图；若已有自定义缩略图，替换前会明确确认
-4. **缩略图**：导入时不运行插件缩略图生成器，由 Eagle 自身处理。用户打开 Spine 预览后，可主动将当前帧设为**当前素材**的自定义缩略图；若已有自定义缩略图，替换前会明确确认。手动缩略图会添加 Spine badge 和导出版本号。
+4. **缩略图**：导入时不运行插件缩略图生成器，由 Eagle 自身处理。用户打开 Spine 预览后，仍可用原有按钮将当前帧设为**当前素材**的自定义缩略图。左侧的“为当前资源组生成缩略图…”会先列出已验证的骨骼、atlas 和贴图，明确确认后才批量处理，并始终跳过已有自定义缩略图的素材。手动缩略图会添加 Spine badge 和导出版本号。
 
 ---
 
@@ -77,7 +77,7 @@ SpineViewer/
 
 Eagle 的公开素材 API 不提供任意自定义元数据字段。预乘设置保存在 Eagle 用户数据目录的 `SpineViewer/preview-settings/` 下，以素材库和素材 ID 区分；不修改 Eagle 的 `metadata.json`、标签或注释，也不会随素材导出到其他电脑。
 
-Atlas 页面路径按不可信输入处理：插件拒绝绝对路径、`..`、盘符、UNC、URI 以及越出允许目录的符号链接；跨素材贴图只从当前 Eagle 素材库中已经枚举并验证的素材选择。导入阶段不由插件生成缩略图；手动操作只能设置当前素材。诊断日志默认关闭；显式设置 `SPINEVIEWER_DEBUG_LOG=1` 时仅写系统临时目录。
+Atlas 页面路径按不可信输入处理：插件拒绝绝对路径、`..`、盘符、UNC、URI 以及越出允许目录的符号链接；跨素材贴图只从当前 Eagle 素材库中已经枚举并验证的素材选择。导入阶段不由插件生成缩略图；手动批量操作只作用于明确列出并得到确认的当前资源组，且跳过已有自定义缩略图的素材。诊断日志默认关闭；显式设置 `SPINEVIEWER_DEBUG_LOG=1` 时仅写系统临时目录。
 
 - 将 Spine 导出的一整套文件（`.skel`/`.json` + `.atlas` + `.png` 等）放在**同一个文件夹**并导入 Eagle。
 - 点击其中任何一个文件即可预览动画；点击配套的贴图或 atlas 也会自动找到整套资源。
diff --git a/_locales/de_DE.json b/_locales/de_DE.json
index 4c49c1e..3f06cac 100644
--- a/_locales/de_DE.json
+++ b/_locales/de_DE.json
@@ -20,6 +20,19 @@
         "backgroundTitle": "50×50-Schachbrett, das mit der Leinwand verschoben und skaliert wird und an Blend-Modi teilnimmt",
         "thumbnail": "Als aktuelles Vorschaubild setzen",
         "thumbnailTitle": "Aktuellen Frame als benutzerdefiniertes 400×400-Vorschaubild dieses Elements setzen",
+        "groupThumbnail": "Vorschaubilder für aktuelle Ressourcengruppe erstellen…",
+        "groupThumbnailTitle": "Aktuelle Spine-Ressourcengruppe prüfen und Vorschaubilder gesammelt erstellen",
+        "groupDialogTitle": "Vorschaubilder für aktuelle Ressourcengruppe erstellen",
+        "groupDialogSummary": "{generate} werden erstellt, {skip} werden übersprungen.",
+        "groupDialogNote": "Nur die unten aufgeführten Elemente werden aktualisiert. Elemente mit eigenen Vorschaubildern werden immer übersprungen.",
+        "cancel": "Abbrechen",
+        "groupConfirm": "Erstellen",
+        "groupWillGenerate": "Wird erstellt",
+        "groupSkipCustom": "Übersprungen: eigenes Vorschaubild vorhanden",
+        "groupUnavailable": "Übersprungen: nicht verifizierbar",
+        "groupNoTargets": "In der aktuellen Ressourcengruppe gibt es keine geeigneten Vorschaubilder.",
+        "groupGenerating": "Vorschaubilder werden erstellt {current}/{total}…",
+        "groupComplete": "Fertig: {success} erfolgreich, {skip} übersprungen, {failed} fehlgeschlagen.",
         "versionTitle": "Spine-Version",
         "reloadTitle": "Ordner neu laden",
         "animationList": "Animationsliste",
diff --git a/_locales/en.json b/_locales/en.json
index 0d44342..de4fc86 100644
--- a/_locales/en.json
+++ b/_locales/en.json
@@ -20,6 +20,19 @@
         "backgroundTitle": "50×50 checkerboard that pans and zooms with the canvas and participates in blend modes",
         "thumbnail": "Set current item thumbnail",
         "thumbnailTitle": "Set the current frame as this item's 400×400 custom thumbnail",
+        "groupThumbnail": "Generate thumbnails for current asset group…",
+        "groupThumbnailTitle": "Review the current Spine asset group, then generate thumbnails in a batch",
+        "groupDialogTitle": "Generate thumbnails for current asset group",
+        "groupDialogSummary": "Generate {generate} item(s) and skip {skip} item(s).",
+        "groupDialogNote": "Only the items explicitly listed below will be updated. Items with existing custom thumbnails are always skipped.",
+        "cancel": "Cancel",
+        "groupConfirm": "Generate",
+        "groupWillGenerate": "Will generate",
+        "groupSkipCustom": "Skipped: custom thumbnail exists",
+        "groupUnavailable": "Skipped: could not verify",
+        "groupNoTargets": "There are no eligible thumbnails in the current asset group.",
+        "groupGenerating": "Generating asset-group thumbnails {current}/{total}…",
+        "groupComplete": "Asset-group thumbnails complete: {success} succeeded, {skip} skipped, {failed} failed.",
         "versionTitle": "Spine version",
         "reloadTitle": "Reload folder",
         "animationList": "Animation list",
diff --git a/_locales/es_ES.json b/_locales/es_ES.json
index fe13211..b0694fc 100644
--- a/_locales/es_ES.json
+++ b/_locales/es_ES.json
@@ -20,6 +20,19 @@
         "backgroundTitle": "Fondo de cuadros de 50×50 que se desplaza y escala con el lienzo y participa en los modos de fusión",
         "thumbnail": "Usar como miniatura actual",
         "thumbnailTitle": "Usar el fotograma actual como miniatura personalizada de 400×400 de este elemento",
+        "groupThumbnail": "Generar miniaturas del grupo actual…",
+        "groupThumbnailTitle": "Revisar el grupo de recursos Spine actual y generar miniaturas por lotes",
+        "groupDialogTitle": "Generar miniaturas del grupo actual",
+        "groupDialogSummary": "Se generarán {generate} y se omitirán {skip}.",
+        "groupDialogNote": "Solo se actualizarán los elementos indicados abajo. Los elementos con miniaturas personalizadas siempre se omiten.",
+        "cancel": "Cancelar",
+        "groupConfirm": "Generar",
+        "groupWillGenerate": "Se generará",
+        "groupSkipCustom": "Omitido: ya tiene miniatura personalizada",
+        "groupUnavailable": "Omitido: no se pudo verificar",
+        "groupNoTargets": "No hay miniaturas disponibles para generar en el grupo actual.",
+        "groupGenerating": "Generando miniaturas {current}/{total}…",
+        "groupComplete": "Completado: {success} correctas, {skip} omitidas y {failed} fallidas.",
         "versionTitle": "Versión de Spine",
         "reloadTitle": "Recargar carpeta",
         "animationList": "Lista de animaciones",
diff --git a/_locales/ja_JP.json b/_locales/ja_JP.json
index b81364d..574c0bf 100644
--- a/_locales/ja_JP.json
+++ b/_locales/ja_JP.json
@@ -20,6 +20,19 @@
         "backgroundTitle": "50×50 のチェッカー背景。キャンバスの移動・拡大に追従し、ブレンドモードにも参加します",
         "thumbnail": "現在の項目のサムネイルに設定",
         "thumbnailTitle": "現在のフレームをこの項目の 400×400 カスタムサムネイルに設定",
+        "groupThumbnail": "現在のアセットグループのサムネイルを生成…",
+        "groupThumbnailTitle": "現在の Spine アセットグループを確認して一括生成",
+        "groupDialogTitle": "現在のアセットグループのサムネイルを生成",
+        "groupDialogSummary": "{generate} 件を生成し、{skip} 件をスキップします。",
+        "groupDialogNote": "下に明示された項目だけを更新します。カスタムサムネイルがある項目は必ずスキップします。",
+        "cancel": "キャンセル",
+        "groupConfirm": "生成",
+        "groupWillGenerate": "生成対象",
+        "groupSkipCustom": "スキップ：カスタムサムネイルあり",
+        "groupUnavailable": "スキップ：検証できません",
+        "groupNoTargets": "現在のアセットグループに生成可能なサムネイルはありません。",
+        "groupGenerating": "アセットグループのサムネイルを生成中 {current}/{total}…",
+        "groupComplete": "完了：成功 {success}、スキップ {skip}、失敗 {failed}。",
         "versionTitle": "Spine バージョン",
         "reloadTitle": "フォルダーを再読み込み",
         "animationList": "アニメーション一覧",
diff --git a/_locales/ko_KR.json b/_locales/ko_KR.json
index 40dbb7a..4d86323 100644
--- a/_locales/ko_KR.json
+++ b/_locales/ko_KR.json
@@ -20,6 +20,19 @@
         "backgroundTitle": "50×50 체커 배경. 캔버스 이동·확대를 따라가며 블렌드 모드에도 참여합니다",
         "thumbnail": "현재 항목 썸네일로 설정",
         "thumbnailTitle": "현재 프레임을 이 항목의 400×400 사용자 지정 썸네일로 설정",
+        "groupThumbnail": "현재 자산 그룹 썸네일 생성…",
+        "groupThumbnailTitle": "현재 Spine 자산 그룹을 확인한 후 일괄 생성",
+        "groupDialogTitle": "현재 자산 그룹 썸네일 생성",
+        "groupDialogSummary": "{generate}개를 생성하고 {skip}개를 건너뜁니다.",
+        "groupDialogNote": "아래에 명시된 항목만 업데이트합니다. 기존 사용자 지정 썸네일이 있는 항목은 항상 건너뜁니다.",
+        "cancel": "취소",
+        "groupConfirm": "생성",
+        "groupWillGenerate": "생성 예정",
+        "groupSkipCustom": "건너뛰: 사용자 지정 썸네일 있음",
+        "groupUnavailable": "건너뛰: 확인할 수 없음",
+        "groupNoTargets": "현재 자산 그룹에 생성할 수 있는 썸네일이 없습니다.",
+        "groupGenerating": "자산 그룹 썸네일 생성 중 {current}/{total}…",
+        "groupComplete": "완료: 성공 {success}, 건너뛰 {skip}, 실패 {failed}.",
         "versionTitle": "Spine 버전",
         "reloadTitle": "폴더 다시 불러오기",
         "animationList": "애니메이션 목록",
diff --git a/_locales/ru_RU.json b/_locales/ru_RU.json
index cdda9be..6e0b32b 100644
--- a/_locales/ru_RU.json
+++ b/_locales/ru_RU.json
@@ -20,6 +20,19 @@
         "backgroundTitle": "Шахматный фон 50×50: следует за сдвигом и масштабом холста и участвует в режимах смешивания",
         "thumbnail": "Сделать миниатюрой элемента",
         "thumbnailTitle": "Установить текущий кадр как пользовательскую миниатюру 400×400 для этого элемента",
+        "groupThumbnail": "Создать миниатюры для текущей группы…",
+        "groupThumbnailTitle": "Проверить группу Spine и создать миниатюры пакетно",
+        "groupDialogTitle": "Создать миниатюры для текущей группы",
+        "groupDialogSummary": "Будет создано: {generate}; пропущено: {skip}.",
+        "groupDialogNote": "Будут обновлены только явно указанные ниже элементы. Элементы с пользовательскими миниатюрами всегда пропускаются.",
+        "cancel": "Отмена",
+        "groupConfirm": "Создать",
+        "groupWillGenerate": "Будет создано",
+        "groupSkipCustom": "Пропущено: есть своя миниатюра",
+        "groupUnavailable": "Пропущено: не удалось проверить",
+        "groupNoTargets": "В текущей группе нет подходящих миниатюр.",
+        "groupGenerating": "Создание миниатюр {current}/{total}…",
+        "groupComplete": "Готово: {success} успешно, {skip} пропущено, {failed} с ошибкой.",
         "versionTitle": "Версия Spine",
         "reloadTitle": "Перезагрузить папку",
         "animationList": "Список анимаций",
diff --git a/_locales/zh_CN.json b/_locales/zh_CN.json
index 45090c0..d019130 100644
--- a/_locales/zh_CN.json
+++ b/_locales/zh_CN.json
@@ -20,6 +20,19 @@
         "backgroundTitle": "50×50 方格背景，随画布移动和缩放，并参与混合模式",
         "thumbnail": "设为当前素材缩略图",
         "thumbnailTitle": "将当前帧设为当前素材的 400×400 自定义缩略图",
+        "groupThumbnail": "为当前资源组生成缩略图…",
+        "groupThumbnailTitle": "列出当前 Spine 资源组，确认后批量生成缩略图",
+        "groupDialogTitle": "为当前资源组生成缩略图",
+        "groupDialogSummary": "将生成 {generate} 项，跳过 {skip} 项。",
+        "groupDialogNote": "只会更新下列明确列出的素材；已有自定义缩略图的素材会自动跳过。",
+        "cancel": "取消",
+        "groupConfirm": "确认生成",
+        "groupWillGenerate": "将生成",
+        "groupSkipCustom": "跳过：已有自定义缩略图",
+        "groupUnavailable": "跳过：无法验证",
+        "groupNoTargets": "当前资源组没有可生成的缩略图。",
+        "groupGenerating": "正在生成资源组缩略图 {current}/{total}…",
+        "groupComplete": "资源组缩略图已完成：成功 {success}，跳过 {skip}，失败 {failed}。",
         "versionTitle": "Spine 版本",
         "reloadTitle": "重新加载目录",
         "animationList": "动画列表",
diff --git a/_locales/zh_TW.json b/_locales/zh_TW.json
index d8863f8..08395d6 100644
--- a/_locales/zh_TW.json
+++ b/_locales/zh_TW.json
@@ -20,6 +20,19 @@
         "backgroundTitle": "50×50 方格背景，隨畫布移動和縮放，並參與混合模式",
         "thumbnail": "設為目前素材縮圖",
         "thumbnailTitle": "將目前影格設為目前素材的 400×400 自訂縮圖",
+        "groupThumbnail": "為目前資源組產生縮圖…",
+        "groupThumbnailTitle": "列出目前 Spine 資源組，確認後批次產生縮圖",
+        "groupDialogTitle": "為目前資源組產生縮圖",
+        "groupDialogSummary": "將產生 {generate} 項，跳過 {skip} 項。",
+        "groupDialogNote": "只會更新下列明確列出的素材；已有自訂縮圖的素材會自動跳過。",
+        "cancel": "取消",
+        "groupConfirm": "確認產生",
+        "groupWillGenerate": "將產生",
+        "groupSkipCustom": "跳過：已有自訂縮圖",
+        "groupUnavailable": "跳過：無法驗證",
+        "groupNoTargets": "目前資源組沒有可產生的縮圖。",
+        "groupGenerating": "正在產生資源組縮圖 {current}/{total}…",
+        "groupComplete": "資源組縮圖已完成：成功 {success}，跳過 {skip}，失敗 {failed}。",
         "versionTitle": "Spine 版本",
         "reloadTitle": "重新載入目錄",
         "animationList": "動畫清單",
diff --git a/release/SpineViewer.eagleplugin b/release/SpineViewer.eagleplugin
index bafcd6e..9f26253 100644
Binary files a/release/SpineViewer.eagleplugin and b/release/SpineViewer.eagleplugin differ
diff --git a/release/UNIVERSAL_SpineViewer/README.md b/release/UNIVERSAL_SpineViewer/README.md
index c14782f..105d7b4 100644
--- a/release/UNIVERSAL_SpineViewer/README.md
+++ b/release/UNIVERSAL_SpineViewer/README.md
@@ -7,13 +7,13 @@ Eagle 的离线 Spine 骨骼动画预览插件，支持 Spine 3.4–4.3，适用
 1. 将同一套骨骼文件（`.skel` / `.skel.bytes` / Spine `.json`）、图集（`.atlas` / `.atlas.txt`）和配套贴图一起导入 Eagle，建议放在同一个 Eagle 文件夹内。
 2. 打开骨骼或图集文件即可预览动画，并可切换动画、皮肤、速度、循环、背景和 PMA。
 3. 插件不接管导入阶段的缩略图，由 Eagle 自身处理。
-4. 打开预览后，可点击“设为当前素材缩略图”，把当前帧手动设为当前素材的自定义缩略图。已有自定义缩略图时会先询问是否替换。
+4. 打开预览后，原有按钮可把当前帧设为当前素材的自定义缩略图。其左侧的“为当前资源组生成缩略图…”会先明确列出受影响的骨骼、atlas 和贴图，得到确认后才批量生成，并始终跳过已有自定义缩略图的素材。
 
 ## 安全与隐私
 
 - Atlas 贴图只允许安全的相对路径；绝对路径、`..`、盘符、UNC、URI 和越界符号链接会被拒绝。
 - 跨素材配对只使用当前 Eagle 素材库中已枚举并验证的文件。
-- 手动设置缩略图只作用于当前素材，不会自动改写其他素材。
+- 单素材按钮只作用于当前素材。资源组按钮会先列出全部受影响素材并要求确认，且不会覆盖已有自定义缩略图。
 
 ## 多语言
 
diff --git a/release/UNIVERSAL_SpineViewer/_locales/de_DE.json b/release/UNIVERSAL_SpineViewer/_locales/de_DE.json
index 4c49c1e..3f06cac 100644
--- a/release/UNIVERSAL_SpineViewer/_locales/de_DE.json
+++ b/release/UNIVERSAL_SpineViewer/_locales/de_DE.json
@@ -20,6 +20,19 @@
         "backgroundTitle": "50×50-Schachbrett, das mit der Leinwand verschoben und skaliert wird und an Blend-Modi teilnimmt",
         "thumbnail": "Als aktuelles Vorschaubild setzen",
         "thumbnailTitle": "Aktuellen Frame als benutzerdefiniertes 400×400-Vorschaubild dieses Elements setzen",
+        "groupThumbnail": "Vorschaubilder für aktuelle Ressourcengruppe erstellen…",
+        "groupThumbnailTitle": "Aktuelle Spine-Ressourcengruppe prüfen und Vorschaubilder gesammelt erstellen",
+        "groupDialogTitle": "Vorschaubilder für aktuelle Ressourcengruppe erstellen",
+        "groupDialogSummary": "{generate} werden erstellt, {skip} werden übersprungen.",
+        "groupDialogNote": "Nur die unten aufgeführten Elemente werden aktualisiert. Elemente mit eigenen Vorschaubildern werden immer übersprungen.",
+        "cancel": "Abbrechen",
+        "groupConfirm": "Erstellen",
+        "groupWillGenerate": "Wird erstellt",
+        "groupSkipCustom": "Übersprungen: eigenes Vorschaubild vorhanden",
+        "groupUnavailable": "Übersprungen: nicht verifizierbar",
+        "groupNoTargets": "In der aktuellen Ressourcengruppe gibt es keine geeigneten Vorschaubilder.",
+        "groupGenerating": "Vorschaubilder werden erstellt {current}/{total}…",
+        "groupComplete": "Fertig: {success} erfolgreich, {skip} übersprungen, {failed} fehlgeschlagen.",
         "versionTitle": "Spine-Version",
         "reloadTitle": "Ordner neu laden",
         "animationList": "Animationsliste",
diff --git a/release/UNIVERSAL_SpineViewer/_locales/en.json b/release/UNIVERSAL_SpineViewer/_locales/en.json
index 0d44342..de4fc86 100644
--- a/release/UNIVERSAL_SpineViewer/_locales/en.json
+++ b/release/UNIVERSAL_SpineViewer/_locales/en.json
@@ -20,6 +20,19 @@
         "backgroundTitle": "50×50 checkerboard that pans and zooms with the canvas and participates in blend modes",
         "thumbnail": "Set current item thumbnail",
         "thumbnailTitle": "Set the current frame as this item's 400×400 custom thumbnail",
+        "groupThumbnail": "Generate thumbnails for current asset group…",
+        "groupThumbnailTitle": "Review the current Spine asset group, then generate thumbnails in a batch",
+        "groupDialogTitle": "Generate thumbnails for current asset group",
+        "groupDialogSummary": "Generate {generate} item(s) and skip {skip} item(s).",
+        "groupDialogNote": "Only the items explicitly listed below will be updated. Items with existing custom thumbnails are always skipped.",
+        "cancel": "Cancel",
+        "groupConfirm": "Generate",
+        "groupWillGenerate": "Will generate",
+        "groupSkipCustom": "Skipped: custom thumbnail exists",
+        "groupUnavailable": "Skipped: could not verify",
+        "groupNoTargets": "There are no eligible thumbnails in the current asset group.",
+        "groupGenerating": "Generating asset-group thumbnails {current}/{total}…",
+        "groupComplete": "Asset-group thumbnails complete: {success} succeeded, {skip} skipped, {failed} failed.",
         "versionTitle": "Spine version",
         "reloadTitle": "Reload folder",
         "animationList": "Animation list",
diff --git a/release/UNIVERSAL_SpineViewer/_locales/es_ES.json b/release/UNIVERSAL_SpineViewer/_locales/es_ES.json
index fe13211..b0694fc 100644
--- a/release/UNIVERSAL_SpineViewer/_locales/es_ES.json
+++ b/release/UNIVERSAL_SpineViewer/_locales/es_ES.json
@@ -20,6 +20,19 @@
         "backgroundTitle": "Fondo de cuadros de 50×50 que se desplaza y escala con el lienzo y participa en los modos de fusión",
         "thumbnail": "Usar como miniatura actual",
         "thumbnailTitle": "Usar el fotograma actual como miniatura personalizada de 400×400 de este elemento",
+        "groupThumbnail": "Generar miniaturas del grupo actual…",
+        "groupThumbnailTitle": "Revisar el grupo de recursos Spine actual y generar miniaturas por lotes",
+        "groupDialogTitle": "Generar miniaturas del grupo actual",
+        "groupDialogSummary": "Se generarán {generate} y se omitirán {skip}.",
+        "groupDialogNote": "Solo se actualizarán los elementos indicados abajo. Los elementos con miniaturas personalizadas siempre se omiten.",
+        "cancel": "Cancelar",
+        "groupConfirm": "Generar",
+        "groupWillGenerate": "Se generará",
+        "groupSkipCustom": "Omitido: ya tiene miniatura personalizada",
+        "groupUnavailable": "Omitido: no se pudo verificar",
+        "groupNoTargets": "No hay miniaturas disponibles para generar en el grupo actual.",
+        "groupGenerating": "Generando miniaturas {current}/{total}…",
+        "groupComplete": "Completado: {success} correctas, {skip} omitidas y {failed} fallidas.",
         "versionTitle": "Versión de Spine",
         "reloadTitle": "Recargar carpeta",
         "animationList": "Lista de animaciones",
diff --git a/release/UNIVERSAL_SpineViewer/_locales/ja_JP.json b/release/UNIVERSAL_SpineViewer/_locales/ja_JP.json
index b81364d..574c0bf 100644
--- a/release/UNIVERSAL_SpineViewer/_locales/ja_JP.json
+++ b/release/UNIVERSAL_SpineViewer/_locales/ja_JP.json
@@ -20,6 +20,19 @@
         "backgroundTitle": "50×50 のチェッカー背景。キャンバスの移動・拡大に追従し、ブレンドモードにも参加します",
         "thumbnail": "現在の項目のサムネイルに設定",
         "thumbnailTitle": "現在のフレームをこの項目の 400×400 カスタムサムネイルに設定",
+        "groupThumbnail": "現在のアセットグループのサムネイルを生成…",
+        "groupThumbnailTitle": "現在の Spine アセットグループを確認して一括生成",
+        "groupDialogTitle": "現在のアセットグループのサムネイルを生成",
+        "groupDialogSummary": "{generate} 件を生成し、{skip} 件をスキップします。",
+        "groupDialogNote": "下に明示された項目だけを更新します。カスタムサムネイルがある項目は必ずスキップします。",
+        "cancel": "キャンセル",
+        "groupConfirm": "生成",
+        "groupWillGenerate": "生成対象",
+        "groupSkipCustom": "スキップ：カスタムサムネイルあり",
+        "groupUnavailable": "スキップ：検証できません",
+        "groupNoTargets": "現在のアセットグループに生成可能なサムネイルはありません。",
+        "groupGenerating": "アセットグループのサムネイルを生成中 {current}/{total}…",
+        "groupComplete": "完了：成功 {success}、スキップ {skip}、失敗 {failed}。",
         "versionTitle": "Spine バージョン",
         "reloadTitle": "フォルダーを再読み込み",
         "animationList": "アニメーション一覧",
diff --git a/release/UNIVERSAL_SpineViewer/_locales/ko_KR.json b/release/UNIVERSAL_SpineViewer/_locales/ko_KR.json
index 40dbb7a..4d86323 100644
--- a/release/UNIVERSAL_SpineViewer/_locales/ko_KR.json
+++ b/release/UNIVERSAL_SpineViewer/_locales/ko_KR.json
@@ -20,6 +20,19 @@
         "backgroundTitle": "50×50 체커 배경. 캔버스 이동·확대를 따라가며 블렌드 모드에도 참여합니다",
         "thumbnail": "현재 항목 썸네일로 설정",
         "thumbnailTitle": "현재 프레임을 이 항목의 400×400 사용자 지정 썸네일로 설정",
+        "groupThumbnail": "현재 자산 그룹 썸네일 생성…",
+        "groupThumbnailTitle": "현재 Spine 자산 그룹을 확인한 후 일괄 생성",
+        "groupDialogTitle": "현재 자산 그룹 썸네일 생성",
+        "groupDialogSummary": "{generate}개를 생성하고 {skip}개를 건너뜁니다.",
+        "groupDialogNote": "아래에 명시된 항목만 업데이트합니다. 기존 사용자 지정 썸네일이 있는 항목은 항상 건너뜁니다.",
+        "cancel": "취소",
+        "groupConfirm": "생성",
+        "groupWillGenerate": "생성 예정",
+        "groupSkipCustom": "건너뛰: 사용자 지정 썸네일 있음",
+        "groupUnavailable": "건너뛰: 확인할 수 없음",
+        "groupNoTargets": "현재 자산 그룹에 생성할 수 있는 썸네일이 없습니다.",
+        "groupGenerating": "자산 그룹 썸네일 생성 중 {current}/{total}…",
+        "groupComplete": "완료: 성공 {success}, 건너뛰 {skip}, 실패 {failed}.",
         "versionTitle": "Spine 버전",
         "reloadTitle": "폴더 다시 불러오기",
         "animationList": "애니메이션 목록",
diff --git a/release/UNIVERSAL_SpineViewer/_locales/ru_RU.json b/release/UNIVERSAL_SpineViewer/_locales/ru_RU.json
index cdda9be..6e0b32b 100644
--- a/release/UNIVERSAL_SpineViewer/_locales/ru_RU.json
+++ b/release/UNIVERSAL_SpineViewer/_locales/ru_RU.json
@@ -20,6 +20,19 @@
         "backgroundTitle": "Шахматный фон 50×50: следует за сдвигом и масштабом холста и участвует в режимах смешивания",
         "thumbnail": "Сделать миниатюрой элемента",
         "thumbnailTitle": "Установить текущий кадр как пользовательскую миниатюру 400×400 для этого элемента",
+        "groupThumbnail": "Создать миниатюры для текущей группы…",
+        "groupThumbnailTitle": "Проверить группу Spine и создать миниатюры пакетно",
+        "groupDialogTitle": "Создать миниатюры для текущей группы",
+        "groupDialogSummary": "Будет создано: {generate}; пропущено: {skip}.",
+        "groupDialogNote": "Будут обновлены только явно указанные ниже элементы. Элементы с пользовательскими миниатюрами всегда пропускаются.",
+        "cancel": "Отмена",
+        "groupConfirm": "Создать",
+        "groupWillGenerate": "Будет создано",
+        "groupSkipCustom": "Пропущено: есть своя миниатюра",
+        "groupUnavailable": "Пропущено: не удалось проверить",
+        "groupNoTargets": "В текущей группе нет подходящих миниатюр.",
+        "groupGenerating": "Создание миниатюр {current}/{total}…",
+        "groupComplete": "Готово: {success} успешно, {skip} пропущено, {failed} с ошибкой.",
         "versionTitle": "Версия Spine",
         "reloadTitle": "Перезагрузить папку",
         "animationList": "Список анимаций",
diff --git a/release/UNIVERSAL_SpineViewer/_locales/zh_CN.json b/release/UNIVERSAL_SpineViewer/_locales/zh_CN.json
index 45090c0..d019130 100644
--- a/release/UNIVERSAL_SpineViewer/_locales/zh_CN.json
+++ b/release/UNIVERSAL_SpineViewer/_locales/zh_CN.json
@@ -20,6 +20,19 @@
         "backgroundTitle": "50×50 方格背景，随画布移动和缩放，并参与混合模式",
         "thumbnail": "设为当前素材缩略图",
         "thumbnailTitle": "将当前帧设为当前素材的 400×400 自定义缩略图",
+        "groupThumbnail": "为当前资源组生成缩略图…",
+        "groupThumbnailTitle": "列出当前 Spine 资源组，确认后批量生成缩略图",
+        "groupDialogTitle": "为当前资源组生成缩略图",
+        "groupDialogSummary": "将生成 {generate} 项，跳过 {skip} 项。",
+        "groupDialogNote": "只会更新下列明确列出的素材；已有自定义缩略图的素材会自动跳过。",
+        "cancel": "取消",
+        "groupConfirm": "确认生成",
+        "groupWillGenerate": "将生成",
+        "groupSkipCustom": "跳过：已有自定义缩略图",
+        "groupUnavailable": "跳过：无法验证",
+        "groupNoTargets": "当前资源组没有可生成的缩略图。",
+        "groupGenerating": "正在生成资源组缩略图 {current}/{total}…",
+        "groupComplete": "资源组缩略图已完成：成功 {success}，跳过 {skip}，失败 {failed}。",
         "versionTitle": "Spine 版本",
         "reloadTitle": "重新加载目录",
         "animationList": "动画列表",
diff --git a/release/UNIVERSAL_SpineViewer/_locales/zh_TW.json b/release/UNIVERSAL_SpineViewer/_locales/zh_TW.json
index d8863f8..08395d6 100644
--- a/release/UNIVERSAL_SpineViewer/_locales/zh_TW.json
+++ b/release/UNIVERSAL_SpineViewer/_locales/zh_TW.json
@@ -20,6 +20,19 @@
         "backgroundTitle": "50×50 方格背景，隨畫布移動和縮放，並參與混合模式",
         "thumbnail": "設為目前素材縮圖",
         "thumbnailTitle": "將目前影格設為目前素材的 400×400 自訂縮圖",
+        "groupThumbnail": "為目前資源組產生縮圖…",
+        "groupThumbnailTitle": "列出目前 Spine 資源組，確認後批次產生縮圖",
+        "groupDialogTitle": "為目前資源組產生縮圖",
+        "groupDialogSummary": "將產生 {generate} 項，跳過 {skip} 項。",
+        "groupDialogNote": "只會更新下列明確列出的素材；已有自訂縮圖的素材會自動跳過。",
+        "cancel": "取消",
+        "groupConfirm": "確認產生",
+        "groupWillGenerate": "將產生",
+        "groupSkipCustom": "跳過：已有自訂縮圖",
+        "groupUnavailable": "跳過：無法驗證",
+        "groupNoTargets": "目前資源組沒有可產生的縮圖。",
+        "groupGenerating": "正在產生資源組縮圖 {current}/{total}…",
+        "groupComplete": "資源組縮圖已完成：成功 {success}，跳過 {skip}，失敗 {failed}。",
         "versionTitle": "Spine 版本",
         "reloadTitle": "重新載入目錄",
         "animationList": "動畫清單",
diff --git a/release/UNIVERSAL_SpineViewer/viewer/spine.css b/release/UNIVERSAL_SpineViewer/viewer/spine.css
index 621d931..6bc7685 100644
--- a/release/UNIVERSAL_SpineViewer/viewer/spine.css
+++ b/release/UNIVERSAL_SpineViewer/viewer/spine.css
@@ -75,6 +75,36 @@
 		}
 		button:hover { background: var(--border); }
 		button.active { background: var(--accent); color: #fff; border-color: var(--accent); }
+		button.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
+		button:disabled { cursor: default; opacity: .55; }
+		.thumb-dialog {
+			position: absolute; inset: 0; z-index: 40; display: flex;
+			align-items: center; justify-content: center; padding: 24px;
+			background: rgba(0, 0, 0, .58);
+		}
+		.thumb-dialog.hidden { display: none; }
+		.thumb-dialog-card {
+			width: min(620px, 92vw); max-height: min(680px, 88vh); display: flex;
+			flex-direction: column; gap: 12px; padding: 18px;
+			background: var(--panel); border: 1px solid var(--border); border-radius: 10px;
+			box-shadow: 0 16px 48px rgba(0, 0, 0, .45);
+		}
+		.thumb-dialog-title { font-size: 16px; font-weight: 600; }
+		.thumb-dialog-summary, .thumb-dialog-note { color: var(--text-dim); line-height: 1.5; }
+		.thumb-dialog-list {
+			min-height: 60px; overflow: auto; border: 1px solid var(--border);
+			border-radius: 6px; background: var(--bg);
+		}
+		.thumb-dialog-row {
+			display: flex; align-items: center; gap: 10px; padding: 8px 10px;
+			border-bottom: 1px solid var(--border);
+		}
+		.thumb-dialog-row:last-child { border-bottom: 0; }
+		.thumb-dialog-name { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+		.thumb-dialog-state { flex: none; color: var(--accent); font-size: 12px; }
+		.thumb-dialog-row.skipped .thumb-dialog-name,
+		.thumb-dialog-row.skipped .thumb-dialog-state { color: var(--text-dim); }
+		.thumb-dialog-actions { display: flex; justify-content: flex-end; gap: 8px; }
 		#stage { position: absolute; inset: 0; display: flex; overflow: hidden; }
 		#animationPanel {
 			position: absolute;
diff --git a/release/UNIVERSAL_SpineViewer/viewer/spine.html b/release/UNIVERSAL_SpineViewer/viewer/spine.html
index 93a1acc..232015c 100644
--- a/release/UNIVERSAL_SpineViewer/viewer/spine.html
+++ b/release/UNIVERSAL_SpineViewer/viewer/spine.html
@@ -25,6 +25,7 @@
 			<input type="checkbox" id="backgroundCheck"> <span data-i18n="viewer.background">背景</span>
 		</label>
 		<div class="spacer"></div>
+		<button id="groupThumbBtn" data-i18n="viewer.groupThumbnail" data-i18n-title="viewer.groupThumbnailTitle" title="为当前资源组生成缩略图">为当前资源组生成缩略图…</button>
 		<button id="thumbBtn" data-i18n="viewer.thumbnail" data-i18n-title="viewer.thumbnailTitle" title="将当前帧设为当前素材的缩略图">设为当前素材缩略图</button>
 		<label id="verLabel" style="color: var(--text-dim);" data-i18n-title="viewer.versionTitle" title="Spine 版本"></label>
 		<button id="reloadBtn" title="重新加载目录" data-i18n-title="viewer.reloadTitle">↻</button>
@@ -58,6 +59,18 @@
 		</div>
 		<span id="timeLabel" data-i18n="viewer.timePlaceholder">0.00 / 0.00 秒 · 0 / 0 帧</span>
 	</div>
+	<div id="thumbDialog" class="thumb-dialog hidden" role="dialog" aria-modal="true" aria-labelledby="thumbDialogTitle">
+		<div class="thumb-dialog-card">
+			<div id="thumbDialogTitle" class="thumb-dialog-title" data-i18n="viewer.groupDialogTitle">为当前资源组生成缩略图</div>
+			<div id="thumbDialogSummary" class="thumb-dialog-summary"></div>
+			<div id="thumbDialogList" class="thumb-dialog-list"></div>
+			<div class="thumb-dialog-note" data-i18n="viewer.groupDialogNote">只会更新下列明确列出的素材；已有自定义缩略图的素材会自动跳过。</div>
+			<div class="thumb-dialog-actions">
+				<button id="thumbDialogCancel" data-i18n="viewer.cancel">取消</button>
+				<button id="thumbDialogConfirm" class="primary" data-i18n="viewer.groupConfirm">确认生成</button>
+			</div>
+		</div>
+	</div>
 </div>
 
 <script>
@@ -215,6 +228,7 @@
 
 	// ---------- 全局状态 ----------
 	let skeleton = null, state = null, stateData = null, skeletonData = null;
+	let activeAssets = null;
 	let renderer = null;
 	let activeRuntimeDir = null;
 	let activeVersion = null;
@@ -482,19 +496,26 @@
 		return match ? match[1] : null;
 	}
 
-	async function getCurrentEagleItem() {
-		const pathItemId = eagleItemIdFromPath(filePath);
-		const urlItemId = urlParams.get('id');
-		if (!pathItemId || (urlItemId && urlItemId !== pathItemId)) throw new Error(t('viewer.itemMismatch'));
-		const response = await fetch('http://localhost:41595/api/item/info?id=' + encodeURIComponent(pathItemId));
+	async function getEagleItemForPath(sourcePath) {
+		const itemId = eagleItemIdFromPath(sourcePath);
+		if (!itemId || !/^[A-Za-z0-9_-]+$/.test(itemId)) throw new Error(t('viewer.itemMismatch'));
+		const currentLibrary = utils.findLibraryRoot(filePath);
+		const itemLibrary = utils.findLibraryRoot(sourcePath);
+		if (!currentLibrary || !itemLibrary || path.resolve(currentLibrary) !== path.resolve(itemLibrary)) {
+			throw new Error(t('viewer.itemMismatch'));
+		}
+		if (sourcePath === filePath) {
+			const urlItemId = urlParams.get('id');
+			if (urlItemId && urlItemId !== itemId) throw new Error(t('viewer.itemMismatch'));
+		}
+		const response = await fetch('http://localhost:41595/api/item/info?id=' + encodeURIComponent(itemId));
 		let result = null;
 		try { result = await response.json(); } catch (e) { /* use HTTP status below */ }
 		if (!response.ok || !result || result.status !== 'success' || !result.data) {
 			throw new Error(t('viewer.apiHttp', { status: response.status }));
 		}
-		if (result.data.name + '.' + result.data.ext !== path.basename(filePath)) throw new Error(t('viewer.itemMismatch'));
-		if (result.data.ext === 'txt' && /\.atlas\.txt$/i.test(filePath)) throw new Error(t('viewer.txtRegistered'));
-		return { id: pathItemId, data: result.data };
+		if (result.data.name + '.' + result.data.ext !== path.basename(sourcePath)) throw new Error(t('viewer.itemMismatch'));
+		return { id: itemId, data: result.data, sourcePath };
 	}
 
 	async function setEagleCustomThumbnail(itemId, thumbnailPath) {
@@ -512,71 +533,183 @@
 		return result;
 	}
 
+	function currentResourcePaths() {
+		if (!activeAssets) return [];
+		return [...new Set([
+			activeAssets.skeletonPath,
+			activeAssets.atlasPath,
+			...Object.values(activeAssets.texturePaths || {}),
+		].filter(Boolean).map((file) => path.resolve(file)))];
+	}
+
+	async function collectGroupThumbnailItems() {
+		const rows = [];
+		for (const sourcePath of currentResourcePaths()) {
+			try {
+				const item = await getEagleItemForPath(sourcePath);
+				rows.push({
+					...item,
+					name: path.basename(sourcePath),
+					state: item.data.customThumbnail === true ? 'custom' : 'ready',
+				});
+			} catch (error) {
+				rows.push({ sourcePath, name: path.basename(sourcePath), state: 'unavailable', error });
+			}
+		}
+		return rows;
+	}
+
+	function confirmGroupThumbnail(rows) {
+		const dialog = document.getElementById('thumbDialog');
+		const list = document.getElementById('thumbDialogList');
+		const confirm = document.getElementById('thumbDialogConfirm');
+		const cancel = document.getElementById('thumbDialogCancel');
+		const ready = rows.filter((row) => row.state === 'ready');
+		const skipped = rows.length - ready.length;
+		document.getElementById('thumbDialogSummary').textContent = t('viewer.groupDialogSummary', {
+			generate: ready.length,
+			skip: skipped,
+		});
+		list.textContent = '';
+		for (const row of rows) {
+			const entry = document.createElement('div');
+			entry.className = 'thumb-dialog-row' + (row.state === 'ready' ? '' : ' skipped');
+			const name = document.createElement('span');
+			name.className = 'thumb-dialog-name';
+			name.textContent = row.name;
+			name.title = row.sourcePath;
+			const state = document.createElement('span');
+			state.className = 'thumb-dialog-state';
+			state.textContent = t(row.state === 'ready' ? 'viewer.groupWillGenerate'
+				: row.state === 'custom' ? 'viewer.groupSkipCustom' : 'viewer.groupUnavailable');
+			entry.append(name, state);
+			list.appendChild(entry);
+		}
+		confirm.disabled = ready.length === 0;
+		dialog.classList.remove('hidden');
+		return new Promise((resolve) => {
+			const finish = (accepted) => {
+				dialog.classList.add('hidden');
+				confirm.removeEventListener('click', accept);
+				cancel.removeEventListener('click', reject);
+				document.removeEventListener('keydown', keydown);
+				resolve(accepted ? ready : []);
+			};
+			const accept = () => finish(true);
+			const reject = () => finish(false);
+			const keydown = (event) => { if (event.key === 'Escape') reject(); };
+			confirm.addEventListener('click', accept);
+			cancel.addEventListener('click', reject);
+			document.addEventListener('keydown', keydown);
+			cancel.focus();
+		});
+	}
+
+	async function renderCurrentFrameThumbnail() {
+		playing = false;
+		updatePlayButton();
+		if (state) state.apply(skeleton);
+		updateWorld(skeleton);
+
+		const size = 400;
+		const bounds = getBounds(skeleton);
+		const off = document.createElement('canvas');
+		off.width = size; off.height = size;
+		const octx = off.getContext('2d');
+		octx.fillStyle = '#1e1e1e';
+		octx.fillRect(0, 0, size, size);
+		if (bounds && bounds.width > 0 && bounds.height > 0) {
+			const pad = 0.1;
+			const scale = Math.min((size * (1 - pad * 2)) / bounds.width, (size * (1 - pad * 2)) / bounds.height);
+			const cx = bounds.x + bounds.width / 2;
+			const cy = bounds.y + bounds.height / 2;
+			octx.save();
+			octx.translate(size / 2, size / 2);
+			octx.scale(scale, -scale);
+			octx.translate(-cx, -cy);
+			if (document.getElementById('backgroundCheck').checked) require('../js/spine-background.js').drawCheckerboard(octx, size, size);
+			let offRenderer = null;
+			try {
+				offRenderer = clippingRenderer.createRenderer(spine, octx, activeRuntimeDir);
+				offRenderer.premultipliedAlpha = premultipliedAlpha;
+				offRenderer.draw(skeleton);
+			} finally {
+				if (offRenderer && offRenderer.dispose) offRenderer.dispose();
+				octx.restore();
+			}
+		}
+		await drawSpineBadge(octx, size, size);
+		require('../js/spine-badge.js').drawVersion(octx, size, size, skeletonData.version || activeVersion);
+		let out = off.toDataURL('image/webp', 0.9);
+		const isWebp = out.startsWith('data:image/webp');
+		if (!isWebp) out = off.toDataURL('image/png');
+		return { buffer: Buffer.from(out.split(',')[1], 'base64'), extension: isWebp ? '.webp' : '.png' };
+	}
+
+	async function generateGroupThumbnails() {
+		if (!skeleton || !renderer || !activeAssets) { setStatus(t('viewer.noSkeletonForThumb')); return; }
+		const groupThumbBtn = document.getElementById('groupThumbBtn');
+		groupThumbBtn.disabled = true;
+		let tempPath = null;
+		try {
+			const rows = await collectGroupThumbnailItems();
+			const targets = await confirmGroupThumbnail(rows);
+			if (targets.length === 0) {
+				if (rows.length && rows.every((row) => row.state !== 'ready')) setStatus(t('viewer.groupNoTargets'), 4000);
+				return;
+			}
+			setStatus(t('viewer.generating'), Infinity);
+			const rendered = await renderCurrentFrameThumbnail();
+			tempPath = path.join(os.tmpdir(), 'spineviewer-group-' + crypto.randomBytes(12).toString('hex') + rendered.extension);
+			fs.writeFileSync(tempPath, rendered.buffer);
+			let success = 0, skipped = rows.filter((row) => row.state !== 'ready').length, failed = 0;
+			for (let index = 0; index < targets.length; index++) {
+				setStatus(t('viewer.groupGenerating', { current: index + 1, total: targets.length }), Infinity);
+				try {
+					// 确认后再读一次，避免在对话框打开期间覆盖用户新设的缩略图。
+					const fresh = await getEagleItemForPath(targets[index].sourcePath);
+					if (fresh.data.customThumbnail === true) { skipped++; continue; }
+					await setEagleCustomThumbnail(fresh.id, tempPath);
+					success++;
+					log('用户确认批量更新资源组缩略图: item=' + fresh.id);
+				} catch (error) {
+					failed++;
+					log('资源组缩略图失败: ' + ((error && error.stack) || error));
+				}
+			}
+			setStatus(t('viewer.groupComplete', { success, skip: skipped, failed }), 6000);
+		} catch (e) {
+			setStatus(t('viewer.thumbnailFailed', { error: (e && e.message) || String(e) }), 6000);
+			log('生成当前资源组缩略图失败: ' + ((e && e.stack) || e));
+		} finally {
+			try { if (tempPath && fs.existsSync(tempPath)) fs.unlinkSync(tempPath); } catch (e) { /* ignore */ }
+			groupThumbBtn.disabled = false;
+		}
+	}
+
 	async function generateThumbnail() {
 		if (!skeleton || !renderer) { setStatus(t('viewer.noSkeletonForThumb')); return; }
 		const thumbBtn = document.getElementById('thumbBtn');
 		thumbBtn.disabled = true;
+		let tempPath = null;
 		try {
-			const currentItem = await getCurrentEagleItem();
+			const currentItem = await getEagleItemForPath(filePath);
 			if (currentItem.data.customThumbnail === true && !window.confirm(t('viewer.replaceCustomThumbnailConfirm'))) return;
 			setStatus(t('viewer.generating'), Infinity);
-			// 暂停动画，冻结当前帧：先确保当前动画时间已被应用到骨骼
-			playing = false;
-			updatePlayButton();
-			if (state) state.apply(skeleton);
-			updateWorld(skeleton);
-
-			const size = 400;
-			const bounds = getBounds(skeleton);
-			const off = document.createElement('canvas');
-			off.width = size; off.height = size;
-			const octx = off.getContext('2d');
-			octx.fillStyle = '#1e1e1e';
-			octx.fillRect(0, 0, size, size);
-
-			if (bounds && bounds.width > 0 && bounds.height > 0) {
-				const pad = 0.1;
-				const scale = Math.min((size * (1 - pad * 2)) / bounds.width, (size * (1 - pad * 2)) / bounds.height);
-				const cx = bounds.x + bounds.width / 2;
-				const cy = bounds.y + bounds.height / 2;
-				octx.save();
-				octx.translate(size / 2, size / 2);
-				octx.scale(scale, -scale);
-				octx.translate(-cx, -cy);
-				if (document.getElementById('backgroundCheck').checked) require('../js/spine-background.js').drawCheckerboard(octx, size, size);
-				let offRenderer = null;
-				try {
-					offRenderer = clippingRenderer.createRenderer(spine, octx, activeRuntimeDir);
-					offRenderer.premultipliedAlpha = premultipliedAlpha;
-					offRenderer.draw(skeleton);
-				} finally {
-					if (offRenderer && offRenderer.dispose) offRenderer.dispose();
-					octx.restore();
-				}
-			}
-			await drawSpineBadge(octx, size, size);
-			require('../js/spine-badge.js').drawVersion(octx, size, size, skeletonData.version || activeVersion);
-
-			// Eagle 的 *_thumbnail.png 通常实际保存 WebP；优先使用 WebP 显著减小体积。
-			let out = off.toDataURL('image/webp', 0.9);
-			const isWebp = out.startsWith('data:image/webp');
-			if (!isWebp) out = off.toDataURL('image/png');
-			const buf = Buffer.from(out.split(',')[1], 'base64');
-			const tempPath = path.join(os.tmpdir(), 'spineviewer-current-' + crypto.randomBytes(12).toString('hex') + (isWebp ? '.webp' : '.png'));
-			try {
-				fs.writeFileSync(tempPath, buf);
-				await setEagleCustomThumbnail(currentItem.id, tempPath);
-				setStatus(t('viewer.thumbUpdated', { format: isWebp ? 'WebP' : 'PNG', size: (buf.length / 1024).toFixed(1) }), 3500);
-				log('用户主动更新当前素材缩略图: item=' + currentItem.id + ' (' + buf.length + 'B)');
-			} catch (e) {
-				setStatus(t('viewer.thumbnailFailed', { error: (e && e.message) || String(e) }), 6000);
-			} finally {
-				try { if (fs.existsSync(tempPath)) fs.unlinkSync(tempPath); } catch (e) { /* ignore */ }
-			}
+			const rendered = await renderCurrentFrameThumbnail();
+			tempPath = path.join(os.tmpdir(), 'spineviewer-current-' + crypto.randomBytes(12).toString('hex') + rendered.extension);
+			fs.writeFileSync(tempPath, rendered.buffer);
+			await setEagleCustomThumbnail(currentItem.id, tempPath);
+			setStatus(t('viewer.thumbUpdated', {
+				format: rendered.extension === '.webp' ? 'WebP' : 'PNG',
+				size: (rendered.buffer.length / 1024).toFixed(1),
+			}), 3500);
+			log('用户主动更新当前素材缩略图: item=' + currentItem.id);
 		} catch (e) {
 			setStatus(t('viewer.thumbnailFailed', { error: (e && e.message) || String(e) }), 6000);
-			log('生成当前帧缩略图失败: ' + ((e && e.stack) || e));
+			log('生成当前素材缩略图失败: ' + ((e && e.stack) || e));
 		} finally {
+			try { if (tempPath && fs.existsSync(tempPath)) fs.unlinkSync(tempPath); } catch (e) { /* ignore */ }
 			thumbBtn.disabled = false;
 		}
 	}
@@ -925,6 +1058,7 @@
 
 	// ---------- 加载资源并与运行时交互 ----------
 	async function loadAssets() {
+		activeAssets = null;
 		if (!utils.extOf(path.basename(filePath))) {
 			// Registering txt/bytes is required by Eagle's extension dispatch.
 			// Ordinary text remains readable and never starts Spine discovery.
@@ -970,6 +1104,7 @@
 			}
 			return;
 		}
+		activeAssets = assets;
 		let savedPma;
 		try {
 			const settings = require('../js/spine-preview-settings.js');
@@ -1131,6 +1266,7 @@
 	document.getElementById('reloadBtn').addEventListener('click', () => {
 		window.location.reload();
 	});
+	document.getElementById('groupThumbBtn').addEventListener('click', generateGroupThumbnails);
 	document.getElementById('thumbBtn').addEventListener('click', generateThumbnail);
 	function seekTimelineToNearestFrame() {
 		const snappedTime = snapTimeToFrame(parseFloat(timeline.value));
diff --git a/tests/security-privacy.test.js b/tests/security-privacy.test.js
index bead443..06e26d5 100644
--- a/tests/security-privacy.test.js
+++ b/tests/security-privacy.test.js
@@ -71,6 +71,9 @@ try {
 	assert.equal(fs.existsSync(path.join(__dirname, '../js/spine-reconcile-worker.js')), false);
 	const viewerSource = fs.readFileSync(path.join(__dirname, '../viewer/spine.html'), 'utf8');
 	assert.match(viewerSource, /currentItem\.data\.customThumbnail === true && !window\.confirm/);
+	assert.match(viewerSource, /activeAssets\.skeletonPath[\s\S]*activeAssets\.atlasPath[\s\S]*Object\.values\(activeAssets\.texturePaths/);
+	assert.match(viewerSource, /fresh\.data\.customThumbnail === true\) \{ skipped\+\+; continue; \}[\s\S]*setEagleCustomThumbnail\(fresh\.id/);
+	assert.match(viewerSource, /groupThumbBtn[\s\S]*thumbBtn/);
 	assert.match(viewerSource, /path\.join\(os\.tmpdir\(\), 'spineviewer-current-'/);
 	assert.doesNotMatch(viewerSource, /fs\.writeFileSync\(outPath/);
 	console.log('PASS: atlas path boundaries, validated Eagle pairing, no import thumbnail handler, and manual current-item confirmation');
diff --git a/viewer/spine.css b/viewer/spine.css
index 621d931..6bc7685 100644
--- a/viewer/spine.css
+++ b/viewer/spine.css
@@ -75,6 +75,36 @@
 		}
 		button:hover { background: var(--border); }
 		button.active { background: var(--accent); color: #fff; border-color: var(--accent); }
+		button.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
+		button:disabled { cursor: default; opacity: .55; }
+		.thumb-dialog {
+			position: absolute; inset: 0; z-index: 40; display: flex;
+			align-items: center; justify-content: center; padding: 24px;
+			background: rgba(0, 0, 0, .58);
+		}
+		.thumb-dialog.hidden { display: none; }
+		.thumb-dialog-card {
+			width: min(620px, 92vw); max-height: min(680px, 88vh); display: flex;
+			flex-direction: column; gap: 12px; padding: 18px;
+			background: var(--panel); border: 1px solid var(--border); border-radius: 10px;
+			box-shadow: 0 16px 48px rgba(0, 0, 0, .45);
+		}
+		.thumb-dialog-title { font-size: 16px; font-weight: 600; }
+		.thumb-dialog-summary, .thumb-dialog-note { color: var(--text-dim); line-height: 1.5; }
+		.thumb-dialog-list {
+			min-height: 60px; overflow: auto; border: 1px solid var(--border);
+			border-radius: 6px; background: var(--bg);
+		}
+		.thumb-dialog-row {
+			display: flex; align-items: center; gap: 10px; padding: 8px 10px;
+			border-bottom: 1px solid var(--border);
+		}
+		.thumb-dialog-row:last-child { border-bottom: 0; }
+		.thumb-dialog-name { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+		.thumb-dialog-state { flex: none; color: var(--accent); font-size: 12px; }
+		.thumb-dialog-row.skipped .thumb-dialog-name,
+		.thumb-dialog-row.skipped .thumb-dialog-state { color: var(--text-dim); }
+		.thumb-dialog-actions { display: flex; justify-content: flex-end; gap: 8px; }
 		#stage { position: absolute; inset: 0; display: flex; overflow: hidden; }
 		#animationPanel {
 			position: absolute;
diff --git a/viewer/spine.html b/viewer/spine.html
index 93a1acc..232015c 100644
--- a/viewer/spine.html
+++ b/viewer/spine.html
@@ -25,6 +25,7 @@
 			<input type="checkbox" id="backgroundCheck"> <span data-i18n="viewer.background">背景</span>
 		</label>
 		<div class="spacer"></div>
+		<button id="groupThumbBtn" data-i18n="viewer.groupThumbnail" data-i18n-title="viewer.groupThumbnailTitle" title="为当前资源组生成缩略图">为当前资源组生成缩略图…</button>
 		<button id="thumbBtn" data-i18n="viewer.thumbnail" data-i18n-title="viewer.thumbnailTitle" title="将当前帧设为当前素材的缩略图">设为当前素材缩略图</button>
 		<label id="verLabel" style="color: var(--text-dim);" data-i18n-title="viewer.versionTitle" title="Spine 版本"></label>
 		<button id="reloadBtn" title="重新加载目录" data-i18n-title="viewer.reloadTitle">↻</button>
@@ -58,6 +59,18 @@
 		</div>
 		<span id="timeLabel" data-i18n="viewer.timePlaceholder">0.00 / 0.00 秒 · 0 / 0 帧</span>
 	</div>
+	<div id="thumbDialog" class="thumb-dialog hidden" role="dialog" aria-modal="true" aria-labelledby="thumbDialogTitle">
+		<div class="thumb-dialog-card">
+			<div id="thumbDialogTitle" class="thumb-dialog-title" data-i18n="viewer.groupDialogTitle">为当前资源组生成缩略图</div>
+			<div id="thumbDialogSummary" class="thumb-dialog-summary"></div>
+			<div id="thumbDialogList" class="thumb-dialog-list"></div>
+			<div class="thumb-dialog-note" data-i18n="viewer.groupDialogNote">只会更新下列明确列出的素材；已有自定义缩略图的素材会自动跳过。</div>
+			<div class="thumb-dialog-actions">
+				<button id="thumbDialogCancel" data-i18n="viewer.cancel">取消</button>
+				<button id="thumbDialogConfirm" class="primary" data-i18n="viewer.groupConfirm">确认生成</button>
+			</div>
+		</div>
+	</div>
 </div>
 
 <script>
@@ -215,6 +228,7 @@
 
 	// ---------- 全局状态 ----------
 	let skeleton = null, state = null, stateData = null, skeletonData = null;
+	let activeAssets = null;
 	let renderer = null;
 	let activeRuntimeDir = null;
 	let activeVersion = null;
@@ -482,19 +496,26 @@
 		return match ? match[1] : null;
 	}
 
-	async function getCurrentEagleItem() {
-		const pathItemId = eagleItemIdFromPath(filePath);
-		const urlItemId = urlParams.get('id');
-		if (!pathItemId || (urlItemId && urlItemId !== pathItemId)) throw new Error(t('viewer.itemMismatch'));
-		const response = await fetch('http://localhost:41595/api/item/info?id=' + encodeURIComponent(pathItemId));
+	async function getEagleItemForPath(sourcePath) {
+		const itemId = eagleItemIdFromPath(sourcePath);
+		if (!itemId || !/^[A-Za-z0-9_-]+$/.test(itemId)) throw new Error(t('viewer.itemMismatch'));
+		const currentLibrary = utils.findLibraryRoot(filePath);
+		const itemLibrary = utils.findLibraryRoot(sourcePath);
+		if (!currentLibrary || !itemLibrary || path.resolve(currentLibrary) !== path.resolve(itemLibrary)) {
+			throw new Error(t('viewer.itemMismatch'));
+		}
+		if (sourcePath === filePath) {
+			const urlItemId = urlParams.get('id');
+			if (urlItemId && urlItemId !== itemId) throw new Error(t('viewer.itemMismatch'));
+		}
+		const response = await fetch('http://localhost:41595/api/item/info?id=' + encodeURIComponent(itemId));
 		let result = null;
 		try { result = await response.json(); } catch (e) { /* use HTTP status below */ }
 		if (!response.ok || !result || result.status !== 'success' || !result.data) {
 			throw new Error(t('viewer.apiHttp', { status: response.status }));
 		}
-		if (result.data.name + '.' + result.data.ext !== path.basename(filePath)) throw new Error(t('viewer.itemMismatch'));
-		if (result.data.ext === 'txt' && /\.atlas\.txt$/i.test(filePath)) throw new Error(t('viewer.txtRegistered'));
-		return { id: pathItemId, data: result.data };
+		if (result.data.name + '.' + result.data.ext !== path.basename(sourcePath)) throw new Error(t('viewer.itemMismatch'));
+		return { id: itemId, data: result.data, sourcePath };
 	}
 
 	async function setEagleCustomThumbnail(itemId, thumbnailPath) {
@@ -512,71 +533,183 @@
 		return result;
 	}
 
+	function currentResourcePaths() {
+		if (!activeAssets) return [];
+		return [...new Set([
+			activeAssets.skeletonPath,
+			activeAssets.atlasPath,
+			...Object.values(activeAssets.texturePaths || {}),
+		].filter(Boolean).map((file) => path.resolve(file)))];
+	}
+
+	async function collectGroupThumbnailItems() {
+		const rows = [];
+		for (const sourcePath of currentResourcePaths()) {
+			try {
+				const item = await getEagleItemForPath(sourcePath);
+				rows.push({
+					...item,
+					name: path.basename(sourcePath),
+					state: item.data.customThumbnail === true ? 'custom' : 'ready',
+				});
+			} catch (error) {
+				rows.push({ sourcePath, name: path.basename(sourcePath), state: 'unavailable', error });
+			}
+		}
+		return rows;
+	}
+
+	function confirmGroupThumbnail(rows) {
+		const dialog = document.getElementById('thumbDialog');
+		const list = document.getElementById('thumbDialogList');
+		const confirm = document.getElementById('thumbDialogConfirm');
+		const cancel = document.getElementById('thumbDialogCancel');
+		const ready = rows.filter((row) => row.state === 'ready');
+		const skipped = rows.length - ready.length;
+		document.getElementById('thumbDialogSummary').textContent = t('viewer.groupDialogSummary', {
+			generate: ready.length,
+			skip: skipped,
+		});
+		list.textContent = '';
+		for (const row of rows) {
+			const entry = document.createElement('div');
+			entry.className = 'thumb-dialog-row' + (row.state === 'ready' ? '' : ' skipped');
+			const name = document.createElement('span');
+			name.className = 'thumb-dialog-name';
+			name.textContent = row.name;
+			name.title = row.sourcePath;
+			const state = document.createElement('span');
+			state.className = 'thumb-dialog-state';
+			state.textContent = t(row.state === 'ready' ? 'viewer.groupWillGenerate'
+				: row.state === 'custom' ? 'viewer.groupSkipCustom' : 'viewer.groupUnavailable');
+			entry.append(name, state);
+			list.appendChild(entry);
+		}
+		confirm.disabled = ready.length === 0;
+		dialog.classList.remove('hidden');
+		return new Promise((resolve) => {
+			const finish = (accepted) => {
+				dialog.classList.add('hidden');
+				confirm.removeEventListener('click', accept);
+				cancel.removeEventListener('click', reject);
+				document.removeEventListener('keydown', keydown);
+				resolve(accepted ? ready : []);
+			};
+			const accept = () => finish(true);
+			const reject = () => finish(false);
+			const keydown = (event) => { if (event.key === 'Escape') reject(); };
+			confirm.addEventListener('click', accept);
+			cancel.addEventListener('click', reject);
+			document.addEventListener('keydown', keydown);
+			cancel.focus();
+		});
+	}
+
+	async function renderCurrentFrameThumbnail() {
+		playing = false;
+		updatePlayButton();
+		if (state) state.apply(skeleton);
+		updateWorld(skeleton);
+
+		const size = 400;
+		const bounds = getBounds(skeleton);
+		const off = document.createElement('canvas');
+		off.width = size; off.height = size;
+		const octx = off.getContext('2d');
+		octx.fillStyle = '#1e1e1e';
+		octx.fillRect(0, 0, size, size);
+		if (bounds && bounds.width > 0 && bounds.height > 0) {
+			const pad = 0.1;
+			const scale = Math.min((size * (1 - pad * 2)) / bounds.width, (size * (1 - pad * 2)) / bounds.height);
+			const cx = bounds.x + bounds.width / 2;
+			const cy = bounds.y + bounds.height / 2;
+			octx.save();
+			octx.translate(size / 2, size / 2);
+			octx.scale(scale, -scale);
+			octx.translate(-cx, -cy);
+			if (document.getElementById('backgroundCheck').checked) require('../js/spine-background.js').drawCheckerboard(octx, size, size);
+			let offRenderer = null;
+			try {
+				offRenderer = clippingRenderer.createRenderer(spine, octx, activeRuntimeDir);
+				offRenderer.premultipliedAlpha = premultipliedAlpha;
+				offRenderer.draw(skeleton);
+			} finally {
+				if (offRenderer && offRenderer.dispose) offRenderer.dispose();
+				octx.restore();
+			}
+		}
+		await drawSpineBadge(octx, size, size);
+		require('../js/spine-badge.js').drawVersion(octx, size, size, skeletonData.version || activeVersion);
+		let out = off.toDataURL('image/webp', 0.9);
+		const isWebp = out.startsWith('data:image/webp');
+		if (!isWebp) out = off.toDataURL('image/png');
+		return { buffer: Buffer.from(out.split(',')[1], 'base64'), extension: isWebp ? '.webp' : '.png' };
+	}
+
+	async function generateGroupThumbnails() {
+		if (!skeleton || !renderer || !activeAssets) { setStatus(t('viewer.noSkeletonForThumb')); return; }
+		const groupThumbBtn = document.getElementById('groupThumbBtn');
+		groupThumbBtn.disabled = true;
+		let tempPath = null;
+		try {
+			const rows = await collectGroupThumbnailItems();
+			const targets = await confirmGroupThumbnail(rows);
+			if (targets.length === 0) {
+				if (rows.length && rows.every((row) => row.state !== 'ready')) setStatus(t('viewer.groupNoTargets'), 4000);
+				return;
+			}
+			setStatus(t('viewer.generating'), Infinity);
+			const rendered = await renderCurrentFrameThumbnail();
+			tempPath = path.join(os.tmpdir(), 'spineviewer-group-' + crypto.randomBytes(12).toString('hex') + rendered.extension);
+			fs.writeFileSync(tempPath, rendered.buffer);
+			let success = 0, skipped = rows.filter((row) => row.state !== 'ready').length, failed = 0;
+			for (let index = 0; index < targets.length; index++) {
+				setStatus(t('viewer.groupGenerating', { current: index + 1, total: targets.length }), Infinity);
+				try {
+					// 确认后再读一次，避免在对话框打开期间覆盖用户新设的缩略图。
+					const fresh = await getEagleItemForPath(targets[index].sourcePath);
+					if (fresh.data.customThumbnail === true) { skipped++; continue; }
+					await setEagleCustomThumbnail(fresh.id, tempPath);
+					success++;
+					log('用户确认批量更新资源组缩略图: item=' + fresh.id);
+				} catch (error) {
+					failed++;
+					log('资源组缩略图失败: ' + ((error && error.stack) || error));
+				}
+			}
+			setStatus(t('viewer.groupComplete', { success, skip: skipped, failed }), 6000);
+		} catch (e) {
+			setStatus(t('viewer.thumbnailFailed', { error: (e && e.message) || String(e) }), 6000);
+			log('生成当前资源组缩略图失败: ' + ((e && e.stack) || e));
+		} finally {
+			try { if (tempPath && fs.existsSync(tempPath)) fs.unlinkSync(tempPath); } catch (e) { /* ignore */ }
+			groupThumbBtn.disabled = false;
+		}
+	}
+
 	async function generateThumbnail() {
 		if (!skeleton || !renderer) { setStatus(t('viewer.noSkeletonForThumb')); return; }
 		const thumbBtn = document.getElementById('thumbBtn');
 		thumbBtn.disabled = true;
+		let tempPath = null;
 		try {
-			const currentItem = await getCurrentEagleItem();
+			const currentItem = await getEagleItemForPath(filePath);
 			if (currentItem.data.customThumbnail === true && !window.confirm(t('viewer.replaceCustomThumbnailConfirm'))) return;
 			setStatus(t('viewer.generating'), Infinity);
-			// 暂停动画，冻结当前帧：先确保当前动画时间已被应用到骨骼
-			playing = false;
-			updatePlayButton();
-			if (state) state.apply(skeleton);
-			updateWorld(skeleton);
-
-			const size = 400;
-			const bounds = getBounds(skeleton);
-			const off = document.createElement('canvas');
-			off.width = size; off.height = size;
-			const octx = off.getContext('2d');
-			octx.fillStyle = '#1e1e1e';
-			octx.fillRect(0, 0, size, size);
-
-			if (bounds && bounds.width > 0 && bounds.height > 0) {
-				const pad = 0.1;
-				const scale = Math.min((size * (1 - pad * 2)) / bounds.width, (size * (1 - pad * 2)) / bounds.height);
-				const cx = bounds.x + bounds.width / 2;
-				const cy = bounds.y + bounds.height / 2;
-				octx.save();
-				octx.translate(size / 2, size / 2);
-				octx.scale(scale, -scale);
-				octx.translate(-cx, -cy);
-				if (document.getElementById('backgroundCheck').checked) require('../js/spine-background.js').drawCheckerboard(octx, size, size);
-				let offRenderer = null;
-				try {
-					offRenderer = clippingRenderer.createRenderer(spine, octx, activeRuntimeDir);
-					offRenderer.premultipliedAlpha = premultipliedAlpha;
-					offRenderer.draw(skeleton);
-				} finally {
-					if (offRenderer && offRenderer.dispose) offRenderer.dispose();
-					octx.restore();
-				}
-			}
-			await drawSpineBadge(octx, size, size);
-			require('../js/spine-badge.js').drawVersion(octx, size, size, skeletonData.version || activeVersion);
-
-			// Eagle 的 *_thumbnail.png 通常实际保存 WebP；优先使用 WebP 显著减小体积。
-			let out = off.toDataURL('image/webp', 0.9);
-			const isWebp = out.startsWith('data:image/webp');
-			if (!isWebp) out = off.toDataURL('image/png');
-			const buf = Buffer.from(out.split(',')[1], 'base64');
-			const tempPath = path.join(os.tmpdir(), 'spineviewer-current-' + crypto.randomBytes(12).toString('hex') + (isWebp ? '.webp' : '.png'));
-			try {
-				fs.writeFileSync(tempPath, buf);
-				await setEagleCustomThumbnail(currentItem.id, tempPath);
-				setStatus(t('viewer.thumbUpdated', { format: isWebp ? 'WebP' : 'PNG', size: (buf.length / 1024).toFixed(1) }), 3500);
-				log('用户主动更新当前素材缩略图: item=' + currentItem.id + ' (' + buf.length + 'B)');
-			} catch (e) {
-				setStatus(t('viewer.thumbnailFailed', { error: (e && e.message) || String(e) }), 6000);
-			} finally {
-				try { if (fs.existsSync(tempPath)) fs.unlinkSync(tempPath); } catch (e) { /* ignore */ }
-			}
+			const rendered = await renderCurrentFrameThumbnail();
+			tempPath = path.join(os.tmpdir(), 'spineviewer-current-' + crypto.randomBytes(12).toString('hex') + rendered.extension);
+			fs.writeFileSync(tempPath, rendered.buffer);
+			await setEagleCustomThumbnail(currentItem.id, tempPath);
+			setStatus(t('viewer.thumbUpdated', {
+				format: rendered.extension === '.webp' ? 'WebP' : 'PNG',
+				size: (rendered.buffer.length / 1024).toFixed(1),
+			}), 3500);
+			log('用户主动更新当前素材缩略图: item=' + currentItem.id);
 		} catch (e) {
 			setStatus(t('viewer.thumbnailFailed', { error: (e && e.message) || String(e) }), 6000);
-			log('生成当前帧缩略图失败: ' + ((e && e.stack) || e));
+			log('生成当前素材缩略图失败: ' + ((e && e.stack) || e));
 		} finally {
+			try { if (tempPath && fs.existsSync(tempPath)) fs.unlinkSync(tempPath); } catch (e) { /* ignore */ }
 			thumbBtn.disabled = false;
 		}
 	}
@@ -925,6 +1058,7 @@
 
 	// ---------- 加载资源并与运行时交互 ----------
 	async function loadAssets() {
+		activeAssets = null;
 		if (!utils.extOf(path.basename(filePath))) {
 			// Registering txt/bytes is required by Eagle's extension dispatch.
 			// Ordinary text remains readable and never starts Spine discovery.
@@ -970,6 +1104,7 @@
 			}
 			return;
 		}
+		activeAssets = assets;
 		let savedPma;
 		try {
 			const settings = require('../js/spine-preview-settings.js');
@@ -1131,6 +1266,7 @@
 	document.getElementById('reloadBtn').addEventListener('click', () => {
 		window.location.reload();
 	});
+	document.getElementById('groupThumbBtn').addEventListener('click', generateGroupThumbnails);
 	document.getElementById('thumbBtn').addEventListener('click', generateThumbnail);
 	function seekTimelineToNearestFrame() {
 		const snappedTime = snapTimeToFrame(parseFloat(timeline.value));