內容簡介
Thumbnail Manager 是一款 WordPress 外掛，專為管理縮圖而設計，能夠重新生成圖片尺寸、避免縮圖膨脹，並安全清理媒體庫中未使用的生成檔案。此外掛適合新網站及大型媒體庫使用，提供靈活的縮圖管理功能。
【主要功能】
• 重新生成現有圖片的 WordPress 縮圖
• 生成缺失的圖片尺寸或強制重新生成選定媒體
• 禁用未來上傳的多餘圖片尺寸
• 在更改縮圖設置前進行建議審查
• 清理未使用的縮圖，保留所選尺寸
• 支援批次處理和恢復中斷的任務
外掛標籤
開發者團隊
原文外掛簡介
Thumbnail Manager is a WordPress thumbnail management plugin for regenerating image sizes, preventing thumbnail bloat, and safely cleaning unused generated files from the Media Library.
Use it after changing themes, updating WooCommerce image settings, adjusting registered image sizes, migrating a site, or discovering years of old thumbnail files. Thumbnail Manager lets you decide which sizes WordPress should generate, rebuild missing thumbnails, inspect cleanup candidates, and delete only an explicitly approved manifest.
The plugin is designed for both new sites and large, long-running Media Libraries. Persistent cursor-based jobs process work in batches, survive page reloads or network interruptions, and can be limited to multiple upload years or months.
Key Features
Regenerate WordPress thumbnails for existing image attachments
Generate only missing image sizes or force-regenerate selected media
Disable unwanted registered image sizes for future uploads
Review recommendations before changing thumbnail settings
Prune unused thumbnails while preserving the sizes you choose to keep
Scan first, review an immutable hashed manifest, then approve deletion separately
Search and select multiple upload years or month folders in one Prune job
Filter and paginate large deletion manifests with estimated storage totals
Detect legacy thumbnail sizes stored in attachment metadata
Report unmapped disk-only orphan files without deleting them by default
Resume regeneration, recommendation, scan, and delete jobs after interruption
Review active and recent jobs with retained audit information
Use responsive admin screens that inherit the user’s WordPress Color Scheme
Safe WordPress Thumbnail Cleanup
Prune Files uses a review-first workflow instead of deleting files immediately:
Choose the registered image sizes to keep.
Scan all uploads or select multiple year and month folders.
Review the immutable manifest and estimated storage total.
Confirm the reviewed manifest explicitly.
Delete approved generated files in resumable batches.
Original full-size uploads are protected. Paths are validated inside the WordPress uploads directory, and attachment metadata is updated when generated size files are removed.
Built for Large Media Libraries
Thumbnail Manager avoids a single long-running request for large operations. Persistent jobs, cursor-based attachment queries, bounded AJAX batches, folder-limited scans, operation locks, and per-item errors make long media maintenance tasks easier to monitor and resume.
The Prune folder picker groups upload directories by year, supports search and bulk selection, and automatically removes overlapping month selections when an entire year is selected.
WooCommerce and Theme Changes
Thumbnail Manager recognizes WooCommerce-related image sizes in Recommendations and helps you review them before disabling, regenerating, or pruning files. It is also useful after switching themes or removing plugins that registered custom image sizes.
What Thumbnail Manager Does Not Do
It does not compress or change image quality.
It does not replace an image optimization, WebP, CDN, or offload plugin.
It does not delete original uploaded images.
It does not automatically delete files without manifest review and approval.
It does not unregister image sizes from the theme or plugin that registered them.
Usage
Recommended Workflow
Open Tools > Thumbnail Manager.
Run Recommendations and review which sizes appear necessary.
Open Thumbnail Sizes and save the sizes WordPress should generate for future uploads.
Run Regenerate to rebuild missing or selected thumbnails.
Open Prune Files and choose the sizes to keep.
Select All uploads or choose multiple upload folders.
Scan, review the manifest, and approve deletion only when the result is correct.
Regenerate Thumbnails
Use Regenerate after changing image dimensions, switching themes, changing WooCommerce image settings, migrating media, or restoring missing thumbnail files. Process all image attachments, the current year, a selected uploads folder, or specific attachment IDs.
Only Missing generates absent sub-sizes. Force Regenerate rebuilds metadata and selected sub-sizes from the original image path when WordPress provides one.
Thumbnail Sizes
Use Thumbnail Sizes to control which registered image sizes WordPress should generate for future uploads. Disabling a size does not remove existing files; use Prune Files when you are ready to scan and review old generated thumbnails.
Recommendations
Recommendations reviews registered sizes against protected WordPress sizes, WooCommerce-related sizes, attachment metadata, and common content references. Treat the result as an informed starting point and review it for your theme and site before applying changes.
Prune Files
Choose the image sizes to keep, decide whether to scan all uploads or selected year/month folders, and start Scan. Scanning builds a manifest only. Nothing is deleted until the scan finishes, the manifest is displayed, and an administrator explicitly approves it.
Optional orphan discovery includes metadata-backed legacy sizes in the review. Unmapped disk-only filename matches are reported and skipped by default.
Technical Notes
Uses intermediate_image_sizes_advanced to control future thumbnail generation
Uses dedicated persistent job and job-item tables instead of storing full queues in transients
Uses cursor-based AJAX queues for regeneration, recommendations, pruning, orphan discovery, manifest creation, and deletion
Separates scan, immutable manifest review, explicit approval, and deletion
Binds expiring job tokens and manifests to the current site and user
Supports resume, server-side cancellation, operation locking, cleanup, and per-item error tracking
Uses attachment metadata as the primary source for prune candidates
Validates filesystem paths under the WordPress uploads directory
Updates attachment metadata after generated thumbnail files are removed
Prefers the original image path during force regeneration when WordPress provides one
Requires the manage_options capability
Runs per site on WordPress multisite
Privacy
Thumbnail Manager does not collect, store, or transmit personal data to external services. All thumbnail scans, regeneration, recommendations, and cleanup operations run locally on your WordPress site.
