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Thumbnail Manager helps regenerate WordPress image sizes, prevent future thumbnail bloat, and review generated files before cleanup. Use it after changing themes or WooCommerce image settings, migrating a site, or finding obsolete sizes in a long-running Media Library.
Large operations run as persistent, bounded jobs. They continue in batches, survive a page reload or network interruption, and use scoped processing where the workflow supports it.
Thumbnail control and regeneration
- Review every registered image size and decide which sizes WordPress should generate for future uploads.
- Generate only missing sizes or force-regenerate selected image attachments.
- Regenerate all media, current-year images, one uploads folder, or specific image attachments.
- Review conservative keep recommendations with explicit evidence and confidence based on protected size policies, attachment metadata, and common content references.
- Resume or cancel persistent jobs and review recent job results and per-item errors.
Review-first cleanup
Prune Files separates discovery from deletion:
- Choose the image sizes to keep.
- Scan all uploads or selected year and month folders.
- Review the immutable, hashed manifest and estimated storage total.
- Explicitly approve the reviewed manifest.
- Delete only those approved generated files in resumable batches.
Original full-size uploads are protected. Candidate paths are validated inside the WordPress uploads directory, and attachment metadata is updated only when an exact metadata-backed generated size is removed.
Prune Files can optionally include verified disk-only legacy thumbnails for currently disabled sizes. A separate opt-in can also discover conservatively verified historical thumbnails from fixed image sizes that are no longer registered by the current theme or plugins. Unverified, ambiguous, sidecar, backup-like, or otherwise unmapped disk files remain preserved and do not enter the deletion manifest.
Scope
Thumbnail Manager controls image-size generation, regeneration, and cleanup. It does not compress images, configure a CDN, offload media, or unregister a size from the theme or plugin that originally registered it. Force Regenerate can follow WordPress image-editor output-format filters, including WebP or AVIF when supported by the site, while keeping original/full-size sources protected.
Recommendations are an informed starting point, not proof that a size is used or unused. Missing scan evidence leaves the current size setting unchanged. Verify the sizes used by the active theme, plugins, WooCommerce templates, and custom code before disabling generation or approving deletion.
Privacy
Thumbnail Manager does not collect, store, or transmit personal data to external services. Thumbnail analysis, regeneration, recommendations, and cleanup run locally on the WordPress site.
Persistent settings, job history, audit/recovery rows, and derived media-reference data remain in the site’s database after deactivation or plugin deletion. Browser-local job tokens may also remain in the administrator’s browser. Review and remove retained data separately when required by the site’s privacy policy.
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