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, cursor-based jobs. They continue in bounded batches, survive a page reload or network interruption, and can be limited to selected upload years or months.

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.
Process all images, selected attachments, the current year, or selected upload folders.
Review recommendations based on protected WordPress sizes, WooCommerce-related sizes, 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 when a generated size is removed.

Metadata-backed legacy sizes can be included in the review. Disk-only files that match a -WIDTHxHEIGHT pattern but cannot be mapped reliably to attachment metadata are reported and skipped by default.

Scope

Thumbnail Manager controls image-size generation, regeneration, and cleanup. It does not compress images, convert them to WebP or AVIF, configure a CDN, offload media, or unregister a size from the theme or plugin that originally registered it.

Recommendations are an informed starting point. 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.