Local WebP optimizer for WordPress. Free converts images to WebP; Pro adds AVIF and site-wide image tools.
Alternatives to Custom Thumbnail Generator
Plugins below are selected for functional relevance and current directory signals. Active-install counts do not affect this ranking.
Relevant replacements
WordPress plugins with similar use cases
Compatibility and update metadata provide context, not a quality guarantee. Review each plugin’s details for your site.
Scan, repair, and regenerate WordPress thumbnails with missing-file detection, outdated-size checks, resumable processing, and clear local history.
Thumbnail Managerv1.6.0
Regenerate WordPress thumbnails, control image sizes, and safely clean generated files with resumable, review-first jobs.
Display all registered image sizes and their full URLs for every image in the WordPress Media Library.
Media Library File Sizev1.8.1
See every file's size in your Media Library, find your largest files, and delete leftover image sizes to free up disk space.
Regenerate image sizes for all, selected or single images, create only the missing sizes, and clean up leftover size files.
ART4ART Thumbnail Doctorv1.0.0
Regenerate thumbnails, identify which theme or plugin declares each size, and review old image sizes with dry-run, quarantine and restore.
Thumbnail Managerv2.3.2
Safely analyze, preview, trash, restore, schedule, regenerate, and manage WordPress thumbnails from a clean tabbed admin screen.
Convert JPEG & PNG images to WebP automatically. Bulk convert, optimize media library, clean unused thumbnails & boost Core Web Vitals. Free forever.
TSO Image Masterv2.1.0
Auto-converts images to WebP, AVIF, JPG or PNG, compresses PDFs, and repairs your media library: broken links, orphans, unused sizes, alt, SEO.