Custom Thumbnail Generator manages image sizes via an AJAX interface. It decouples sizes from themes, ensuring they persist and remain functional.
Alternatives to Generate Thumbnail
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.
AJAX Thumbnail Rebuildv2.2.1
Rebuild your media library one image at a time, without script timeouts - and optimise, replace, or write WebP and AVIF copies of your images.
Local WebP optimizer for WordPress. Free converts images to WebP; Pro adds AVIF and site-wide image tools.
Revolutionary auto featured image generator with AI. Effortlessly create thumbnails, force regenerate thumbnails, and automate image workflows.
Simple Image Sizesv3.2.6
This plugin lets you create custom image sizes for your site. Override your theme sizes directly on the Media settings page, regenerate thumbnails, an …
Automatically generate featured images and post thumbnails for your WordPress posts, and pages.
Thumbnail Managerv2.3.2
Safely analyze, preview, trash, restore, schedule, regenerate, and manage WordPress thumbnails from a clean tabbed admin screen.
Scan, repair, and regenerate WordPress thumbnails with missing-file detection, outdated-size checks, resumable processing, and clear local history.
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 Managerv1.6.0
Regenerate WordPress thumbnails, control image sizes, and safely clean generated files with resumable, review-first jobs.