Regenerate Thumbnails
Regenerate the thumbnails for one or more of your image uploads. Useful when changing their sizes or your theme.
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Overview
Compatibility
Installation instructions
Customer support & learning resources
Changelog
Main benefits
Regenerate all thumbnail sizes
Delete old, unused thumbnails
Adapt to new themes
Free up server space
About this plugin
Author: Alex Mills
Categories: Media Management
Version: 3.1.6
Last updated: 14-08-2023
WordPress version: 4.7
Tested up to: 6.3.5
PHP version required: 5.2.4
Languages: Albanian, Catalan [+67]
Tags:
Learning resources: View resources
Overview
Regenerate Thumbnails is a WordPress plugin designed to regenerate all thumbnail sizes for images in your Media Library. This functionality is particularly useful if you've added a new thumbnail size, changed the dimensions of an existing size, or switched to a new WordPress theme that requires different image dimensions. Additionally, the plugin offers a feature to delete old, unused thumbnails to conserve server space. Originally created by the late Alex Mills, the plugin is now maintained by Automattic and the WordPress community. Alternatives such as WP-CLI and Jetpack’s Photon Module are recommended for users with specific needs for speed or on-the-fly thumbnail creation. Support for Regenerate Thumbnails is available through WordPress.org forums and its source code can be accessed on GitHub.
Regenerate Thumbnails for New Sizes
- Allows you to regenerate all thumbnail sizes for one or more images in your Media Library.
- Useful when a new thumbnail size has been added and you want past uploads to have a thumbnail in that size.
Adjust Existing Thumbnail Dimensions
- Enables you to regenerate thumbnails when you’ve changed the dimensions of an existing thumbnail size.
- Helps in maintaining consistency across your site when dimensions are altered via Settings → Media.
Compatibility with New Themes
- Facilitates the regeneration of thumbnails when you switch to a new WordPress theme.
- Ensures that featured images conform to the new theme's required sizes.
Free Up Server Space
- Offers the ability to delete old, unused thumbnails.
- Helps in freeing up server space by removing unnecessary image files.
Rating and reviews
21stcn
05 Aug, 2024
WordPress scales down very big images, adding a ‘full’ image with ‘-scaled’ suffix, and stores the original file and it’s name in the db. RT plugin however regens thumbails based on the ‘scaled’ image, so all the intermediate sizes are re-named. This can break images when combined with offloading etc.
Unless I am missing something, this ‘-scaled’ resizing of big images is default wordpress functionality so the RT plugin should handle it properly by using the original image (using functions like wp_get_original_image_url, wp_get_original_image_path) etc, so as not to orphan a whole set of thumbnails, use the wrong full image and generate a new set of intermediate sizes.
Eg:These are the currently registered thumbnail sizes, whether they exist for this attachment, and their filenames:
thumbnail: 280×178 pixels (cropped to fit) 8C2A3575-scaled-280x178.jpg
medium: 300×300 pixels (proportionally resized to fit inside dimensions) 8C2A3575-scaled-300x200.jpg
medium_large: 0×0 pixels (thumbnail would be larger than original)
large: 720×1200 pixels (proportionally resized to fit inside dimensions) 8C2A3575-scaled-720x480.jpg
avatar: 180×180 pixels (cropped to fit) 8C2A3575-scaled-180x180.jpg
1536×1536: 1536×1536 pixels (proportionally resized to fit inside dimensions) 8C2A3575-scaled-1536x1024.jpg
2048×2048: 2048×2048 pixels (proportionally resized to fit inside dimensions) 8C2A3575-scaled-2048x1366.jpg
featured-medium: 700×446 pixels (cropped to fit) 8C2A3575-scaled-700x446.jpg
featured-large: 1398×1398 pixels (proportionally resized to fit inside dimensions) 8C2A3575-scaled-1398x932.jpg
extra-large: 1598×1598 pixels (proportionally resized to fit inside dimensions) 8C2A3575-scaled-1598x1066.jpg
The attachment says it also has these thumbnail sizes but they are no longer in use by WordPress. You can probably safely have this plugin delete them, especially if you have this plugin update any posts that make use of this attachment.
medium (old): 300×200 pixels 8C2A3575-300x200.jpg
large (old): 720×480 pixels 8C2A3575-720x480.jpg
thumbnail (old): 280×178 pixels 8C2A3575-280x178.jpg
avatar (old): 180×180 pixels 8C2A3575-180x180.jpg
1536×1536 (old): 1536×1024 pixels 8C2A3575-1536x1024.jpg
2048×2048 (old): 2048×1365 pixels 8C2A3575-2048x1365.jpg
featured-medium (old): 700×446 pixels 8C2A3575-700x446.jpg
featured-large (old): 1398×932 pixels 8C2A3575-1398x932.jpg
extra-large (old): 1598×1065 pixels 8C2A3575-1598x1065.jpg
cmplz_banner_image: 350×100 pixels 8C2A3575-350x100.jpg
This topic was modified 2 weeks, 6 days ago by 21stcn.
Asad
09 Jul, 2024
Very useful plugin. I have been using this plugin for the last 5 years.
infinityfree
08 Jul, 2024
It should be built-in WordPress feature. So useful!
davs63
23 Mar, 2024
Bonjour et merci à l’auteur
Ce plugin à sauvé mon site, ou en tout cas plusieurs heures de travail. Les images étaient présente dans le backup mais pas les miniatures. Donc je ne voyais plus rien dans la médiathèque. Et cette extension a recréé toute les mignatures !!
Il mérite les 5 etoiles
W★
03 Mar, 2024
Thank you for continuing to maintain this plugin in memory of Alex Mills. And it’s commendable that WP-CLI and other alternatives are mentioned, which is anything but a matter of course.
