Description
Force Regenerate Thumbnails allows you to delete all old images size and REALLY regenerate the thumbnails for your image attachments.
See the screenshots tab for more details.
Screenshots
The plugin at work regenerating thumbnails 
You can resize specific multiples images using the checkboxes and the "Bulk Actions" dropdown
Installation
- Go to your admin area and select Plugins -> Add new from the menu.
- Search for “Force Regenerate Thumbnails”.
- Click install.
- Click activate.
FAQ
- Installation Instructions
-
- Go to your admin area and select Plugins -> Add new from the menu.
- Search for “Force Regenerate Thumbnails”.
- Click install.
- Click activate.
Reviews
July 19, 2021
At first I was a bit cautious because the plugin has not been updated in years. So I tested in a staging site first and it worked like a charm. Used it on the production too without any error. It's a great plugin. Does what it is supposed to do.
September 3, 2020
Worked great Sept 2020!
June 19, 2020
Works perfectly to get rid of all those unused thumbnails. Definitely recommend.
April 16, 2020
I've changed the Thumbnail size and Medium size to different values than the defaults(150 and 300), and I wanted to delete the old ones. But this plugin just regenerated the thumbnails. I find it useless.
September 5, 2019
Great but overwrites EXIF data, sush as camera model, shutter time, iso, etc..
August 16, 2019
Does what it is supposed to do 🙂
Contributors & Developers
“Force Regenerate Thumbnails” is open source software. The following people have contributed to this plugin.
Contributors
“Force Regenerate Thumbnails” has been translated into 20 locales. Thank you to the translators for their contributions.
Translate “Force Regenerate Thumbnails” into your language.
Interested in development?
Browse the code, check out the SVN repository, or subscribe to the development log by RSS.
Changelog
2.0.6
- Add PHP7 compatibility
2.0.5
- No timeout limit
2.0.4
- Fix issue when “opendir()” return FALSE (thanks Krody Robert)
2.0.3
- Add debug information on regenerate
- Fix issue with update “_wp_attachment_metadata” and “_wp_attached_file” on windows
2.0.2
- New style for results (thanks @justonarnar)
- Automatic update “_wp_attachment_metadata” and “_wp_attached_file” (thanks @norecipes)
2.0.1
- Fix issue with get_option(‘upload_path’) in WordPress 3.5+ (thanks @DavidLingren)
2.0.0
- Fix error handle
1.8
- New function to display ajax results
1.7
- Fix issue with getters path in Linux/Windows/Unix servers
1.6
- New CORE to regenerate thumbnails
1.5
- Reviewed some messages
1.4
- Change default image editor to GB in WordPress 3.5+ (thanks @nikcree)
1.3
- Fix message error when WP_DEBUG in wp_config.php
1.2
- Fix for JPEG images
1.1
- Delete all custom image sizes when regenerate thumbnails
- Notifies you when thumbnails was deleted
1.0
- First release.