reGenerate Thumbnails Advanced


A free, fast and easy to use regenerate thumbnails plugin supported by ShortPixel 🙂

Regenerate Thumbnails Advanced (RTA) plugin comes in handy when you install a new WordPress theme on your site that has different image sizes. While the newly uploaded images will be cropped and resized to fit your new theme, the old thumbnails will remain unchanged. Using RTA you can regenerate the thumbnails for all your existing images.
It is also very useful when you have many not-used-anymore thumbnails and you want to remove them while making sure you have all the needed thumbnails generated.


  • Choose the quality of the regenerated thumbs.
  • Option to remove not-used-anymore thumbnails.
  • Remove metadata for missing images and thumbnails
  • Fully integrated with ShortPixel Image Optimizer.
  • Option to select the thumbnail size for featured and non-featured images.
  • Option to easily add as many extra thumbnail sizes as you wish.
  • Interval selection (last day, week, month, all) for the thumbs that will be regenerated.
  • Clean and simple interface where you have a progress bar showing you the percentage of images regenerated.
  • Resume function – the regeneration process will continue from where it was left in case you accidentally close the processing tab in your browser.

For support please contact us here making sure you mention RTA plugin.


  • Plugin settings page


Nothing special about the installation process, just visit „Plugins“ section in your /wp-admin, search for „regenerate thumbnails advanced“, install & activate the plugin and then from Settings section you can start using it.


Can I regenerate just a few images

You have the option to select from: all, past day, past week, past month

What happens if I close the page while the regeneration process is running?

The script stops but it will resume after you open the settings page of the plugin once again.


28. Dezember 2019
When trying to use it it drops an Invalid Nonce error and nothing happens. I even have the license for the ShortPixel plugin that continue to display stupid warnings if you use a plugin that actually works! ShortPixel Image Optimizer Warning The following plugins are not compatible with ShortPixel and may lead to unexpected results: Regenerate Thumbnails
30. September 2019
5 stars for this plugin that not only regenerates the thumbnails (which is what is supposed to do), but also lets you choose which ones you want to regenerate, which ones you want to delete, and it even lets you create new thumbnails!
18. April 2019
There was a problem the first time I ran the plugin, my site is still not on the latest PHP, which caused the problem. Within hours of my support request they had a new version and it worked perfectly.
15. April 2019
Found thumbnails but did nothing. I have Shortpixel as my main image handler too 🙁
19. März 2019
Hello, I just wanted to drop a line to the makers of this plug-in. The thumbnails look amazing - before I had super blurry images and this little app does exactly what I had hoped it would - create clear, crisp pictures. But unfortunately, I still see a big problem: For some reason not all of my thumbnails are square, and I am not sure why... I wish that I could pick that I wanted all of my images to be uniform, because it looks sloppy in the gallery view when some pictures are a uniform, square size and others are other rectangle sizes.. I would be very happy if you could fix this. Plus points if you add a feature where you can pick the crop (square area) of the picture that is shown... not all of my pictures have their focus in the middle. Thanks!
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Release date: 9th March 2020
* Reworked and improved the process interface
* Option in media library to regenerate just one image
* Will check for post_mime_type in posts and fix it when it’s empty.
* Cookie-based processing removed, now keeps progress as a server setting
* Internal processes optimized.
* Fixed – WordPress 5.3 image handling and scaled images
* Fixed – Metadata not being removed in some cases when „Delete Leftover Image Metadata“ is checked.
* Fixed – Logger doesn’t call wp_upload_dir when not debugging


Release date: 7th June 2019
* Replace the two options Exact size for featured/non-featured images with one checkbox Only featured
* Button to stop the regeneration
* Make Keep existing be checked by default
* Change „Regenerate selected thumbnails“ checklist to a settings selection
* ShortPixel Image Optimizer integration – call the ’shortpixel-thumbnails-regenerated‘ action passing only the changed sizes
* Fix: Security – Image sizes XSS exploit
* Fix: count(): Parameter must be an array


Release date: 17th April 2019
* Fix warnings related to corrupted metadata in some cases


Release date: 16th April 2019
* Plugin completely rewritten with additional features added:
* Add custom thumbnails
* Select which thumbnails to regenerate
* Regenerate thumbnails only for the featured images
* Rewrite the existing thumbnails or not depending on the selected options
* Integrate seamlessly with ShortPixel Image Optimizer
* Delete unused thumbnails from disk
* Remove metadata for missing images and thumbnails


  • please refer to the changelog.txt file inside the plugin archive for the versions before the 2.0.0 full rewrite.