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.

Check out our new version of reGenerate Thumbnails Advanced with new features including removal of unused thumbnails and metadata entries


  • Unused thumbs of existing images are removed automatically so you won’t waste disk space.
  • Date 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.
  • You get to see the total number of images affected by your period, as well as the images affected so far when processing


  • The plugin page where it all happens
  • View of the dropdown options


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 and the script is loading?

The script stops, it does not run in the background


Almost Perfect

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!

Not Working

I installed this on a very simple WordPress site, but it's not working. When I click the generate button, nothing is happening.

It does nothing!

I click regenerate button and it doesn't matter which option I choose, it simply does nothing.

Does not work

I'm running the latest WP & all plugins are updated. Installed the plugin & tried running it. Nothing happened. No error or warning messages on screen, and there are no messages in the wp-admin errors log. Inspected the page DOM, and there WAS an error message: ...(website path)/wp-json/rta/regenerate 404 () Error: Request failed with status code 404 at createError (bundle.js:80214) at settle (bundle.js:82964) at XMLHttpRequest.handleLoad (bundle.js:80091)
Read all 17 reviews

Contributors & Developers

“reGenerate Thumbnails Advanced” is open source software. The following people have contributed to this plugin.




  • The first upload of the plugin


*Shows errors
*GD library error missing library present
*added jquery ui images for
*added jquery ui min css file
*removed the incrementation of processed images if there are none (it was showing one was being processed when it wasn’t)


*images did not get added in the previous version. Neither did the css file for jquery ui


*log section showing what’s been processed (image name)

*Images processed gets updated on regenerate request (it was frozen before if no images where available to be processed)
*Added a extra image

*Added a “no js or js error” message to the page if it’s the case

*Progress and errors aligned with containers
*javascript changed so that it shows processing for errors when processing starts

*Added time (in seconds) to each processed image – You can see how long each image took
*Error log status changes at the end from Processing to “No errors” if there are no errors.

*Added Settings link in plugins info page
*Renamed submenu page to Regenerate Thumbnails under Settings

*Added the possibility to choose a start and end date from where to regenerate the thumbnails from
* Added new style
* Added datepickers

  • Fixed a wp_debug notice bug
  • Fixed a js issue


This version changes the style and adds a bit of functionality to the general settings (a date start-end option to choose from)


nothing that affect the previous data is changed. Update is save


nothing that affect the previous data is changed. Update is save


nothing that affect the previous data is changed. Update is save


Database field is saved someplace else now. It needs to be configured again. Basically just go into settings, click to activate and click save.

Important bugfixes

Important bugfixes


Reverted back to manual regeneration version. No more on the fly stuff

Removed donate button


Requests are being done trough REST API’s now


Added regenerate Thumbnails button to regenerate individual thumbnail


Added tutorial on generate page.


Updated some tags, no functionality changed

Added freemius funtionality

Removed stats, added donate button


Removed donate button


Added a notification message with a link when a theme is switched


Fixed a fatal error bug conflicting with Contact Form Maker

Added donate button


Removes (cleans up ) thumbnails that are not in use of existing images before it regenerates them.

Fixed a space bug.

Fixed a javascript bug, made it work again, as it wasn’t before. Removed the “plugin for sale ad, removed the donate button”

Fixed a php version incompatibility bug


  • brand new interface built entirely on React with redux
  • You can view miniature versions of the images in the regenerated visible results
  • Removed donate button

Important CORS dev mode removal fix

Console error fix


  • Past day fix
  • Added past 3 months
  • Added past 6 months
  • Added past 1 year

*Removed media page buttons

Simple version change. no functionality changed

Style bug fixed

Style bug fixed again

Javascript error fix


Cors security added for routes
Added ShortPixel informative data

Added more details to the info column

Improved accuracy percentage for compressed images

Added shortpixel logo and promotion


PHP bugfix, removed shortpixel image and link, added paypal button