Regenerate the thumbnails for one or more of your image uploads. Useful when changing their sizes or your theme.
As of April 2026, Regenerate Thumbnails is a WordPress thumbnail plugin with 1.0M+ active installations and a 4.6/5 rating from 395 reviews. It has been downloaded 22M+ times in total. Requires WordPress 4.7+ and PHP 5.2.4+. Available on WordPress.org since 2008. Download volume is stable this week. Top alternative: Force Regenerate Thumbnails.
Regenerate Thumbnails allows you to regenerate all thumbnail sizes for one or more images that have been uploaded to your Media Library.
This is useful for situations such as:
It also offers the ability to delete old, unused thumbnails in order to free up server space.
In February 2019 Alex Mills, the author of this plugin, passed away. He leaves behind a number of plugins which will be maintained by Automattic and members of the WordPress community. If this plugin is useful…
Used it to fix image sizes after changing my theme. Did the job without much hassle. Took some time but worked fine. Pretty useful plugin overall. tnx to the devs for keeping it simple.
For layout and design purposes, I opted to increase the size of all my featured image thumbnails moving forward, but you guessed it, I still had to resize the previous photos. Well, this plugin handled it like a champ! Even removed the ones I wasn’t using any longer so I could free up some server space.
Admittedly, I was a bit scared running this plugin for the first time, however, I made backup of my website files and database before doing so in the event sh!t went south. Not only did it resize them perfectly, it restored some thumbnails that were missing. Now all is awesome!
Thanks for such a great plugin! I will use this exclusively in the future.
Yea,
That was stupid. Foolishly used this, still don’t know why. Screwed up all my references to images in a Portrait orientation.
Luckily I was able to figure it out and with Better Search Replace was able to fix 326 instances of the wrong reference.
Thank you, Alex, for still supporting us.
I really like this plug-in. I don’t need it very often but when I do it works great. For example when I changed the image size for my blog thumbnails and thought i would have a headache!
It shows nice info about images and which sizes will be generated too. Useful. Thank you.
| WordPress | 4.7+ requiredTested up to 6.8.5 |
| PHP | 5.2.4+ required |
Plugin data sourced from WordPress.org. Analysis and metrics by PluginSift.