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  4. Regenerate Thumbnails
Regenerate Thumbnails icon

Regenerate Thumbnails

Regenerate the thumbnails for one or more of your image uploads. Useful when changing their sizes or your theme.

By Alex Mills·Thumbnail·Free
4.6(395 reviews)
·1.0M+ active installs·Updated 7 months ago
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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.

4.6/5395 reviews
1.0M+active installs
22M+total downloads
18 yearssince 2008

Overview

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:

  • A new thumbnail size has been added and you want past uploads to have a thumbnail in that size.
  • You’ve changed the dimensions of an existing thumbnail size, for example via Settings → Media.
  • You’ve switched to a new WordPress theme that uses featured images of a different size.

It also offers the ability to delete old, unused thumbnails in order to free up server space.

In Memory of Alex Mills

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…

Read full description on WordPress.org

Screenshots

Ratings & Reviews

4.6395 reviews
5 ★
340
4 ★
18
3 ★
3
2 ★
8
1 ★
26

Recent Reviews

Works Pretty Well
by zack00·3 weeks ago·1 reply

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.

Very, very, very happy with the results
by JHouse·5 months ago·1 reply

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.

Screwed all the references to images in a Portrait orientation
by chrisdubea·7 months ago·1 reply

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.

Thanks!
by sjcm94·7 months ago·1 reply

Thank you, Alex, for still supporting us.

Works. Good info too
by moviemoon·1 year ago·1 reply

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.

Download Trends

Today: 2KYesterday: 2KThis week: 13KPeriod total: 686K

Compatibility

WordPress4.7+ requiredTested up to 6.8.5
PHP5.2.4+ required

Version Adoption

v3.1
93.5%
Other
6.5%

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Frequently Asked Questions

Changelog

Version 3.1.6

  • Fix: Respect “Skip regenerating existing correctly sized thumbnails” setting.
  • Fix: Don’t delete all thumbnails when deleting old unregistered thumbnails size.
View full changelog on WordPress.org

Contributors

Alex MillsAlex Mills
Plugin Info
Version
3.1.6
Last Updated
Aug 20, 2025
WP Requires
4.7+
Tested Up To
6.8.5
PHP Requires
5.2.4+
Active Installs
1.0M+
Downloads
22M+
Added
Aug 28, 2008
Business
Free

Tags

thumbnailthumbnailspost thumbnailpost thumbnails

Developer

A
Alex Mills
5 plugins1.0M+ total installs
View all plugins →

Quick Compare

Regenerate Thumbnails vs Force Regenerate Thumbnails→Regenerate Thumbnails vs XO Featured Image Tools→Regenerate Thumbnails vs Conditionally display featured image on…→

Plugin data sourced from WordPress.org. Analysis and metrics by PluginSift.