Theme Egg

Generate Thumbnail allows you to generate all thumbnails on your site. There are already some plugins available for this, but they have one thing in common: All thumbnails are regenerate in a single step. This works fine when you don’t have that many photos on your site. When you have a lot of full-size photos, the script on the server side takes a long time to run. Unfortunately the time a script is allowed to run is limited, which sets an upper limit to the number of thumbnails you can regenerate. This number depends on the server configuration and the computing power your server has available. When you get over this limit, you won’t be able to generate your thumbnails.
Why would you want to generate your thumbnails? WordPress allows you to change the size of thumbnails. This way, you can make the size of thumbnails fit the design of your website. When you change the size to fit for a new theme, all future photos you are going to upload will have this new size. Your old thumbnails won’t be resized. That’s where this plugin comes into action. After changing the image sizes, you can generate all thumbnails. But instead of telling the server to recreate all thumbnails at once, they are generate one after another. Generateing thumbnails for one photo won’t take all too long, so you won’t run into any script timeouts. Note that you still have to wait until all thumbnails have been rebuilt. If you close the page before the task is completed, you have to start all over again.
You can also select the thumbnail sizes you want to generate, so that you don’t need to recreate all images if you’ve just changed one thumbnail-size. You can also choose to only generate post thumbnails (featured images).
This plugin requires JavaScript to be enabled.

Generate Thumbnail

Generate Thumbnail allows you to generate all thumbnails at once without script timeouts on your server.

Jan Karres

devowl.io GmbH

Matthias Günter

Mario Günter

Faruk Garic

(Re)generate single or multiple image sizes for your WordPress website and create a SEO-optimised custom structure for uploading thumbnails.
Regenerate UNLIMITED thumbnails with the free version!
In the course of optimising a WordPress website, it can often be necessary to change the theme – especially if the website is still being created. Unfortunately, a theme change can alter the image sizes and lead to despair. This is where Real Thumbnail Generator comes into play: The WordPress plugin is responsible for regenerating the image sizes. With a few clicks, the problem is solved! This way, themes can be changed as often as desired without negatively affecting the media management.
<h3>Free Sandbox</h3>
You want to try WordPress Real Thumbnail Generator before 
installing? Take a free sandbox and play around!
<a href="https://try.devowl.io/?product=RTG" rel="nofollow ugc">Create sandbox</a>
<h3>Features</h3>
Some of the features listed below are only available in the <a href="https://devowl.io/go/real-thumbnail-generator?source=wordpress-org-description" rel="nofollow ugc">PRO version of Real Thumbnail Generator</a>. They are marked with an asterisk.
<ul>
<li>Mass regeneration of thumbnails in the media library</li>
<li>Regenerating individual images in the media library</li>
<li>Works great with PDF files (<a href="https://devowl.io/knowledge-base/wordpress-pdf-thumbnails-not-generated/" rel="nofollow ugc">note requirements</a>)</li>
<li>Skip already existing thumbnails *</li>
<li>
Detection and deletion of unused image sizes *
</li>
<li>
Reliable and fast regeneration of thumbnails (without aborts as known from other plugins)
</li>
<li>Compatible with all major themes and many plugins</li>
<li>Custom upload structure for thumbnail paths and file names *</li>
<li>
Supports WordPress Multisite
</li>
<li>
One-time payment with lifetime updates
</li>
<li>Fast support from Germany</li>
<li>DSGVO/GPDR: The plugin does not collect any personal data without your consent!</li>
</ul>
<h3>Compatibility</h3>
Real Thumbnail Generator is compatible with all common themes and plugins.

Real Thumbnail Generator: Efficient regeneration of thumbnails in all sizes

Great and up to date


Another freemium plugin that's not even do what it's advertise.Stopped after about 30% of regeneration process, told me to rate the plugin and did not even allowed me to regenerate missing sizes - i need to regenerate all of them.Most of the features are blocked under paywall.That's not the proper way of introducing your product.


Just no

Real Thumbnail Generator is a WordPress plugin for regenerating thumbnails. It is beginner-friendly, SEO-optimised and GDPR-compliant.

Generate Thumbnail vs Real Thumbnail Generator: Efficient regeneration of thumbnails in all sizes