# Image Sizes Manager — free WordPress plugin

> Choose which thumbnail sizes WordPress makes, cap the size of big uploads, see how much disk space each size uses and regenerate thumbnails in one click.

Source: https://dcarock.com/plugins/image-sizes-manager

- Type: free WordPress plugin
- Price: free (GPL-2.0)
- Version: 1.0.0
- Requires: WordPress 6.0+, PHP 7.4+
- Download: https://dcarock.com/plugins/image-sizes-manager

## What it does

Every image you upload is copied into a pile of **thumbnail sizes**, many of which your site never shows. This plugin lists them all with the **disk space each one takes**, lets you switch off the ones you don't need, caps the size of huge photos and **regenerates your thumbnails** to clean up, all from *one page under Media*.

 
 
- **All sizes:** see every thumbnail size your site makes, from WordPress, your theme and WooCommerce, with its *dimensions and crop*. 
- **Switch off:** turn off the sizes you don't need; *new uploads skip them*. 
- **Disk use:** see how many images have each size and *how much disk space it uses*. 
- **Big image limit:** scale huge uploads down to a longest side you choose (*WordPress default 2560 px*), or turn scaling off. 
- **Originals:** the original upload is *always kept*. 
- **Regenerate:** rebuild all thumbnails, or a single size, *from the original file*. 
- **Safe batches:** works in small batches with a progress bar, so *big libraries never time out*. 
- **Clean-up:** thumbnails that are no longer needed are deleted, and *"Saved by last regenerate"* shows the space you got back. 
- **Old sizes:** finds sizes left behind by a previous theme or plugin and removes them on the next regenerate. 
- **Failures:** images that can't be rebuilt are listed, and *an image is never left half-done*. 
- **Edited images:** images cropped or rotated in WordPress are rebuilt from the edited version. 
- **Simple setup:** one settings page under *Media › Image Sizes*.

## Setup

1. **Install & Activate it.** In WordPress go to Plugins → Add New → Upload Plugin, choose the .zip and click Install Now, then Activate. If the old Image Upload Size Limiter or Image Size Manager is still active, deactivate it — this plugin waits until you do.
2. **Check your sizes.** Go to Media › Image Sizes and see which sizes use the most disk space.
3. **Choose and save.** Switch off the sizes you don't need, set the big image limit, then click Save Changes.
4. **Regenerate.** Click "Regenerate all thumbnails" to clean up the images you already have.

## Frequently asked questions

### used the old Image Upload Size Limiter. Are my settings kept?

Yes. Your max width and height are imported once: the larger value becomes the new "Longest side". If you used Image Size Manager, your size choices carry over as they are.

### Does it delete my original images?

No. Originals are never touched. Regenerating rebuilds the thumbnails from them and only removes thumbnail files that are no longer needed.

### Does it work with any theme and with WooCommerce?

Yes. It lists every size registered on your site, including your theme's and WooCommerce's, so you decide which ones stay.

### Is it really free?

Yes. Free forever, no sign-up, no ads, and it doesn't track you.

### What happens to my data when I delete the plugin?

Your images and thumbnails stay as they are. Deleting the plugin keeps your settings too, because Arock Toolkit and other versions of this plugin share them.

## Changelog

- **1.0.0** (2026-11-14): - First release.; - Replaces the older Image Upload Size Limiter and Image Size Manager plugins and imports their settings.