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When images are uploaded in the WordPress Media library section WordPress creates some thumbnails of that image. The size of these thumbnail images can be mentioned in the <code>Settings->Media</code> section.
But there can be some big issues with these thumbnails. WordPress Crop/Resize these images dynamically when you upload an image. When thumbnails are CROPPED it is very much possible that it gets CROPPED from the wrong section of the uploaded image. This can produce some BAD looking thumbnail images. Which doesn’t look good in frontend of the site. This plugin will allow you to update those thumbnail images manually. The thumbnail image edit interface that this plugin provides is simple and very easy to use.
The shortcodes and functions are provided in the image editor page of the plugin.
Image editor links can be found in WordPress Media Library.
Image files that can be edited are JPG, JPEG, GIF and PNG
<h4>Thumbnail Editor PRO</h4>
<a href="https://www.aviplugins.com/thumbnail-editor-pro/" rel="nofollow ugc">Checkout the PRO version features here</a>. PRO version costs only USD 2.00
<ul>
<li>Support for Amazon S3 Bucket.</li>
<li>Completely replace thumbnail images and upload new ones.</li>
<li>Add Custom Texts to thumbnail images. You can add signature in the images.</li>
<li>Different Text Fonts are available to choose from.</li>
<li>Add Image Effects like Gray Scale, Sketch, Negative or Add Color Effects to the Image.</li>
<li>Add image Borders with different border colors.</li>
<li>Option to Revert Back the changes you made in the image.</li>
</ul>

Thumbnail Editor

This is a very easy to use plugin that can be used to replace default WordPress image thumbnails.
This will make your images look good when you use them in your site. You can use shortcode to display images in your post or page.



Easy to use

Manually Crop and Resize thumbnail images that are uploaded in the Media section.

ShortPixel

A free, fast, and easy-to-use Regenerate Thumbnails plugin, created and maintained by the team behind <a href="https://wordpress.org/plugins/shortpixel-image-optimiser/" rel="ugc">ShortPixel Image Optimizer</a>.
The reGenerate Thumbnails Advanced (RTA) plugin is ideal if you are switching to a new WordPress theme with different image sizes. It updates your old thumbnails to fit your new theme and the Pro version helps you clean up unused thumbnails, to ensure all your images have the perfect size.
Simplicity is the key with our plugin, it’s as easy as 3 clicks and you’re good to go 😉
Features: 
– You can choose to regenerate thumbnails only for featured images; 
– You can easily customize the thumbnail list by adding any number of additional thumbnail sizes to suit your needs; 
– You can select the preferred image quality for the regenerated thumbnails; 
– Clean, simple and user-friendly interface with a progress bar showing the percentage of regenerated images; 
– Statistics at the end of the process showing the total number of thumbnails regenerated; 
– “Resume” feature that picks up the regeneration process exactly where you left off if your browser processing tab closes unexpectedly or you have manually paused the process; 
– And fully integrated with <a href="https://wordpress.org/plugins/shortpixel-image-optimiser/" rel="ugc">ShortPixel Image Optimizer</a> for thumbnails compression and enhanced functionality;
PRO Features: 
You will find exciting features in the <a href="https://shortpixel.com/products/regenerate-thumbnails-advanced-pro?source=WPORG" rel="nofollow ugc">PRO version</a>, with more to come: 
– WP-CLI support to regenerate thumbnails. Especially useful for websites with a very large number of images, or when wp-admin resources are limited; 
– Automatic removal of outdated thumbnails that are no longer used; 
– You can choose to delete the metadata for missing images and thumbnails; 
– Remove missing images and thumbnails from the media library if they no longer exist on the disk, along with the associated metadata; 
– Automatically start image optimization with ShortPixel Image Optimizer immediately after regenerating the thumbnails; 
– Select intervals (last day, last week, last month or all images at once) for thumbnails regeneration as well as a custom interval of your choice;
Enhance Your WordPress website with the reGenerate Thumbnails Advanced Plugin
Managing images in the WordPress environment can sometimes be complex, but the reGenerate Thumbnails Advanced plugin simplifies this task, enhancing your website’s visual esthetics. More than just a standard WP thumbnail plugin, it offers unique features to improve the functionality and appeal of your website.
Easy Image Management for WordPress Users
One of the biggest challenges for WordPress website owners is keeping image sizes consistent. This is where our plugin comes into play, not only regenerating thumbnails but also changing the visual presentation of your website. Whether you’re updating a theme or revamping the look of your website, the reGenerate Thumbnails Advanced plugin will help you keep your images consistent and professional.
Regenerate Thumbnails Made Easy
For anyone who has ever experienced the need to regenerate thumbnails WordPress-wide, our plugin offers an intuitive and user-friendly approach. It is designed to fit perfectly in the WordPress environment, and ensures that your images are always presented in the best possible way without you having to laboriously adjust them manually.
Optimized Thumbnails for Improved Performance
Once you’ve successfully regenerated your thumbnails with Regenerate Thumbnails Advanced, the next step is a breeze. Easily optimize these thumbnails with ShortPixel Image Optimizer to significantly boost their performance. This integration not only ensures that your images are of the highest quality but also increases the overall efficiency of your website. With ShortPixel’s powerful optimization features, you can look forward to faster load times, improved SEO, and a better user experience.
A Versatile Tool for Different Needs
Whether you run a personal blog or a large e-commerce platform with WooCommerce, the reGenerate Thumbnails Advanced plugin is versatile enough to meet a variety of needs. It’s more than just regenerate thumbnails WooCommerce-style; it’s a comprehensive image management solution.
Optimize WordPress Thumbnails for Peak Performance
In the WordPress domain, the impact of thumbnails on website esthetics and performance cannot be overstated. Our plugin not only helps WordPress regenerate thumbnails but also optimizes these thumbnails for improved loading speed and quality, enhancing the overall user experience.
Full Control Over Your Thumbnails
The ability to force regenerate thumbnails gives you complete control over how your images are displayed. This aspect of the reGenerate Thumbnails Advanced plugin is particularly useful for those who frequently update their content and need their images to reflect these changes immediately.
Support: 
For support please contact us <a href="https://shortpixel.com/contact" rel="nofollow ugc">here</a> making sure you mention reGenerate Thumbnails Advanced (RTA) plugin.
Other plugins by <a href="https://shortpixel.com" rel="nofollow ugc">ShortPixel</a>
<ul>
<li><a href="https://wordpress.org/plugins/fastpixel-website-accelerator/" rel="ugc">FastPixel Caching</a> – WP Optimization made easy</li>
<li><a href="https://wordpress.org/plugins/shortpixel-image-optimiser/" rel="ugc">ShortPixel Image Optimizer</a> – Image optimization & compression for all the images on your website, including WebP & AVIF delivery</li>
<li><a href="https://wordpress.org/plugins/shortpixel-adaptive-images/" rel="ugc">ShortPixel Adaptive Images</a> – On-the-fly image optimization & CDN delivery</li>
<li><a href="https://wordpress.org/plugins/enable-media-replace/" rel="ugc">Enable Media Replace</a> – Easily replace images or files in Media Library</li>
<li><a href="https://wordpress.org/plugins/resize-image-after-upload/" rel="ugc">Resize Image After Upload</a> – Automatically resize each uploaded image</li>
<li><a href="https://wordpress.org/plugins/wp-svg-images/" rel="ugc">WP SVG Images</a> – Secure upload of SVG files to Media Library</li>
<li><a href="https://wordpress.org/plugins/shortpixel-critical-css/" rel="ugc">ShortPixel Critical CSS</a> – Automatically generate above-the-fold CSS for fatster loading times and better SEO scores</li>
</ul>
Get in touch!
<ul>
<li>Email <a href="https://shortpixel.com/contact" rel="nofollow ugc">https://shortpixel.com/contact</a></li>
<li>Twitter <a href="https://twitter.com/shortpixel" rel="nofollow ugc">https://twitter.com/shortpixel</a></li>
</ul>

reGenerate Thumbnails Advanced

5 stars for this plugin that not only regenerates the thumbnails (which is what is supposed to do), but also lets you choose which ones you want to regenerate, which ones you want to delete, and it even lets you create new thumbnails!

Does what it says and more


Great plugin, still checking the site for now. But 250k previews were cleaned, which was caused by a poorly set template that generated 40 previews from each file. Many thanks for saving lot of hours work.


Top plugin, fast and reliable cleaning

Regenerate thumbnails quickly and easily, including forced regeneration; very useful when changing a theme or adding new thumbnail sizes.

Thumbnail Editor vs reGenerate Thumbnails Advanced