Real Thumbnail Generator – Efficiently Regenerate Thumbnails in Mass (Lite)


Turn your WordPress media thumbnails to the next level with fast mass regeneration. Single or bulk regenerate images and create a custom thumbnail upload structure with this unique plugin (Pro).

RTG (Real Thumbnail Generator) Lite allows you easily to regenerate all your (existing) thumbnails in your media library. You can regenerate a single or bulk images. The regeneration of thumbnails can up to be 33 % faster than other plugins due to chunked regeneration. Just install this plugin and it works fine with all your image and media files. It also supports multisite.

Features (Lite):

  • WordPress 5.0 ready
  • Single regenerate images in media library table, grid and attachment view mode
  • Bulk regenerate in media library (table and grid mode)
  • Works great with PDF files (WP 4.7+ required)
  • Regenerate your whole media library
  • Works with your existing images
  • Can be up to 33 % faster than other plugins because RTG uses less requests to regenerate
  • GPDR / DSGVO: The plugin is collecting no personal data!
  • Compatible with touch devices
  • Supports multisite

PRO Version available with additional features:

  • Skip already existing thumbnail files
  • Only regenerate a set of image sizes, that means if you have registered a new image size you can only regenerate that one. That means you can skip other image sizes.
  • Custom upload structure for thumbnail pathes and filenames (you can define a pattern with placeholders)
  • Detect unused image sizes (for example after theme switch) and delete them
  • One time payment, forever free updates
  • Fast support

→ Interested in the Pro version?


  • A new "Thumbnails" button is added to the media library
  • You can analyse all your items to recalculate the index
  • Or directly bulk rengerate your images
  • Jump from single file to single view
  • Single view
  • Available settings


  1. Goto your wordpress backend
  2. Navigate to Plugins > Add new
  3. Search for “WP Real Thumbnail Generator”
  4. “Install”


  1. Download the plugin from this site (
  2. Copy the extracted folder into your wp-content/plugins folder
  3. Activate the “WP Real Thumbnail Generator” plugin via the plugins admin page

Συχνές Ερωτήσεις

What does “Custom upload structure” mean?

The custom upload structure can be easily set in the media settings of the Pro version. Here is a little example how the WP standard upload looks like:
… and after you set a custom upload structure it can look like:


9 Σεπτεμβρίου 2019
This review is for the Premium version! The task was to migrate a Joomla! page to WordPress and the customers were not happy with WordPress´ media file management. They used to create a physical folder per blog post, add the images for this post and create a slider out of all images in this folder. WordPress had to be tricked into that sort of media management with the help of @mguenter´s plugins "Real Media Library" (free) "Physical Custom Upload Folder" (premium) and Real Thumbnail Generator" (premium). What is special about this plugin? There are a few plugins out there that allow generation of a physical upload folder within /wp-content/uploads. The thing is: WordPress automatically generates thumbnails for every image within the folders and adds them to the folder. So, the sliders contain not only the images themselves, but the thumbnails as a "bonus". This plugin allowed me to generate the thumbnails in a sub-folder, so they are not added to the sliders. Yay! Works perfectly well, saved me some coding time and is, as far as I found, the only plugin to do so.
Ανάγνωση 1 κριτικής

Συνεισφέροντες & Προγραμματιστές

“Real Thumbnail Generator – Efficiently Regenerate Thumbnails in Mass (Lite)” είναι λογισμικό ανοιχτού κώδικα. Οι παρακάτω έχουν συνεισφέρει στη δημιουργία του.


Σύνοψη αλλαγών

07 October 2019 – Version 2.0.5

  • Fixed bug with thumbnails path when using %size-identifier%
  • Fixed bug with 503er server errors and retry regenerate again

21 August 2019 – Version 2.0.4

  • Added search by filename in Analyse / Regenerate tab
  • Fixed bug with WooCommerce thumbnails and custom cropping
  • Improved error handling so the process does not stop when an error occurs
  • Improved performance by only loading images when hovering in analyse item
  • Improved performance by list virtualization
  • Improved height of opened analyse dialog

09 August 2019 – Version 2.0.3

  • Fixed bug with page reload in “Edit attachment” page
  • Fixed bug while error is logged when opening an attachment in the dialog
  • Fixed bug when attachment is deleted and shows still as “Unused”
  • Improved regeneration list that now all items are clickable
  • Released lite version

19 March 2019 – Version 2.0.2

  • Fixed bug with style/script dependencies

21 February 2019 – Version 2.0.1

  • The plugin is now fully compatible with Crop-Thumbnails plugin
  • Fixed bug with Internet Explorer
  • Fixed bug with icons
  • Fixed bug with PDFs

15 February 2019 – Version 2.0

  • Complete code rewrite
  • … Same functionality with improved performance
  • … with an eye on smooth user interface and experience
  • Added option to skip existing thumbnail files
  • Added autoupdater functionality in Plugins > “License settings”
  • Added checbox to select / deselect all registered thumbnail sizes
  • Fixed bug with generation of single thumbnail sizes
  • Fixed compatibility with Simple Matted Thumbnails
  • Fixed compatibility with EWWW Image Optimizer
  • Improved performance and usability

23 March 2018 – Version 1.1.7

  • Added “Regenerate” button to PDF files in list view
  • Fixed bug with PDF thumbnails while getting “-1” prefix

22 March 2018 – Version 1.1.6

  • Fixed bug with PDF generation in thumbnail folders
  • Fixed bug with deletion of old thumbnails when changing the thumbnails schema
  • Fixed bug with deletion of empty thumbnail folders

10 October 2017 – Version 1.1.5

  • Fixed bug with duplicate info containers about thumbnails

25 May 2017 – Version 1.1.4

  • Added option to set a chunk size for regeneration

14 April 2017 – Version 1.1.3

  • Fixed bug with SVG images

03 February 2017 Version 1.1.2

  • Fixed bug with AJAX Search Pro
  • Fixed bug with Facebook hint in plugins site

04 January 2017 – Version 1.1.1

  • Fixed bug with failed thumbnail sizes
  • Fixed bug with .txt upload
  • Fixed bug with regenerating only a set of sizes

09 December 2016 – Version 1.1

  • Added ability to regenerate only specific image sizes
  • Fixed bug with copped image sizes

29 November 2016 – Version 1.0.1

  • Added the MatthiasWeb promotion dialog

10 November 2016 – Version 1.0

  • initial review