WordPress themes need thumbnails in different sizes and they even let the user
to change those dimensions. But WordPress has a problem: it does not regenerates
the thumbnails when new sizes are registered.

Thumbnails intercepts the request by themes or plugins to WordPress to get a
specific thumbnail, generates it and caches it on disk. Efficiently,
it produces a perfectly cropped image, with the right dimension avoiding
unpleasant stretching.

Thumbnails does not modify your blog or your media library. When deactivated
the blog returns to its old behavior.

The second important feature is the autoselection of featured image for post which
are missing it. You can choose between the on the fly selection without persist it
or, for better performances, to persist it once selected.

Read the Thumbnails official page
for detailed information.

Theme developers can find instructions to use it (no code tied to Thumbnails
needs to be written!).

Other plugins by Stefano Lissa:

Screen shots

No screenshots are available at this time.


  1. Put the plug-in folder into [wordpress_dir]/wp-content/plugins/
  2. Go into the WordPress admin interface and activate the plugin
  3. Optional: go to the options page and configure the plugin


See the Thumbnails official page.


March 10, 2018
I re-use my post thumbnail images in various ways, so I like to upload them full size, and I need the software to resize them as needed. This plugin does exactly that for me. It performs its magic transparently and makes my pages a lot lighter. Highly recommended.
September 3, 2016
Just want the doctor ordered! This plugin solved my nagging issue on a custom theme. Thank you for sharing.
Read all 4 reviews

Contributors & Developers

“Thumbnails” is open source software. The following people have contributed to this plugin.


Translate “Thumbnails” into your language.

Interested in development?

Browse the code, check out the SVN repository, or subscribe to the development log by RSS.



  • Checked compatibility with WP 5.5


  • Added crop options


  • Compatibility check with WP 5.2.4


  • Compatibility changes


  • Fixed a debug notice


  • Added core size processing
  • Improved admin CSS


  • Added featured image persistence option


  • Compatibility checks with WP 4.7
  • Tagged to be translatable on (even you can help!)


  • Fixes to the options panel


  • Compatibility with WP 4.4.2


  • Fixes


  • First public release (but it is working on many blogs since months)