Image Optimizer

Description Image Optimizer allow to use free Image optimization based on API. provides image size reduction based on several advanced algorithms. The API accept JPG, PNG and GIF files up to 5MB.

This plugin includes a bulk operation to optimize all your pictures in 2 clicks ! Change your image optimization level to fit your needs !
This service is used by thousands of websites on different CMS (Drupal, Joomla, Magento, Prestashop…).

The plugin includes an option to exclude some pictures of the optimizer.

Since Aug. 2016, allows to optimize pictures up to 5MB, for free !

This plugin has been developped by Maecia Agency, Paris.


  • The simple interface


  1. Upload resmushit-image-optimizer to the /wp-content/plugins/ directory.
  2. Activate the plugin through the ‘Plugins’ menu in WordPress.
  3. All your new pictures will be automatically optimized !


Installation Instructions
  1. Upload resmushit-image-optimizer to the /wp-content/plugins/ directory.
  2. Activate the plugin through the ‘Plugins’ menu in WordPress.
  3. All your new pictures will be automatically optimized !
How great is ?

Since we’ve optimized more than 3,000,000,000 pictures, we’ve risen new skills. Our service is still in development to bring you new crazy functionalities.

Is there an “Optimize on upload” feature ?

Absolutely, this feature is enabled for all new pictures to be added, and can be disabled on will.

Can I choose an optimisation level ?

Yes, by default the optimization level is set at 92. But you can optimize more your pictures by reducing this optimization level.

Can I go back to my original pictures ?

Yes, by excluding/reverting this asset you’ll have your original image available.

Is it possible to exclude some pictures from the optimizer ?

Yes, since version 0.12, you can easily exclude an asset from the optimizer.

Have I a risk to lose my existing pictures ?

Nope ! Image Optimizer creates a copy of the original pictures, and will perform optimizations only on copies.

Is it free ?

Yes ! Absolutely free, the only restriction is to send images below 5MB.



Love this plugin!! After trying couple of plugin this is the real deal.

Best one, hands down

Definitely the best image optimization service and plugin. You guys are heroes for offering this for free. Amazing!

The ONLY thing I would love to see in this plugin is to have the smushing happen in the background via ajax or even cron. Currently when you upload an image, it takes 10s or more to process before you can use it. When uploading a batch of images then it’s time for a coffee break…

Image smushing takes time, that’s expected, but if it was done in the background then you could still upload an image and use it in your post without waiting for the smushing to complete. I’m pretty sure WP Smush does it this way.

Best plugin – better then wp-smushit pro

Save your money and rather invest here. That is a great plugin and it gives much better results than SmushIt Pro by WPMUDEV, who are using the former Yahoo serves as their base for image smushing.

I recommend using instead of any other plugin, especially instead of wp_smush_Pro.

DON’T believe their advertisements as NOTHING is Free at WPMUDEV


The only one which is really free is resmushit and if they would provide a way to connect the wp_smush_pro backend (it is GNU GPL v.2) to the resmushit API of resmushit it would be the best replacement for image compression ever.

Thanks for that great plugin

Read all 18 reviews

Contributors & Developers

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




  • Tested up to WordPress 4.9.1
  • New header banner for 3 billionth images optimized 🙂


  • Tested up to WordPress 4.8.1


  • New header banner for 2 billionth images optimized 🙂


  • Slovak translation fix


  • Slovak translation fix


  • Italian translation added (thanks to Cristian R.)
  • Description minor correction


  • Slovak translation added (thanks to Martin S.)


  • Bug fix when images uploaded > 5MB
  • List of files above 5MB
  • Translation minor corrections


  • Error management if webservice not reachable
  • Filesize limitation increased from 2MB to 5MB


  • CSS Fixes


  • Translation correction
  • News feed images correction


  • Delete also original file when deleting an attachment
  • Exclusion of an attachment of the optimization (checkboxes)
  • Adding french translation
  • Code optimizations
  • 4.6.x check
  • Minor bugs corrections


  • Optimize on upload
  • Statistics
  • Log services
  • Interface rebuild
  • News feed from


  • plugin base
  • bulk optimizer