Image Optimizer

Περιγραφή 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 more than 300,000 websites on different CMS (WordPress, 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 initially 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 !

Συχνές Ερωτήσεις

How great is ?

Since we’ve optimized more than 4,000,000,000 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.


please dont use this plugin.

it regenerate thumbnails and those thumbnails are not in correct order. 🙁

i found the same thing happened to another user, his comment is 100% correct.

Divi compatible ?

Hello re.smushit 🙂

I am on Divi 3.17.6 and wordpress 4.9.8.
Does your plugin works with my environment ?

Thanks a lot,

Saves so much time and makes my site run A LOT faster!

If you are new to WordPress, you need to be aware that you should be very be careful about which plugins you use (performance, security, etc.), but there are a few that are almost vital to having a site that performs well. I consider this to be one of them!

When I first started using WordPress, I was compressing images (via and then uploading them. What I didn’t realize, initially, was that every time I uploaded an image, WordPress was creating a bunch of different sized thumbnails to use throughout the site.

Once I was aware of this, I checked the image sizes of the thumbnails and found them to be larger than desirable. Obviously, fixing these manually would have been awkward and terribly time consuming, so I decided to research optimization plugins.

All my research pointed to one:, and I’ve found it to do an amazing job.

If you decide to use it, please rate it and consider buying these guys a beer via their website. After all, you’re getting something really great for nothing!

Lost all image files

I’ve never left a 1-star review on a plugin before, but i just used this two days ago, and today my site wasn’t loading ANY images. Across 200+ blog posts.

I noticed the image URLs with «-unsmushed» in the slug would still load if I enter the URL manually, but nothing else.

I had to restore my entire website back 3 days to fix this. It’s cost me hours of time and a lot of stress.

I don’t know what I did wrong. I’m sure this plugin works great for some people. But it was a disaster for me.

Maybe I was supposed to keep it installed forever? I uninstalled the plugin after optimizing my images, and then this happened 2 days later.

Anyway, total nightmare for me and I really wish I hadn’t done this.

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Συνεισφέροντες & Προγραμματιστές

“ Image Optimizer” είναι λογισμικό ανοιχτού κώδικα. Οι παρακάτω έχουν συνεισφέρει στη δημιουργία του.


Σύνοψη αλλαγών


  • WordPress 5.0 compatibility


  • Fix PHP errors with PHP 7.2
  • Code refacto


  • Fix JS on «Optimize» button for a single picture
  • Provide a new «Force Optimization» for a single picture


  • Avoid filesize () : stat failed errors if a picture file is missing
  • Log check file permissions
  • Check extensions on upload (avoid using API if it’s not a picture)
  • Increase API Timeout for big pictures (10 secs)


  • Fix bug (non-working optimization) on bulk upload when «Optimize on upload» isn’t selected
  • New header banner for 4 billionth images optimized


  • Add correction for allow_url_fopen support
  • News feed loaded from a SSL URL


  • Log rotate if file too big


  • Tested up to WordPress 4.9.5
  • New contributor (resmushit)
  • Translation completion


  • 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