: Image optimization API

Optimized : 100KB
Original : 384KB
73% saved
Optimized : 100KB
Original : 351KB
71% saved
Optimized : 68KB
Original : 289KB
76% saved
+ images already optimized !

Support us through our new platform !

As is growing, we're offering more and more servers to optimize all the pictures through our API. We're currently planning on providing new servers to enhance the reliability and the latency of the API, but this cost a bunch of money and any help would be appreciated to maintain this service Free of charge :)

As you may know, is not currently earning a single dollar, nor with ads or whatever, so if you appreciate this service, please support us :)

What is reSmush it ? is a FREE API that provides image optimization. has been implemented on the most common CMS such as Wordpress, Drupal or Magento.

Moreover, is the most used image optimization API with more than 7 billions images already treated, and is still totally Free of charge !
Our competitors are Kraken, ImageOptim or ShortPixel, but they're not free :(.

Supported CMS and Tools

New features !

Wordpress plugin has now 100,000 active installations !

We've reached 100,000 installations of our Wordpress plugin, and it's still very goodly rated ! Check it out !

New Linux/Mac Command Line client for

A command line tool (CLI) has been written for a Mac/Linux support : Install it now on your computer/server

Best free image compression plugin of 2018 according to WP Beginner !

The Wordpress plugin has been elected as best free image compression plugin by WP Beginner :)

Wordpress plugin has now 20,000 active installations !

We've reached 20,000 installations of our Wordpress plugin, and it's still very goodly rated ! Check it out !

3 billion!

Our Image Optimization API has now reached (7th dec. 2017) the third billionth image optimized, and provides this service still for Free :) :).

Previous endpoint to be disabled on 13th september 2017

The old endpoint will be disabled in mid-september. The only valid endpoint is

HTTPS certification verification disabled

Since version 1.4.24 (jul. 2017), SSL verification for remote pictures is disabled.

Compression optimization & EXIF stripping

Since version 1.4.21 (feb. 2017), JPEG optimization has been improved with an average additionnal 5% weight reduction. Moreover, EXIF data are by default removed (see API page).

2 billion pictures optimized !!!

We've now reached in Feb. 2017 the second billionth pictures optimized, and still for free :) New servers will arrive this month for still better performances :)

Official Wordpress Plugin

Thanks to Maecia Agency, a new Wordpress plugin has been released for in June, 2016. Please welcome Image Optimizer.

1 billion pictures optimized !

In May 2016, has proudly reached the first billionth Pictures optimized ! And it keeps going on !

API Endpoint has changed

Since March 2016, the endpoint has changed. Please upgrade your scripts from to The old endpoint will be deprecated on 30th Sept. 2016

Customizable image quality factor.

Optimization at 92% Optimization at 75%

Optimization at 92% (82 Kb) and at 75% (54 Kb)

You can now specify your compression level for JPG pictures ! Go to API page for more informations.

How does this works ?

Webservice call

For a standard call, with a JSON response, you just have to call this url and provide the image attribute like one of these options below :

The webservice will return an array of informations about the compressed image (see API page for more informations)


This tool is based on several well-known algorithms such as pngquant, jpegoptim, optipng.
It allows to reduced until 70%-80% the size of uploaded pictures.

Yahoo alternative

You can replace your existing solutions that were running under with that The webservice is fully compatible with the Yahoo's distribution, and it will return more informations about your conversion.

Just replace the old non-working url by the webservice url : and everything will work great!

Replacement webservice tested with Drupal's ImageAPI Optimize module (dev version) and with Wordpress Image Optimizer plugin.

Twitter feed