Robin image optimizer — save money on image compression


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Make your website faster by reducing the weight of images. Our WordPress image optimizer plugin can cease image weights on 80% without any loss of quality.

Robin image optimizer is a smart and advanced image optimizer that really stands out among other WordPress plugins. Robin image optimizer is a WordPress free image optimizer plugin with zero limitations in terms of number of images and optimization quality. The only thing that you may stumble across is the image weight, which shouldn’t exceed 5 MB.

What’s the purpose of image optimization?

The lighter the weight of the image – the faster your page loads. With the constant growth of mobile users, increases the necessity in mobile websites optimization. If you don’t want to get many rejections and lose money due to the poor ad performances, we’d recommend you to start with image optimization.

Why should we use Robin image optimizer for image optimization?

  • The first and the most significant difference from the counterparts: our plugin is absolutely free and has the same features as paid products.

  • This WordPress image optimizer doesn’t have any limits or restrictions in image optimization.

  • Automatic optimization using Cron. You don’t need to wait til optimization is completed; the plugin will be optimizing couple of images every several minutes in the background.

  • Manual mass-optimization. Press the button and wait til your images are optimized

  • Image backup. Before optimization starts, all images are being stored in original quality. Then, when optimization is over, you can restore lost images or re-optimize them in another quality.

  • You can choose compression mode (normal, regular, high). Compression mode influences image weight and quality. The higher the compression, the worse is the quality and the smaller is the weight.

  • Image optimization on boot.

  • Reducing pre-optimization image weight by changing image size.

  • Detailed statistics on optimized images


We invite you to check out a few other related free plugins that our team has also produced that you may find especially useful:

Learn more about the Pro version

Thanks the authors of plugins

We used some useful functions from plugins Imagify Image Optimizer, Smush Image Compression and Optimization, EWWW Image Optimizer, Image Optimizer, ShortPixel Image Optimizer.


If you want to help with the translation, please contact me through this site or through the contacts inside the plugin.


  • The simple interface
  • Optimization log
  • Settings page
  • Media library


  1. Upload robin-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 !


Why is this plugin free and how long it will be this way?

Our WordPress plugin to optimize images uses API of this free service:, So as long as these guys allow free image optimization, our plugin will remain free. Still, we have several ideas of how to make optimization free and planning to implement them in our plugin.

Are there any limits for image optimization?

There are no limits for image optimization in our plugin. The only thing we have is a kind of a restriction of image weight – it should be greater than 5 MB. But our plugin can reduce pre-optimization image weight, so you’ll be able to optimize almost all images you have.

What image formats do you support?

Robin image optimizer can optimize jpg, png and gif (both animated or not).

Do you remove EXIF images data?

EXIF-data is removed by default. However, you can keep it by disabling the feature.

Do you remove source images?

No. Robin image optimizer replaces images with their optimized analogues. The backup option stores source images and allows restoring them in one click.

Can I re-optimize images in another mode?

Yes. By enabling the backup feature in the plugin, you can re-optimize any image using another compression mode.

Does plugin support WebP format?

Yes, use modern image formats, such as WebP. Robin image optimizer PRO automatically creates WebP copies of your original images.

Browsers with the WebP format support will display WebP images. Other browsers will replace such images with JPG, PNP, GIF, BMP, etc.
Learn more about PRO version

Plugin has integration with Nextgen gallery?

Robin image optimizer PRO has full integration with NextGen Gallery, which helps to use all the plugin features.
Learn more about PRO version



Novambor 14, 2020
Finally, with Robin, my clients can do what they love - upload 10MB photos to use on the website. And even not killing it
Oktubor 25, 2020
The plugin changes the image url, that coauses problems with the location and broken image on the website. Coused many additional work hours to fix it.
Séptembor 21, 2020
I unchecked the option of image backup. My original Image is in 3840 × 2160. Resizing large images - on - with 2560x2560 Original image is still saved on host drive with original name.jpg Optimized image's name is name-scaled.jpg Last Version of plugin. Is it bug? I don't need that.
Séptembor 16, 2020
Buduję stronę na której planuję umieścić kilka tysięcy zdjęć. Po kompresji każde zdjęcie mam w ośmiu wersjach, w tym zdjęcie wyjściowe. Ja potrzebuję tylko jedną miniaturę. Osiem zdjęć to bardzo poważny problem z punktu zajętości dysku na serwerze. Dla stron gdzie jest mało zdjęć to nie problem, dla mnie rozwiązanie nie do zaakceptowania. Inne wtyczki o podobnej funkcjonalności mają taki sam problem. Nie rozumiem dlaczego tak robicie. Powinna być możliwość wyboru co się wgrywa na dysk hostingowy. Proszę o poradę jak ten problem rozwiązać. I am building a website where I plan to put several thousand photos. After compression, I have eight versions of each photo, including the original photo. I only need one thumbnail. Eight photos is a very serious problem in terms of disk usage on the server. For websites with few photos this is not a problem, for me it is an unacceptable solution. Other plugins with similar functionality have the same problem. I don't understand why you do that. It should be possible to choose what to upload to the hosting disk. I am asking for advice on how to solve this problem.
Read all 87 reviews

Contributors & Developers

“Robin image optimizer — save money on image compression” is open source software. The following people have contributed to this plugin.




  • Added: Lazy Load option for images


  • Fixed: jQuery.fn.load() and other bugs after update to WordPress 5.5


  • Fixed: Problem with choosing an optimization server on WordPress 5.5
  • Added: Optimization mode for Google PageSpeed [PRO]


  • Fixed: Unable to change the server if it is unavailable after selection.
  • Added: Added filter wbcr/rio/backup/backup_dir for changing the backup directory.
  • Added: Restriction of free servers (at the request of administrators of free servers)
  • Changed PRO feature: WebP conversion is not possible without using a premium server
  • Added: Ability to optimize files of selected formats (JPEG, PNG, GIF)
  • Added: Ability to choose the order of image optimization: starting with new images or starting with old ones

1.4.2 (21.01.2020)

  • Fixed: Сompatible with Clearfy 1.6.3.
  • Fixed: PHP error “Class ‘Wbcr_FactoryClearfy_Compatibility’ not found”.
  • Fixed: Minor bugs.
  • Removed: Server 4 beta.
  • Added: Premium server.

1.4.1 (24.12.2019)

  • Fixed: Some bugs
  • Added: Сompatible with WordPress 5.3


  • Fixed: Php warning (Declaration of WRIO_Image_Statistic_Folders)


  • Fixed: Plugin pages loaded for a very long time.
  • Fixed: Bugs with error logging.
  • Fixed: Error warnings have become more understandable.
  • Fixed: Мigration bugs with cache plugins.
  • Fixed: Bulk optimization stopped if an error occurred during image optimization.


  • Fixed: Minor errors


  • Fixed: PHP Error: Illegal mix of collations.
  • Fixed: Error 500 when trying to migrate.
  • Fixed: Context class not found error.
  • Fixed: PHP Fatal error: Class ‘WRIO_StatisticPage’ not found.
  • Fixed: Auto optimization on upload. Error in Gutenberg.
  • Fixed: Bug when restoring backup. Also increase the recovery quota for backup.
  • Added: Compatibility with WordPress 5.2.x
  • Updated: Improved error logging.


Fixed: On sites with php version 5.6 and below there was a syntax error.
Fixed: Broken links to support service.
Fixed: If site had a lot of images 15,000 and higher, bulk optimization page was loaded slow.


  • Added: Compatibility with WordPress 5.1.x
  • Added: Required php version 5.4
  • Added: Last optimization log. You can view latest optimized images, as well as monitor errors when optimizing images.
  • Added: New server optimization (Server 4). The server is free, at the moment it is in beta mode.
  • Added: Custom quality values. You can set your own image optimization quality settings.
  • Added: Resize images in height and width. Previously, plugin automatically resized largest image side.
  • Added: Select the optimization mode. Before you start optimizing, you will see a modal window, which will offer you 2 modes of optimization (scheduled and manual).
  • Added: Improved error debug. Now you can learn more about all the errors in optimizing images using the powerful debug log.
  • Added: Server rating. Now you can easily choose a server to optimize images based on its rating.
  • Added PRO feature: WebP Conversion. Use modern image formats, such as WebP. Robin image optimizer PRO automatically creates WebP copies of your original images. Browsers with the WebP format support will display WebP images. Other browsers will replace such images with JPG, PNP, GIF, BMP, etc.
  • Added PRO feature: NextGEN Gallery Integrations. Do you use a popular plugin to create galleries? Robin image optimizer PRO has full integration with NextGen Gallery, which helps to use all the plugin features.
  • Added PRO feature: Compress any Image in any Directory. Optimize images of themes and plugins! Robin image optimizer PRO can optimize images in any directory. If the themes & plugins developers don’t optimize their products Robin will fix it!


  • Fixed: Added compatibility with ithemes sync


  • Fixed: Compatibility with W3 total cache
  • Fixed: Compatibility with External Media without Import


  • Fixed: Some bugs
  • Fixed: Removed limit on image resizing
  • Fixed: Update core framework
  • Added: New free server
  • Added: Servers status, you can select available servers to optimize images
  • Added: Added compatibility with the plugin Clearfy
  • Preparing plugin for multisite support


  • Added: Ability to re-optimize images with errors.
  • Fixed: Some bugs
  • Added: An alternative server for image optimization. Now you can select an alternative optimization server if the current server is unavailable.
  • Fixed: Problems with translations

= 1.0.7
* Fixed: Images are saved in a size 0 bytes
* Fixed: Trying to backup file with empty filename
* Fixed: Curl replacement for file_get_contents
* Fixed: Statistics


  • Fixed: fixed bar progress styles
  • Fixed: changed the link to the reviews page


  • Fixed: corrected image size calculations for individual optimization


  • Fixed: update core framework


  • Fixed: small bugs


  • Release