wordpress plugins

Kraken Image Optimizer

This plugin allows you to optimize your WordPress images through the Kraken API, the world's most advanced image optimization and resizing API.

plugin Kraken Image Optimizer
4 out of 5 based on 64 user ratings.


Version: 2.5.1

This plugin allows you to optimize and resize new and existing WordPress image uploads through Kraken Image Optimizer's API. Both lossless and intelligent lossy optimization modes are supported. Supported filetypes are JPEG, PNG and GIF (including animated). Maximum filesize limit is 32 MB. Even when using's lossy optimization, our system goes the extra mile to ensure that the results are of high quality, every time. You can just install the plugin and stop worrying. For more details, including detailed documentation and plans and pricing, please visit

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Sign up for your FREE Account and try out our plugin with and the rest of our features now, including:100MB of free testing quota
API Access, with dozens of ready-to-use libraries and modules
Web Interface PRO with Image Resizing and sync-to-Dropbox
URL Paster
Page Cruncher
Optimization Stats and History
...and more.

Quick start tutorial:

About the plugin
You can use your Kraken API key and secret on as many sites/blogs as you like. We have no per-site license.
All images uploaded throught the media uploader are optimized on-the-fly. All generated thumbnails are optimized too.
The main image upload can be optionally resized - this is useful for preventing user uploads with unnecessarily large dimensions. You can specify the maximum width and/or height in>Settings.
When restricting the maximum dimensions of the main image using the resizing feature, the resulting image is enhanced using various advanced techniques, to help prevent downsample artifacts and "haloing" and produce a sharper result.
You can optionally preserve one or more of the Date, Copyright, Geotag, Orientation, Profile EXIF metadata tags.
Images can be automatically oriented according to their EXIF Orientation value - no need to manually rotate images.
All images already present in the media library can be optimized individually, or using the Bulk Action menu "Krak 'em all" feature.
This plugin does not require any root or command-line access. No compilation and installation of any binaries is necessary.
All optimization is carried out by sending images to's infrastructure, and pulling the optimized files to your WordPress installation.
To use this plugin, you must obtain a full API key and secret from Our free account comes with a limited quota for testing our premium features, including this plugin.
Works great with WPEngine hosted blogs, including the staging area.
Since version 1.0.4, the plugin will work with local WordPress installations; the client site does not need to be published on the web.

★★★★★ Excellent Option for Image Optimization "The real power of Kraken is their "intelligent lossy" optimization. I use it on all my sites and have never once needed to roll back an image because of too much quality degredation. While I hope to see some more advanced settings added to the WordPress plugin in the future, it is a perfect solution as is." - collin

★★★★★ Quality results, quality service "The plugin works really well and effortlessly, and the support is prompt, thoughtful, and thorough. I'm hooked." — illustrata

★★★★★ Optimize according to Google Pagespeed "Kraken was instrumental in optimizing images to comply with Google's Pagespeed analyzing tool. Our travel blog now sports Google's 'mobile friendly' tag for mobile searches" — Walter Schaerer

★★★★★ Perfect solution to speed up site! "I love this plugin! All the questions I had are quickly responded to and I see a huge saving with image size without losing the quality. I highly recommend this plugin!" — ezone69

Once you have obtained your credentials, from your WordPress admin, go to the settings page. The from there you can enter your API credentials, and select your optimization preferences. Once you have done this, click on Save. If everything is in order, it will simply say "settings saved" and give you a reassuring green tick that your credentials are valid. You can now start optimizing images from within Media Library. Any image you upload from now on, through any of the media upload screens will be optimized on-the-fly by Kraken.

For advanced users, there is a third party WordPress Command Line Interface (CLI) tool to allow image optimization from the command line, or by using cron. For details, visit:

Please send bug reports, problems, feature requests and so on to support (at) Kraken dot io, or directly to the author of this plugin.

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Tags: anigif, compress image, exif, image optimizer, image resize, jpg, media, Optimization, optimize, optimize animated gif, optimize gif, optimize jpeg, optimize png, PageRank, PageSpeed Insights, performance, photos, png, Reduce Image Size, retina, seo, sitespeed, speed up site, svg, upload



Requires: 3.0.1 or higher
Compatible up to: 4.5.3
Last Updated: 3 months ago
Active Installs: 10,000+

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