Kraken.io Image Optimizer
This plugin allows you to optimize your WordPress images through the Kraken.io API, the world's most advanced image optimization and resizing API.
4.5(119 reviews)
·10K+ active installs·Updated 1 month agoAs of April 2026, Kraken.io Image Optimizer is a WordPress exif plugin with 10K+ active installations and a 4.5/5 rating from 119 reviews. It has been downloaded 399K+ times in total. Requires WordPress 4.9+ and PHP 5.6+. Available on WordPress.org since 2014. Actively maintained — updated within the last month. Download volume is stable this week. Top alternative: Meow Lightbox.
4.5/5119 reviews
10K+active installs
399K+total downloads
12 yearssince 2014
Overview
This plugin allows you to optimize and resize new and existing WordPress image uploads through Kraken.io Image Optimizer’s API. Both lossless and intelligent lossy optimization modes are supported. Supported filetypes are JPEG, PNG and GIF (including animated GIF). Maximum filesize limit is 32 MB. Even when using Kraken.io’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 Kraken.io.
Get your FREE account with us, or a subscription starting from just USD $5 per month
Sign up for your FREE Kraken.io Account and try out our plugin with and the rest of our features now, including:
- …
Screenshots
Ratings & Reviews
4.5119 reviews
5 ★
100
4 ★
6
3 ★
1
2 ★
2
1 ★
10
Recent Reviews
Poor Quality
by blieben·4 years ago
Not worth the time.
Terrible Customer Service
by David Artiss·4 years ago
As others are noting here, their customer service is terrible. In fact I’d use the word “non-existent”.
After signing up with an account I decided that the service was no longer what I needed and contacted them to delete my account. Multiple times, in different ways, I’ve contacted their customer support about this and never had a response. Currently breaching GDPR rules, they’re going to be reported.
Thank goodness I never handed over any payments to them.
Worst service I’ve encountered
by yoavshai·4 years ago
Whatever you do, do not use this service. They will happily charge your credit cars, but when you try to reach them for support, they never respond. Their service is a disgrace.
No support at all, broken plugin
by msstm·5 years ago
I put 2 stars because it was fine for a while but now there is no update for over a year.
There is no response from support. It doesn’t matter to the developer, he seems to keep taking the money and not care if stuff works or not. Very annoying.
I am planning to migrate elsewhere, I don’t think that the developer is working on anything for many many many months.
- This topic was modified 2 years, 3 months ago by msstm.
Does not work for bulk actions, subscription cannot be cancelled
by Trac Nguyen·7 years ago
– It works with 1 image but not at Google PageSpeed standard
– It doesn’t work with bulk action
– The worst thing is I inputted my credit card there and they refused to let me cancel my subscription, what a very bad thing from kraken.io
Download Trends
Today: 84Yesterday: 109This week: 611Period total: 16K
Compatibility
| WordPress | 4.9+ requiredTested up to 6.7.5 |
| PHP | 5.6+ required |
Version Adoption
v2.6
69.1%
v2.7
30.0%
Other
0.9%
Top Alternatives to Kraken.io Image Optimizer
Frequently Asked Questions
Changelog
2.7.0
- Complete plugin rewrite with modular OOP architecture
- Added WebP image generation and display support
- Added background processing for image optimization
- Added support for WP Retina 2x, NextGen Gallery, and WP Offload Media
- Security: Added capability and nonce checks to reset_all_images AJAX handler
…and 11 more changes
Contributors
Plugin data sourced from WordPress.org. Analysis and metrics by PluginSift.