Cimo — WordPress Image Optimization Plugin
Cimo – Free Instant Image Optimizer & WebP Converter
by Benjamin Intal · WordPress.org page · Website
Cimo has 10,000+ active installs on WordPress.org and 59,967 downloads all time. It was downloaded 7,330 times in the last 30 days. The last update was on October 14, 2026, tested up to WordPress 7.1.3.
Cimo at a glance
Is Cimo well maintained?
Features
The feature list from the plugin's own readme on WordPress.org, trimmed to the essentials.
- WebP quality – set the quality level for WebP conversion (1-100), defaults at 80%
- Max image dimension – automatically resize images to a maximum dimension while preserving aspect ratio
- WordPress automatic scaling – disable WordPress’s built-in 2560px image scaling
- Thumbnail generation – disable all WordPress thumbnail generation to save disk space
- Individual thumbnail sizes – selectively enable/disable specific thumbnail sizes
- Preset configurations – one-click “Recommended” settings for optimal performance
- Statistics dashboard – view total storage saved, compression ratio, and optimization metrics
Cimo reviews and ratings
19 reviews on WordPress.org, with the most recent ones as their authors posted them.
19 reviews
- 5★
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17
- 4★
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2
- 3★
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0
- 2★
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0
- 1★
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0
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Simple and does what it should
Works as expected. Images are compressed automatically on upload, so there’s nothing extra to do. Quality stays good and file sizes are noticeably smaller. Easy setup, no conflicts so far. Happy with it.
hlenaa -
I love CIMO
I've been using CIMO since the first release, and it's very reliable, effective, and FAST. No more server-side compression, this plugin is excellent. Thank you guys
Daniele -
Huge time saver
Works so well, such a time saver, one less thing I have to do when uploading non-optimized images to my site. Thank you!
liamdousti -
Truly impressed - 1.1GB saved space!
This plugin truly does what it says on the label. I admittedly use the Pro version, but it's well worth every penny. I've tried a large number of image optimisation plugins, and this just works. It does what it needs to do without any fuss. Highly recommended.
tituss -
An Essential Plugin for Every WordPress Website
Cimo is one of those plugins that makes you wonder why WordPress doesn't work this way by default.After asking the developer about how Cimo handles image optimization, I was genuinely impressed by its approach.Most image optimization plugins work after the original image has already been uploaded to the server. They often keep the original image as a backup (or worst they create a new image as a backup), generate WebP or AVIF versions from it, and then serve the optimized versions to visitors.This approach creates a major problem: the original image still exists on the server, the optimized version also exists, and depending on the plugin settings, additional backup files may also remain. Over time, this can consume a huge amount of hosting storage.Cimo takes a completely different approach.The image is optimized directly in the browser before it reaches your WordPress website. The original, unoptimized image is never uploaded to the server at all.In other words, WordPress only receives the optimized image, exactly as if you had optimized the image on your computer first and then uploaded it to the Media Library.This has a very important advantage: there is no unnecessary original image sitting on your server.WordPress then generates its normal image sizes from the optimized WebP image, while the Media Library and other WordPress functionality can continue to work with it.This is a much smarter approach to image optimization, especially for websites that will be uploading hundreds or thousands of images over time.I've tested and reviewed many plugins that claim to optimize images, but this concept is fundamentally different. Instead of uploading a large image and then trying to clean up the mess afterward, Cimo prevents the unnecessary data from ever reaching the server.For me, this makes Cimo particularly valuable as one of the first plugins to install on a new WordPress website. From the very beginning, you can have optimized images while avoiding unnecessary stor
NagaTheme -
Easy and efective
Very good performance, I feel relax!
siglotel
Download and install history
9,260 downloads over the last 49 days. Snapshots taken daily from WordPress.org.
Where Cimo ranks on WordPress.org
The rankings we track that Cimo appears in, and how its position changed over 30 days.
| Ranking | WordPress.org placement | Position | 30 days |
|---|---|---|---|
| Best Image Optimization Plugins | #23 by tag, #34 in search | #20 | ▼5 |
Cimo alternatives
Plugins that solve the same problem, ranked by how closely they overlap with Cimo.
-
EWWW Image Optimizer 1 million+ installs · 4.8 -
ShortPixel Adaptive Images 10,000+ installs · 4.8 -
CompressX 40,000+ installs · 5.0 -
Perfect Images 60,000+ installs · 4.8 -
Optimus 30,000+ installs · 4.2
Details
Unlimited free image compression and WebP conversion, done instantly as you upload them. No quotas, no external servers, no limits.
The full description, screenshots and every review live on the WordPress.org page.
Rankings Cimo competes in
Tags
- compress
- convert
- image
- optimization
- webp
More from Benjamin Intal
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- Version
- 1.5.0
- Last updated
- Oct 14, 2026
- First published
- Aug 29, 2025
- Requires WordPress
- 7.0.7
- Tested up to
- 7.1.3
- Requires PHP
- 8.0
- Pricing
- Free on WordPress.org
Cimo FAQ
What does Cimo do?
According to its WordPress.org readme, Cimo offers WebP quality – set the quality level for WebP conversion (1-100), defaults at 80%, Max image dimension – automatically resize images to a maximum dimension while preserving aspect ratio, WordPress automatic scaling – disable WordPress’s built-in 2560px image scaling, Thumbnail generation – disable all WordPress thumbnail generation to save disk space and Individual thumbnail sizes – selectively enable/disable specific thumbnail sizes.
How many active installs does Cimo have?
WordPress.org reports 10,000+ active installs for Cimo as of October 23, 2026.
Is Cimo still maintained?
Yes. The last release was on October 14, 2026 and it is tested up to WordPress 7.1.3.
Does Cimo have good support?
On the WordPress.org forum, 1 of 1 recent support threads for Cimo are marked resolved. That is the developer's free support; a paid version usually comes with its own channel.
Is Cimo free?
Cimo is free to install from WordPress.org. Many plugins also sell a paid version or add-ons.
Where does Cimo rank among Image Optimization Plugins?
Cimo is #20 in the WordPress.org Image Optimization Plugins ranking.