Image Optimizer vs reSmush.it (October 2026)
Updated October 22, 2026 · Data from WordPress.org, refreshed daily · How this works
Both rank in the WordPress.org Image Optimization Plugins top 10: Image Optimizer at #4 and reSmush.it at #10. Image Optimizer leads on 4 of the 6 measures we track. Every number below comes straight from WordPress.org and is refreshed every day.
Image Optimizer
Image Optimizer – Compress Images and Convert to WebP or AVIF
Image Optimizer is an easy-to-use WordPress plugin that reduces image size through various compression and resizing techniques – all of which preserve …
reSmush.it
reSmush.it : The original free image compressor and optimizer plugin
reSmush.it is the FREE image compressor and optimizer plugin - use it to optimize your images and improve the SEO and performance of your website.
Who leads on what
Image Optimizer leads on 4 of the 6 measures we track.
Image Optimizer ranks higher on WordPress.org: #4 against #10 in Image Optimization Plugins.
Image Optimizer has more users: 1 million+ active installs against 100,000+.
reSmush.it is rated higher: 4.3 out of 5 from 166 reviews, against 1.7 from 80 reviews.
reSmush.it has more reviews behind its score: 166 against 80.
Image Optimizer was updated more recently, on September 22, 2026; reSmush.it on August 20, 2026.
Image Optimizer was downloaded more in the last 30 days: 681,303 times against 13,056.
Which one to pick
Each plugin is the better answer for the measure it actually leads on. Nothing here is a recommendation we invented.
Image Optimizer
Pick Image Optimizer if you go by where WordPress.org itself puts them, you want the plugin more sites already run, you want the one shipping releases most recently or you want the one being installed faster right now.
reSmush.it
Pick reSmush.it if the review score matters most to you or you want the score backed by more reviews.
Image Optimizer vs reSmush.it side by side
| Image Optimizer | reSmush.it | |
|---|---|---|
| Image Optimization Plugins ranking | #4 | #10 |
| Rating | 1.7 | 4.3 |
| Reviews | 80 | 166 |
| Active installs | 1 million+ | 100,000+ |
| Total downloads | 16,370,234 | 3,605,627 |
| Downloads, last 30 days | 681,303 | 13,056 |
| Last updated | Sep 22, 2026 | Aug 20, 2026 |
| First published | Jan 8, 2024 | Jul 1, 2016 |
| Tested up to WordPress | 7.0.7 | 7.1.3 |
| Requires PHP | 7.4 | 7.4 |
| Pricing | Free on WordPress.org | Free on WordPress.org |
Downloads per day, last 48 days
Image Optimizer ratings
reSmush.it ratings
How we compare these two
Every figure here is pulled from the WordPress.org plugin API every day at 03:00 UTC, for both plugins in the same run, so the two are always read on the same day. We compare only what the directory reports: active installs, the rating and how many reviews stand behind it, the last release date and, once we have a month of history, downloads over the last 30 days. Ratings are only called a win above 50 reviews each, because a handful of five-star reviews is not evidence. Nothing is weighted into an overall score, no measure is worth more than another, and neither Image Optimizer nor reSmush.it can pay to appear here: the pair exists only because both plugins reached the Image Optimization Plugins top 10. Full methodology.
Image Optimizer vs reSmush.it: common questions
Is Image Optimizer better than reSmush.it?
Image Optimizer leads on 4 of the 6 measures we track. Neither is better at everything, and the answer depends on which measure you weigh. Image Optimizer ranks higher on WordPress.org: #4 against #10 in Image Optimization Plugins.
Which has more users, Image Optimizer or reSmush.it?
Image Optimizer ranks higher on WordPress.org: #4 against #10 in Image Optimization Plugins.
Which is rated higher, Image Optimizer or reSmush.it?
Image Optimizer has more users: 1 million+ active installs against 100,000+.
Are Image Optimizer and reSmush.it free?
Both are free to install from WordPress.org. Image Optimizer may also sell a paid version or add-ons. reSmush.it may also sell a paid version or add-ons.
Alternatives to Image Optimizer and reSmush.it
Plugins that score close to both in the same WordPress.org rankings and tags.
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What moved this week
One email a week, built from the same daily snapshots these rankings come from: the plugins that climbed, what launched, and one ranking worth a look.