Best free image optimization plugins for WordPress
The most popular free image optimization plugins for WordPress in November 2026, in WordPress.org’s own popular order, which follows active installs. reSmush.it leads with 100K+ active installs, ahead of Opti MozJpeg Guetzli WebP (90+). All 2 plugins tagged “free image optimization” are below, with figures from WordPress.org that update every day.
Installs aren’t everything: a recent release, a “Tested up to” that matches the current WordPress, and support threads that get resolved show a plugin is looked after. Open any plugin for its downloads, rank history and alternatives.
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Top 2 free image optimization plugins
- 1.
reSmush.itThe most installed free image optimization plugin, with 100K+ active installs. Rated 4.3 from 166 reviews, updated 2 months ago.
- 2.
Opti MozJpeg Guetzli WebP90+ active installs. Rated 4.4 from 7 reviews, last updated 8 years ago. Tested only up to WordPress 4.9.35.
All 2 plugins tagged “free image optimization”
reSmush.it
Down in the last 7 days:1#364by ShortPixel2 months ago
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.
- Installs
- 100K+
- Rating
- 4.3(166)
- Downloads
- 460/day
Opti MozJpeg Guetzli WebP
Down in the last 7 days:18#17,090by ihorsl8 years ago
WordPress Opti MozJpeg Guetzli WebP - is the FREE plugin for high quality image optimization in WordPress website. It was created to meet latest requi …
- Installs
- 90+
- Rating
- 4.4(7)
- Downloads
- 0/day