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Best WordPress Plugins for Optimising Images with Conversions

8 plugins compared · Updated September 2026 · Image Optimisation

Choosing a WordPress plugin for optimising images comes down to a few things: whether it is still actively maintained, whether real users rate it well, and whether it does the specific job you need without dragging the rest of the site down.

We ranked 8 plugins using our WPScore, which weighs the user rating (adjusted for how many people actually rated it), how many sites run it, how recently it was updated, and which WordPress version it is tested against. 8 of them have enough public data to be scored; the rest are listed below the ranked block, clearly marked, rather than being given a number we cannot justify.

How this list is funded. Some links here earn us a commission if you buy. It costs you nothing extra, and it does not move anything up the list — the order comes from the WPScore, which is calculated from public ratings, install counts and update history. See the method.

At a glance

  1. 1. Optimole Best overall 89/100
  2. 2. LWS Optimize 85/100
  3. 3. Cimo 84/100
  4. 4. HEIC Support 83/100
  5. 5. Squeeze 82/100
  6. 6. Soovex WebP Converter 76/100
  7. 7. Toolszu Image Optimizer 76/100
  8. 8. WebP Conversion 75/100
1 Optimole
Best overall Free by Optimole

Optimole

Automatically optimize images with bulk compression, lazy loading, WebP/AVIF conversion & CloudFront image CDN. Boost Core Web Vitals & conversions.

4.7★
from 638 ratings
200k+
active installs
Updated
Aug 2026
Tested to
WP 7.1
89

WPScore

Read review View on WordPress.org
2 LWS Optimize
Free by Aurélien LWS

LWS Optimize

All-in-one speed optimization: caching, WebP/AVIF, Critical CSS, lazy loading, CDN, and more. Instantly boost Core Web Vitals and site speed!

4.6★
from 9 ratings
20k+
active installs
Updated
Aug 2026
Tested to
WP 7.0.4
85

WPScore

Read review View on WordPress.org
3 Cimo
Free by Benjamin Intal

Cimo

Unlimited free image compression and WebP conversion, done instantly as you upload them. No quotas, no external servers, no limits.

4.9★
from 16 ratings
10k+
active installs
Updated
Aug 2026
Tested to
WP 7.0.4
84

WPScore

Read review View on WordPress.org
4 HEIC Support
Free by Corey Salzano

HEIC Support

Add iPhone .heic photos to WordPress and auto-create .webp, .avif, or .jpg copies. Free forever on thousands of sites; optional cloud conversion for a …

5★
from 3 ratings
5k+
active installs
Updated
Jul 2026
Tested to
WP 7.0.4
83

WPScore

Read review View on WordPress.org
5 Squeeze
Free by Bogdan Bendziukov

Squeeze

Compress images in WordPress & convert to WebP — no API key, no quotas, no cloud. Unlimited local image optimizer; private browser-side compression.

5★
from 6 ratings
3k+
active installs
Updated
Aug 2026
Tested to
WP 7.1
82

WPScore

Read review View on WordPress.org
6 Soovex WebP Converter
Free by Soovex IT Agency

Soovex WebP Converter

Convert WordPress images to WebP automatically. Optimize page speed, boost SEO, and reduce bandwidth with unlimited conversions and smart backups.

5★
from 1 ratings
100+
active installs
Updated
Aug 2026
Tested to
WP 7.0.4
76

WPScore

Read review View on WordPress.org
7 Toolszu Image Optimizer
Free by Toolszu

Toolszu Image Optimizer

Toolszu Image Optimizer is a lightweight WordPress image compression, resizing, and WebP conversion plugin designed for content writers, bloggers, and …

5★
from 1 ratings
100+
active installs
Updated
Jun 2026
Tested to
WP 7.0.4
76

WPScore

Read review View on WordPress.org
8 WebP Conversion
Free by sheepfish

WebP Conversion

Convert your .png and .jpeg images to WebP format for FREE – with absolutely NO limits or hidden restrictions.

4.3★
from 6 ratings
3k+
active installs
Updated
Feb 2026
Tested to
WP 6.9.7
75

WPScore

Read review View on WordPress.org