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wp.org search vs our merit ranking: “optimize webp images”

wp.org orders by popularity, so a plugin a host bundled onto millions of sites, or a big-brand one that's slow and mediocre, can sit at the top. Our ranking is built to answer a different question: which of these is actually worth installing. How this works →

For “optimize webp images”, we agree with wp.org on the top plugin, and our order differs from theirs on 8 of the top 20. 1 plugin is pushed down for signals wp.org ignores: errors, a host-installed base, or removal risk.

wp.org search ranks on

Install count (uncapped), the raw star average, freshness, and support. Popularity dominates, so the biggest install base usually wins regardless of how it got there.

We add

A cap on the install boost, volume-weighted ratings, and signals wp.org can't see: whether the install base is organic or host-pushed, and its risk of being pulled.

Ranked above its merit

Image Optimizer – Compress Images and Convert to WebP or AVIF shows at wp.org #13 but places #24 on merit, a gap of 11 places. Its 1M+ installs carry it up the search order; its 1.7★ average from 81 reviews, plus freshness and upkeep, place it lower on our volume-weighted scale.

Buried gem

Perfect Images: Regenerate Thumbnails, Image Sizes, WebP & AVIF places #12 on merit, 4.8★ from 279 reviews, but shows at wp.org #16. A smaller install base keeps it further down the default search order than its quality signals alone would.

How this rank is calculated

Each plugin's merit score multiplies these inputs together: how recently it was updated, how current its "tested up to" WordPress version is, its install base (log scale, capped at 10 million), its support thread resolution rate, and a rating score. The rating score weights the star average by review volume against a sitewide prior, then scales it by the lower bound of the share of 4 and 5 star reviews. A plugin with 3.7 stars from tens of thousands of reviews can still outscore a 4.9 with a few dozen, because the small sample carries less certainty.

A health factor between 0.4 and 1.15 then adjusts that score for what wp.org's search can't see: PHP fatals or failed activations on a test install, PHP and WordPress compatibility, memory and page-speed footprint, suspicious review patterns, closure risk, and a large install base with very few reviews. Clean, adopted plugins earn a small lift.

A keyword ranking starts from wp.org's search order for the term, weighting each position by 1 divided by its place, then applies the merit correction and health factor above. Relevance to the keyword stays in the result, so the order can differ from the all-categories list on /best, which scores plugins with no search term.

Hover a row to see the main reason for its position.

merit plugin wp.org
1 WP-Optimize – Cache, Compress images, Minify & Clean database to boost page speed & performance 1M+ · 4.8★ (2,617) wp.org #1 2 Converter for Media – Optimize images | Convert WebP & AVIF 500K+ · 4.9★ (1,108) wp.org #2 3 Smush – Image Optimization, Compression, Lazy Load, WebP & CDN 1M+ · 4.8★ (6,053) wp.org #3 4 Imagify Image Optimization: Optimize Images | Compress & Convert to WebP/AVIF 900K+ · 4.3★ (1,657) wp.org #4 5 ShortPixel Image Optimizer – Optimize Images, Convert WebP & AVIF 300K+ · 4.5★ (830) wp.org #5 6 EWWW Image Optimizer 1M+ · 4.8★ (1,844) wp.org #6 7 Optimole – Optimize Images | Convert WebP & AVIF | CDN & Lazy Load | Image Optimization 200K+ · 4.7★ (640) wp.org #7 8 WP Fastest Cache – WordPress Cache Plugin 1M+ · 4.9★ (4,230) wp.org #9 ↑3 wp.org ranks it 1 place below merit 9 LiteSpeed Cache 7M+ · 4.8★ (2,778) wp.org #11 ↑4 wp.org ranks it 2 places below merit 10 WebP Express 300K+ · 4.4★ (162) wp.org #8 wp.org ranks it 2 places above merit 11 TinyPNG Image Optimization – Image Compression JPEG & PNG | Convert to WebP & AVIF 100K+ · 4.5★ (181) wp.org #10 ↓1 wp.org ranks it 1 place above merit 12 Perfect Images: Regenerate Thumbnails, Image Sizes, WebP & AVIF 60K+ · 4.8★ (279) wp.org #16 ↓3 wp.org ranks it 4 places below merit 13 Autoptimize 800K+ · 4.7★ (1,428) wp.org #17 ↑6 wp.org ranks it 4 places below merit 14 CompressX — AVIF & WebP Converter, Media Replacement 40K+ · 5.0★ (197) wp.org #19 ↑2 wp.org ranks it 5 places below merit 15 Robin Image Optimizer – Unlimited Image Optimization, WebP & AVIF 100K+ · 4.4★ (132) wp.org #14 wp.org ranks it 1 place above merit 16 W3 Total Cache 900K+ · 4.4★ (5,420) wp.org #24 wp.org ranks it 8 places below merit 17 ShortPixel Adaptive Images – WebP, AVIF, CDN, Image Optimization 10K+ · 4.8★ (145) wp.org #20 ↓1 wp.org ranks it 3 places below merit 18 Images to WebP 9K+ · 4.4★ (32) wp.org #12 ↓2 wp.org ranks it 6 places above merit 19 Kraken.io Image Optimizer – Compress, Convert to WebP & AVIF, Resize & Bulk Optimize 10K+ · 4.5★ (119) wp.org #23 ↑1 wp.org ranks it 4 places below merit 20 Auto Upload Images 20K+ · 4.3★ (106) wp.org #22 wp.org ranks it 2 places below merit 21 JCH Optimize 4K+ · 4.4★ (69) wp.org #18 ↓1 wp.org ranks it 3 places above merit 22 Cimo – Free Instant Image Optimizer & WebP Converter 10K+ · 4.9★ (20) wp.org #21 ↓1 wp.org ranks it 1 place above merit 23 LWS Optimize – All-in-One Speed Booster & Cache Tools 20K+ · 4.6★ (9) wp.org #15 ↑1 wp.org ranks it 8 places above merit 24 Image Optimizer – Compress Images and Convert to WebP or AVIF 1M+ · 1.7★ (81) wp.org #13 ↓2 wp.org ranks it 11 places above merit

Merit ranking caps the install boost at 10M (wp.org leaves it uncapped), replaces the raw star average with a volume-weighted score and a Wilson lower bound, and keeps wp.org's own freshness and compatibility decays. Method from the plugin-directory source; see Meta Trac #8298. Positions are tracked daily from the first visit to a keyword, so the small arrows show movement since tracking began.