wp.org search vs our merit ranking: “compress pdf”

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 “compress pdf”, we agree with wp.org on the top plugin, and our order differs from theirs on 9 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 it throws errors on current PHP, whether the install base is organic or host-pushed, and its risk of being pulled.

Ranked above its merit

PDF Compressor & Watermark – iLovePDF shows at wp.org #4 but places #17 on merit, a gap of 13 places. Its 500+ installs carry it up the search order; its 3.4★ average from 5 reviews, plus freshness and upkeep, place it lower on our volume-weighted scale.

Buried gem

File Manager places #12 on merit, 4.3★ from 202 reviews, but shows at wp.org #24. A smaller install base keeps it further down the default search order than its quality signals alone would.

merit plugin signals wp.org

Imagify Image Optimization: Optimize Images | Compress & Convert to WebP/AVIF 900K+ · 4.3★ (1656) wp.org #1 2

WP Compress – Instant Performance & Speed Optimization 9K+ · 4.5★ (155) wp.org #2 3

EWWW Image Optimizer 1M+ · 4.8★ (1842) wp.org #5 ↑1 2 too low 4

ShortPixel Image Optimizer – Optimize Images, Convert WebP & AVIF 300K+ · 4.5★ (830) wp.org #6 ↓1 2 too low 5

Optimole – Optimize Images | Convert WebP & AVIF | CDN & Lazy Load | Image Optimization 200K+ · 4.7★ (640) wp.org #10 5 too low 6

Kraken.io Image Optimizer – Compress, Convert to WebP & AVIF, Resize & Bulk Optimize 10K+ · 4.5★ (119) wp.org #8 2 too low 7

ThumbPress – Compress Images, Manage Thumbnails, Detect Image Issues, WebP/AVIF, Lazy Loading, Hotlinking & More 20K+ · 3.7★ (117) wp.org #7 8

FileBird – WordPress Media Library Folders & File Manager 200K+ · 4.7★ (1125) wp.org #17 ↑5 9 too low 9

Speed Optimizer – The All-In-One Performance-Boosting Plugin 1M+ · 4.2★ (641) wp.org #11 ↑1 2 too low 10

Flipa PDF Flipbook – PDF Viewer and Page Flip Book 800+ · 5.0★ (4) thin reviews wp.org #3 7 too high 11

ImageRecycle pdf & image compression 1K+ · 4.5★ (26) wp.org #9 2 too high 12

File Manager 10K+ · 4.3★ (202) wp.org #24 12 too low 13

Image Optimizer, Resizer and CDN – Sirv 900+ · 4.9★ (265) throws errorsnot PHP-current wp.org #20 ↓1 7 too low 14

Media Library Tools – AI-Powered Rename, Clean & CSV Import/Export 2K+ · 4.7★ (14) thin reviews wp.org #12 ↓1 2 too high 15

WPSpeed – WordPress Speed, Cache & Performance Optimization (Core Web Vitals, PageSpeed 100) 2K+ · 4.9★ (40) wp.org #22 ↑2 7 too low 16

Drag and Drop Multiple File Upload for WooCommerce 5K+ · 4.9★ (20) thin reviews wp.org #16 17

PDF Compressor & Watermark – iLovePDF 500+ · 3.4★ (5) throws errorsnot PHP-current thin reviewslow rating, top placement wp.org #4 13 too high 18

AxiaChat AI – Free AI Chatbot (Answers Customers Automatically) 500+ · 5.0★ (12) thin reviews wp.org #23 5 too low 19

Royal MCP – Secure AI Connector for Claude, ChatGPT & any LLM via MCP 10K+ · 5.0★ (7) thin reviews wp.org #19 ↑1 20

DropAvif Image Optimizer – Convert WebP & AVIF | Compress Images 80+ · 5.0★ (4) thin reviews wp.org #14 6 too high 21

bunny.net – WordPress CDN Plugin 10K+ · 3.1★ (22) thin reviews wp.org #18 3 too high 22

AVIF Uploader – Upload, Display and Fix AVIF Images 4K+ · 3.4★ (5) thin reviews wp.org #13 9 too high 23

Block & Optimize PDFs – PDF.dk 30+ · 5.0★ (1) thin reviews wp.org #15 ↑2 8 too high 24

Squishly — Image & PDF Compressor & Converter 10+ · 0.0★ (0) thin reviews wp.org #21 3 too high

Merit ranking caps the install boost at 1M (wp.org leaves it uncapped), replaces the raw star average with a volume-weighted Bayesian 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.