PDF.js vs RSS

Head-to-head usage across the sites we track.

Top sites by authority

PDF.js · RSS · how many of each technology's sites sit in the web's highest authority tiers

Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.

By country

PDF.js · RSS · share of sites in each country using one or the other

United States 15,609

865,432

India 10,085

329,297

Germany 6,445

327,527

Japan 3,536

314,790

United Kingdom 6,618

281,660

France 5,813

271,657

Italy 4,647

272,529

Brazil 6,038

255,443

Audience countries from the Chrome UX Report, top markets of either technology.

Real user performance

Median site's p75 values from the Chrome UX Report, Sep 2026. Lower is better; green meets Google's "good" threshold. This describes the sites that use each technology, not the technology's own overhead.

Sites that switched

Domains that dropped one technology and adopted the other within about a year, data nobody else gives away free.

All PDF.js sites · All RSS sites