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 15,476

887,410

India 9,983

336,391

Germany 6,438

333,621

Japan 3,532

319,148

United Kingdom 6,236

282,220

France 5,600

267,086

Brazil 5,953

265,509

Italy 4,442

258,995

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, Aug 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