HTTP/3 vs PDF.js

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

Top sites by authority

HTTP/3 · PDF.js · 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

HTTP/3 · PDF.js · share of sites in each country using one or the other

United States 1,137,483

15,609

India 533,896

10,085

Brazil 409,200

6,038

United Kingdom 387,999

6,618

Indonesia 291,484

4,187

Germany 286,932

6,445

Italy 284,574

4,647

Canada 281,458

5,369

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 HTTP/3 sites · All PDF.js sites