TLS 1.3, PQC, HSTS and HTTP/3 over time

Monthly series across the top 1,000,000 websites as of each run.

0%23%45%68%90%2026-092026-10TLS 1.3 adoption · 2026-09: 89.2%TLS 1.3 adoption · 2026-10: 89.5%89.5%89.2%Post-quantum key exchange · 2026-09: 60%Post-quantum key exchange · 2026-10: 61.3%61.3%60%HSTS adoption · 2026-09: 33.8%HSTS adoption · 2026-10: 34.4%34.4%33.8%HTTP/3 advertisement · 2026-09: 42%HTTP/3 advertisement · 2026-10: 45.2%45.2%42%
TLS 1.3 adoptionPost-quantum key exchangeHSTS adoptionHTTP/3 advertisement

Denominators: deep-scanned websites / websites — each measure states its own

View as table
RunTLS 1.3 adoptionPost-quantum key exchangeHSTS adoptionHTTP/3 advertisement
2026-0989.2%60%33.8%42%
2026-1089.5%61.3%34.4%45.2%

Source: GeoTrust Research — The State of SSL/TLS, October 2026