mp4a.40.2 - Codec Support | WebCodecs Fundamentals ← Back to Codec Support Table

Codec: mp4a.40.2

91.93% Encoder Support
7,038,247 of 7,655,798 sessions supported encoding
97.25% Decoder Support
7,268,645 of 7,473,829 sessions supported decoding

VideoEncoder Support Matrix

Browser × Platform encoder support from 7,655,798 test sessions. Browser detection based on user agent strings.

Browser Windows Windows macOS macOS iOS iOS Android Android Linux Linux
ChromeChrome/Chromium
 99.65% 3,079,873 / 3,090,689 99.62% 357,090 / 358,458 70.59% 12 / 17 96.97% 2,244,585 / 2,314,793 49.44% 77,197 / 156,131
SafariSafari
 — 77.52% 132,972 / 171,540 78.06% 607,369 / 778,084 — —
EdgeEdge
 99.81% 510,953 / 511,912 99.96% 5,219 / 5,221 — 99.04% 14,891 / 15,036 0.58% 14 / 2,430
FirefoxFirefox
 0.02% 45 / 190,874 0.06% 16 / 26,454 — 0.25% 1 / 395 0.3% 65 / 21,432

VideoDecoder Support Matrix

Browser × Platform decoder support from 7,473,829 test sessions. Decoder data collection started Jan 2026.

Browser Windows Windows macOS macOS iOS iOS Android Android Linux Linux
ChromeChrome/Chromium
 99.98% 3,009,896 / 3,010,587 99.8% 344,684 / 345,360 76.47% 13 / 17 100.0% 2,279,295 / 2,279,340 98.96% 150,275 / 151,850
SafariSafari
 — 78.25% 130,397 / 166,635 78.56% 595,597 / 758,104 — —
EdgeEdge
 99.99% 497,679 / 497,709 100.0% 5,072 / 5,072 — 100.0% 14,763 / 14,763 99.13% 2,387 / 2,408
FirefoxFirefox
 99.94% 184,421 / 184,533 99.96% 25,613 / 25,624 — 0.55% 2 / 363 98.34% 20,253 / 20,595