WebCodecs Codec Support Dataset

WebCodecs Codec Support Dataset

This dataset contains real world audio and video codec support data from over  1,142,586 real user sessions at free.upscaler.video using the WebCodecs API to detect both encoding and decoding support for over 1000+ codec variants across the following audio and video codecs:

Video:

• h264
• h265
• vp8
• vp9
• av1

Audio:

• aac
• pcm
• opus
• vorbis
• mp3
• flac

The data is compiled and summarized on the project website ,webcodecsfundamentals.org, which provides a global overview of real world support for codecs like AV1 or h265, across operating systems and browsers.

This dataset contains the underlying data used, with 363 million codec compatability tests from unique 1.14 million user sessions.

CSV SCHEMA

timestamp          - ISO 8601 timestamp of when test was performed
user_agent         - Full browser user agent string
browser            - Browser family (Chrome, Safari, Edge, Firefox, Unknown)
platform_raw       - Raw platform identifier from navigator.platform
platform           - Normalized platform (Windows, macOS, iOS, Android, Linux)
codec              - WebCodecs codec string tested (e.g., "av01.0.01M.08")
encoder_supported  - Whether VideoEncoder supports codec (true/false)
decoder_supported  - Whether VideoDecoder supports codec (true/false/empty)

EXAMPLE ROWS

2026-01-05T00:54:11.570Z,"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36...",Edge,Win32,Windows,av01.0.01M.08,true,
2026-01-16T23:58:08.560Z,"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36...",Chrome,Win32,Windows,avc1.64040c,false,true

Note: decoder_supported is empty for sessions before Jan 14, 2026. The second
example shows a codec that can decode but not encode.

QUICK STATS

Total Tests:       363,330,358
Sessions:          1,142,586
Unique Codecs:     1,087
Collection Period: January 2026 - March 2026
Data Source:       free.upscaler.video
Encoder Data:      All 1,142,586 sessions
Decoder Data:      Sessions from Jan 14, 2026 onwards

PLATFORM NORMALIZATION

The 'platform' column applies the following normalization:
  Win32, Win64 → Windows
  MacIntel → macOS
  iPhone, iPad → iOS
  Linux armv8*, Android* → Android
  Linux x86_64, Linux aarch64 → Linux

The 'platform_raw' column contains the original navigator.platform value.

LICENSE
Creative Commons Attribution 4.0 International (CC-BY 4.0)

You are free to:
- Share and redistribute in any format
- Adapt, remix, and build upon the data
- Use commercially

Under the following terms:
- Attribution: Credit "upscaler.video Codec Support Dataset" with link

Full license: https://creativecommons.org/licenses/by/4.0/