GoKawiilCommunity-maintained gist catalogs YouTube's video/audio format itags
A publicly shared reference document lists nearly all known YouTube format IDs (itags) covering DASH video and audio streams across codecs like AV1, VP9, and H.264. Originally created by AgentOak in 2019, the gist has been maintained and expanded by Martin Eesmaa since 2022, with updates as recent as August 2026.
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This resource is widely used by developers building downloaders, media tools, and yt-dlp-adjacent projects that need to map YouTube's opaque numeric format codes to actual resolutions, codecs, and frame rates. Because YouTube doesn't officially document these itags, community-maintained references like this one fill a critical gap for anyone programmatically handling YouTube media streams.
- The gist documents YouTube's itag system spanning resolutions from 144p to 4320p across multiple codecs.
- High-frame-rate (HFR) and AV1 HDR variants are limited to certain video types or popularity levels.
- Maintenance has passed from original creator AgentOak to Martin Eesmaa, who continues updating it as of 2026.
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Published there as: “YouTube Format IDs”
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