Matroska media container, including WebM — file signature 1A 45 DF A3 at offset 0

For Matroska media container, including WebM, hex signature is 1A 45 DF A3; offset is 0; extension is mkv mka mks mk3d webm, verified against its source on 2026-09-22.

What the source says

1A 45 DF A3 | ␚Eߣ | 0 | mkv mka mks mk3d webm | Matroska media container, including WebM |

— en.wikipedia.org, retrieved 2026-09-22

Source

• en.wikipedia.orghttps://en.wikipedia.org/wiki/List_of_file_signatures

Last verified against source: 2026-09-22. Due for re-check by 2027-09-22. This page as Markdown · OKF bundle · full dataset as JSON.