Does YouTube Shorts support WebM files?
an open, web-native format that produces smaller files at a similar quality, popular for embedding on websites
Yes - WebM is on YouTube's own list of supported upload formats.
Unlike most platforms, YouTube explicitly supports WebM uploads - it's listed alongside MP4 and MOV in Google's official supported-formats documentation. There's no need to convert a WebM file before uploading to YouTube or Shorts.
Source: YouTube supported file formats. YouTube video uploads; Shorts also requires an eligible shape and duration. Checked 2026-09-12.
Frequently asked
Does YouTube Shorts support WebM?
Yes - WebM is on YouTube's own list of supported upload formats. Unlike most platforms, YouTube explicitly supports WebM uploads - it's listed alongside MP4 and MOV in Google's official supported-formats documentation. There's no need to convert a WebM file before uploading to YouTube or Shorts.
How do I check whether my WebM file will upload cleanly to YouTube Shorts?
Open the Koldflux File Doctor, drop in the file, and pick YouTube Shorts. It reads the container, codec, resolution, duration and file size locally and reports pass / warn / fail against the documented YouTube Shorts constraints.