Converter//API

Convert

Convert MP4 to WebM

H.264 video with AAC audio in an MP4 container. VP9 video with Opus audio for the web.

  • Free to use — no account or signup required.
  • Your file is deleted the moment the conversion finishes.
  • Handles large files — up to 1 GB per conversion.
  • Prefer code? The same conversion is one API call away.

Related conversions

AVI → WebMFLV → WebMGIF → WebMMKV → WebMMOV → WebMMP4 → FLAC
io bay · MP4 → WebM
Input · MP4

Idle

Questions

faq

How do I convert MP4 to WebM?

Upload or paste your MP4 file, press Convert, and download the WebM result. It's free and no account is required.

Is my file kept after conversion?

No. Your uploaded file is deleted the moment the conversion finishes, and the converted output expires shortly after.

Can I run this conversion over an API?

Yes. The same MP4 to WebM conversion is available as a REST API.