Convert mp4 to webm
Converted on your device. Files never leave this tab.
Nothing is uploaded
The converter runs inside this page. Cut your network after it loads and it still works.
No account, no daily limit
No sign-up, no daily limit, no watermark, no queue behind other people's files. Batch as many MP4 files as you like.
Real WEBM output
Encoded by your browser's own VP9 or VP8 video encoder, with Opus audio — not a renamed extension.
About MP4
MPEG-4 Part 14
An ISO container standard (ISO/IEC 14496-14) based on Apple's QuickTime format. It usually holds H.264 or H.265 video with AAC audio. Use it when a video has to play on any phone, browser, TV or editing app.
About WEBM
WebM
An open container from Google, launched in 2010 and based on Matroska, holding VP8, VP9 or AV1 video with Vorbis or Opus audio. Convert from WebM to MP4 for editors, phones and apps that handle MP4 better.