Free MP4 video converter

Convert MP4 to WebM

Convert MP4 videos to WebM for free, right in your browser. Upload a .mp4 file, pick WebM from the output menu and download the converted video. Everything is re-encoded locally — no uploads, no accounts, no watermarks.

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What is MP4 to WebM conversion?

MPEG-4 (MP4) and WebM (WebM) are two popular video containers, but not every player or editor handles them all. This free converter reads your .mp4 file, decodes its streams and re-encodes them into a valid .webm file with widely supported codecs. The whole conversion runs in your browser, so your video stays private.

How it works

1Upload a .mp4 video file.
2Choose WebM from the output format menu.
3Click Download — the video is re-encoded locally in your browser.
4Save the converted .webm file. No signup needed.

Why this tool

100% private. The conversion runs entirely in your browser. Your video is never uploaded to a server.
Free, no signup. No accounts, no watermarks, no file size limits. Convert as many videos as you like.
7 output formats. Pick AVI, FLV, MKV, MOV, MP4, WebM or WMV from the dropdown when you download.

Frequently asked questions

Is converting MP4 to WebM free?

Yes. This tool is completely free with no limits, watermarks or sign-up requirements.

Are my videos uploaded to a server?

No. The conversion happens entirely in your browser with ffmpeg.wasm, so your MP4 file never leaves your device.

How do I convert MP4 to WebM?

Upload a .mp4 file, choose WebM from the output menu, click Download and wait for the local re-encode to finish.

What output formats can I choose?

AVI, FLV, MKV, MOV, MP4, WebM, WMV — the dropdown next to Download switches between them.

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