Files
How to convert a WebM recording to MP4
There is a converter on this page that runs entirely in your browser, and three other ways to do it. Which one suits you depends on the length of the file and how much you care about keeping the original quality.
Convert here
Turn a WebM into an MP4 without leaving this page
The file is read by your browser and never uploaded, exactly like the recorder. Conversion runs at playback speed, so a two-minute clip takes about two minutes.
Re-encoding always costs a little quality, and this runs in real time. For a long recording, or when you want the original quality preserved, use ffmpeg or HandBrake as described below — both are faster and lossless-ish by comparison.
Converting on this page
The tool above reads your file, re-encodes it to MP4 and hands it back, without uploading anything. It suits short clips: conversion happens at playback speed, so a two-minute recording takes about two minutes, and the picture is re-encoded rather than copied across.
Whether it appears at all depends on your browser being able to encode MP4 directly. Chromium-based browsers and Safari can; Gecko cannot yet, so Firefox readers will see an explanation where the tool would be.
HandBrake
Free, has a normal interface, and runs on Windows, macOS and Linux. Open the file, choose an MP4 preset, and press Start. Best option if you would rather not use a terminal.
ffmpeg
One command: ffmpeg -i recording.webm recording.mp4. Add -c:v libx264 -crf 20 for finer control over quality. Fastest option if you already have it.
Your video editor
If you are editing the recording anyway, just export as MP4. Which format you get depends on your browser. Converting first and then editing re-encodes twice and loses quality for no reason.
A note on quality
Every conversion re-encodes and loses a little quality. Convert once, from the original, rather than converting a converted file.
Read next
- WebM or MP4: which you get and why
The difference between the two formats browsers produce, and which one you want.
- The recording file is too large
Why screen recordings get big, and the levers that actually reduce the size.
- How long can a browser screen recording be?
There is no time limit, but there is a practical one — and it is about memory.