WebM to MP4
Convert WebM videos — from screen recorders and the web — to compatible MP4.
or drag and drop it here
No file chosen yet. Maximum size: 300 MB.
When possible the video is copied without re-encoding — instant and lossless.
Ready. Choose a file to start.
🔒 Runs 100% in your browser with FFmpeg — your file is never uploaded to a server. First use loads the converter engine (about 31 MB, cached in your browser afterwards). WebM is always re-encoded to H.264 MP4 for playback everywhere.
How to Use WebM to MP4
Follow these 3 simple steps to get started in seconds
Choose your file
Choose your WebM file (up to 300 MB).
Click Convert
Pick a quality preset and click Convert.
Download your file
Download the MP4 when it is ready.
Why use this WebM to MP4 tool?
Designed for speed, privacy, and maximum efficiency without subscriptions
WebM plays in browsers but fails in many editors, players and phones.
WebM plays in browsers but fails in many editors, players and phones.
Output is H.264 MP4
the format everything accepts.
Quality presets let you trade file size against sharpness.
Quality presets let you trade file size against sharpness.
100% private
nothing is uploaded, ever.
Frequently Asked Questions About WebM to MP4
No. Conversion runs entirely in your browser with FFmpeg. Your file never leaves your device.
The first use downloads the converter engine (about 31 MB). After that it is cached in your browser.
WebM video (VP9) and audio (Opus) do not fit the MP4 world cleanly. Re-encoding to H.264 + AAC guarantees the MP4 plays everywhere.
A little — re-encoding always costs something. The High preset keeps it minimal; Balanced is the sweet spot for sharing.
300 MB per file. Re-encoding is heavy work — long videos convert better on a desktop browser.
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Ready to Use WebM to MP4?
WebM that will not play or edit? Turn it into MP4 — free, private, no upload.