WebM to MP4 Converter
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Free WebM to MP4 Converter

Convert WebM videos to MP4 right in your browser. The video is converted to H.264 with AAC audio, the MP4 that iPhones, editing apps and upload forms accept. No sign-up, no watermark, and your video never leaves your device.

No file handy?

Drop your WebM video here

or click to browse — screen recordings and downloaded WebM videos

Your video never leaves your device. The conversion runs entirely in your browser. Privacy policy.

Large videos take a few minutes to convert. Keep this tab open until it finishes.

Need a different format? Use the all-in-one converter — video, audio and image formats in one tool.

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About WebM to MP4 conversion

WebM is the open video format browsers use. You get it from browser-based screen recorders, web downloads and some messaging apps. Outside the browser it is less welcome: the iPhone Photos app, many editing apps and a lot of upload forms expect MP4. Converting WebM to MP4 here re-encodes the video to H.264 with AAC audio, which plays almost everywhere.

How to convert WebM to MP4

What people use it for

Good to know: WebM files that use the AV1 codec, which some newer downloads do, cannot be read by this converter yet. VP8 and VP9 WebM files, the usual kind, convert normally. Large videos take a few minutes.

Why SnipSound

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Frequently Asked Questions

How do I convert WebM to MP4?▼
Drop your WebM file onto the page and click Convert to MP4. The video is converted to H.264 with AAC audio, then you preview the MP4 and download it. Everything runs in your browser, and your video never leaves your device.
Why did my WebM file fail to convert?▼
The most likely reason is the AV1 codec, which some newer WebM downloads use and this converter cannot read yet. WebM files using VP8 or VP9, the usual kind, convert normally.
Does converting WebM to MP4 lose quality?▼
The video is re-encoded, so it is not a bit-for-bit copy, but it stays close to the original for normal viewing.
How long does it take?▼
Small clips take seconds. Because the video is re-encoded, large files take a few minutes, and 1080p or 4K video takes longer than lower resolutions. Keep the tab open until it finishes.
Is my video uploaded to a server?▼
No. The conversion runs on your own device using FFmpeg compiled to WebAssembly, so your video never leaves your device.
Is there a file size limit?▼
No fixed cap. In our testing a 1 GB file converted on a desktop computer and on a mid-range Android phone. iPhones give browsers less memory, so very large files may fail there.