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Convert WebM to MP4

Convert WebM to MP4 online free. Fast, private and in your browser — no upload, no sign-up and no watermark. Batch WebM→MP4 conversion that works on any device.

Runs in your browser — your files are never uploaded.Last updated: June 1, 2026

To convert WebM to MP4, drop your WebM file into the converter above, then download the MP4 result. It's free, needs no sign-up, and there's no watermark. Conversion runs in your browser with on-device FFmpeg, so your files never leave your device.

Why convert WebM to MP4?

Convert WebM to MP4 to make web-downloaded video play everywhere. WebM is great on the web but many editors, phones and social apps prefer MP4 (H.264) — converting gives you a clip that uploads cleanly to YouTube, Instagram and TikTok.

  • Editing a downloaded WebM in software that wants MP4.
  • Uploading to platforms that prefer H.264.
  • Playing web video on phones and TVs.

WebM vs MP4

WebM · WebM (VP9)

WebM is an open, royalty-free format designed for the web. VP9 video gives smaller files than H.264 at similar quality and is ideal for embedding directly on a site.

MP4 · MPEG-4 Part 14 (H.264)

MP4 with H.264 video is the most universally compatible video format — it plays everywhere and uploads cleanly to YouTube, Instagram, TikTok and messaging apps.

Need more options?

Video Converter

Convert video to MP4, WebM, MOV, MKV, GIF or MP3.

Open Video Converter

WebM to MP4 — frequently asked questions

How do I convert WebM to MP4?

Drop your WebM file (or several) into the converter, confirm MP4 is selected as the output, click convert, then download the MP4 file. The whole thing takes a few seconds.

Is this WebM to MP4 converter free?

Yes — it's completely free with no watermark and no sign-up required.

Is it safe to convert WebM to MP4 here?

Yes. Conversion runs on-device with FFmpeg compiled to WebAssembly, so your WebM file is never uploaded to a server.

Can I convert multiple WebM files at once?

Add your WebM file and convert it, then repeat for the next one — each runs locally in your browser.

Does it work on mobile?

Yes — the converter runs in any modern browser on phones, tablets and desktops.

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