SureRec

WebM to MP4 converter

Turn a WebM video into a real MP4 that opens everywhere. It runs in your browser: the file is never uploaded, there is no watermark and no sign-up.

The file stays on your computer.

Tired of converting? Record straight to MP4

If the WebM came from a screen recorder, SureRec saves a real MP4 from the start, so there is nothing to convert. It is a free Chrome extension with no watermark and no account, and it never loses a recording to a crash.

Add to Chrome, it's free

How it works

  1. Choose the WebM file, or drop it on the box above.
  2. Press Convert to MP4. In Chrome and Edge you first choose where to save the result.
  3. Wait for the bar to finish. The MP4 has H.264 video and AAC audio, at the same resolution and frame rate.

Questions

Is my video uploaded?

No. The conversion runs inside your browser. The file is read from your disk and the MP4 is written back to your disk.

Is there a file size limit?

We set none. In Chrome and Edge the MP4 is written straight to the file you choose, so large videos work. In other browsers the result has to fit in memory.

Will I lose quality?

WebM and MP4 use different video codecs, so the video has to be encoded again. At the High or Best setting the difference is hard to see. The resolution and frame rate stay the same.

Why will my WebM file not open?

Many screen recorders save WebM, and Windows Media Player, QuickTime, iPhones and most video editors do not read it. MP4 with H.264 video and AAC audio opens almost everywhere.

Does it convert other formats?

It is made for WebM, and it also reads MKV and MOV files. The result is always an MP4.

Need to record your screen?

Use the free online screen recorder. It saves MP4 directly.

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