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Video Converter

Change a video between MP4, MOV, WebM and MKV, copying the picture and sound as they are whenever the new format can hold them.

Runs locally in your browser – your data is not uploaded

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About the Video Converter

The Video Converter changes a video between MP4, MOV, WebM and MKV. Use it to turn an iPhone MOV or a screen recording in MKV into an MP4 that plays everywhere, or an MP4 into WebM for a website.

Before you start, it tells you what will happen. When the new format can hold the picture and the sound as they are, they are copied: that takes seconds, whatever the length of the video, and the quality stays exactly the same. Otherwise they are encoded again, which takes longer and loses a very little quality.

Everything happens in your browser with WebCodecs. The video is never uploaded, so even long or private recordings stay on your device.

How to use it

  1. Choose a video file: MP4, MOV, WebM or MKV, up to 4 GB.
  2. Choose the format to convert to.
  3. Read what will happen to the picture and the sound: copied as it is, or encoded again.
  4. Press Convert video and wait for the progress bar. You can cancel at any time.
  5. Watch the result if your browser can play it, then download it.

Features

  • Copies when it can: H.264 or HEVC video and AAC or MP3 sound go into MP4 and MOV as they are; VP8, VP9 and AV1 with Opus or Vorbis go into WebM as they are.
  • Says what it will do: You see beforehand whether the picture and the sound are copied or encoded again, and how long it may take.
  • Phone videos stay upright: A video turned by its rotation setting keeps it in MP4 and MOV, and is turned in the picture itself for WebM and MKV.
  • Large files: Videos up to 4 GB are read straight from the file. The new file is kept in memory until you download it, so very large videos need a device with plenty of memory.
  • Private: The conversion runs in your browser. Nothing is uploaded.

Examples

iPhone video to MP4

Convert a MOV from an iPhone to MP4: the H.264 or HEVC picture and AAC sound are copied in a few seconds.

Screen recording

Turn an MKV screen recording into MP4 to share it in a chat app that does not take MKV.

A clip for a website

Convert an MP4 into WebM with VP9 and Opus for a web page.

Limitations and notes

  • Converting to WebM, or from VP9 or AV1 to MP4 or MOV, encodes the picture again, which takes about as long as the video plays or longer.
  • VP9 and AV1 are not copied into MP4 or MOV, because many phones and players cannot play them there.
  • Only the main video and sound tracks are kept. Subtitles, chapters and other sound tracks are left out.
  • Re-encoding needs WebCodecs (Chrome, Edge and Safari 16.4 or newer; Firefox 130 or newer). If the browser cannot read the sound or make the needed sound, the video is saved without sound and the page says so first.
  • Some browsers cannot play every format; Safari, for example, cannot show an MKV preview. The file itself is fine.

Frequently asked questions

Does converting lose quality?

Not when the picture and the sound are copied: the page says "copied as it is" and the result has exactly the same frames. When they are encoded again, the quality drops very slightly; the bitrate is kept close to the original.

Why does MP4 to WebM take so long?

WebM cannot hold the H.264 picture of most MP4 files, so every frame is encoded again as VP9. That takes much longer than copying.

Why is my VP9 video encoded again for MP4?

MP4 can technically hold VP9, but many phones and players do not play it there, so the converter makes H.264 instead.

What happens to subtitles?

Only the main picture and sound tracks are converted; subtitles and extra sound tracks are left out.

Is my video uploaded?

No. The conversion runs in your browser and the video never leaves your device.

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