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Video Converter

Change a video's format: MP4 for phones and TVs, WebM for the web, MOV for Apple editing apps, MKV for media players. Several files at once, converted on your device.

Converts between MP4, MOV, WebM and MKV, up to 20 videos at a time. Runs on your device: the video is never uploaded. Works in Chrome, Edge, Opera and Samsung Internet (Android and computers), Safari 16.4 or later (iPhone, iPad and Mac; sound needs Safari 26), and Firefox 130 or later on computers. Firefox for Android can't encode video yet.

How to convert a video

  1. Choose one or more videos. Each one shows its format, picture and sound codecs, and what will happen to it.
  2. Pick the format to convert to and the mode: Plays everywhere or Fastest. Lower the resolution or remove the sound if you like.
  3. Press Convert and download each new file.

Plays everywhere or Fastest?

A video file is a container (MP4, MOV, WebM, MKV) holding a picture track and a sound track, each in a codec such as H.264, H.265, VP9 or AAC. Plays everywhere keeps a track unchanged only when it is in the codec that plays almost everywhere in the new format (H.264 and AAC in MP4, VP9 and Opus in WebM) and re-encodes anything else. Fastest keeps every track the new format can hold, so most files are rewrapped in seconds with no quality change, but an H.265 picture in an MP4, for example, won't play on some older phones and PCs.

Example

An iPhone video in the High Efficiency format is a MOV with an H.265 picture at about 8 Mbit/s and AAC sound. Converted to MP4 with Plays everywhere, the sound is copied and the picture is re-encoded to H.264. H.264 needs about 1.4 times the bits for the same look, 11.2 Mbit/s, capped for 1080p at 30 fps at 1920 × 1080 × 30 × 0.1 × 1.5 = 9.3 Mbit/s. With Fastest, the same video is simply rewrapped into an MP4 in a few seconds.

Related tools

Video files are read and written with Mediabunny 1.61.3 (Mozilla Public License 2.0), loaded unmodified as a separate file, and coded by your browser's own video and audio encoders (WebCodecs). Licence and source code.

Frequently asked questions

Which format should I choose?

MP4 (H.264 video, AAC sound) plays on every phone, TV, browser and social site, so it's the safe choice. WebM is the web's open format and is often smaller. MOV is Apple's format, for iMovie and Final Cut. MKV holds almost anything and suits media players like VLC and Plex.

Why are some files done in seconds?

When the picture and sound are already in codecs the new format plays well, they are copied into the new file without re-encoding: no quality change, and only as slow as reading the file. Otherwise every frame is decoded and encoded again, which takes longer: how long depends on the video's length and resolution and on your device.

Can it convert AVI, WMV or FLV?

No. Those older formats use codecs browsers can't read, so a browser tool can't open them. VLC, a free desktop app, can convert them to MP4; this tool reads MP4, MOV, M4V, WebM, MKV, 3GP and TS.

Will converting lower the quality?

A rewrap doesn't change the quality at all. A re-encode keeps about the same bits per pixel as the original (more when converting from the efficient H.265, VP9 or AV1 to H.264), so the difference is small, but some detail is always lost when a video is encoded again.

Is my video uploaded?

No. The conversion runs on your device with your browser's own encoders, so files stay private and there's no upload or queue, whatever their size (up to 2 GB each).

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