UseTool

Convert a video to another format

Changes the container without touching the picture where possible. MP4, WebM, MKV and MOV, all on your device.

Drop a video hereMP4 · MOV · WebM · MKV · TS

🔒 Your video never leaves your device.

How it works

How it works

  1. 1

    Add what goes in

    Drop your MP4, M4V, MOV, WebM and 6 more formats here, or pick it from your device.

  2. 2

    Start it

    Set the target container, then start. Everything runs in this browser — no upload, no queue, no account.

  3. 3

    Take the result

    The MP4 · WebM · MKV is ready the moment the run finishes. Save it straight to your device.

What this tool does

Convert video format
Changes the container — MP4, WebM, MKV — and keeps the streams inside where the new one accepts them. Useful when a player refuses a file whose actual video and audio it could handle perfectly well.

When you need this

  • A camera recorded MKV files that the editing program on the laptop will not import.
  • A MOV from an iPhone should play in a browser-based learning platform.

Supported formats

MP4MOVWebMMKVTS

Good to know

Frequently asked questions

What files can I use here?

Reads MP4, M4V, MOV, WebM and 6 more formats. As many files at once as you like.

What do I get back?

You get MP4 · WebM · MKV.

Does the file lose quality?

The existing video and audio packets are copied into the new container whenever it accepts them — no re-encoding, no loss, and much faster. Where the container refuses them, they are rebuilt.

When does it not work?

Which video codecs work depends on your browser. Chrome and Edge read the most, including H.265 on many machines; Safari and Firefox refuse some. A file that will not open here usually opens in Chrome.

Does the video lose quality?

Only when it has to be re-encoded. Cutting, joining and removing the sound track copy the picture data unchanged, so those are lossless. Compressing and adding a watermark do re-encode, which is why they take longer.

How long may a video be?

There is no fixed limit. What decides is the memory of your device: a phone manages a few minutes comfortably, a computer handles far more. If a long video fails, splitting it first and working on the parts usually helps.

Private by design

Your files stay on your device

Your video never leaves your device.

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Ready-made

Workflows for this file type