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MKV to MP4 Converter

Convert MKV videos to MP4 for phones, TVs and editors.

Picture and sound

Picture and sound are copied as they are when the new format allows it (fast, nothing lost). This converts only what older devices can’t play, such as Dolby Digital sound.

MKV, and other videos, several at once

Drop more files anywhere on this page, or

    Runs on your device. No upload wait.

    What you get

    • Picture copied
    • Sound that plays

    Questions

    Why is MKV sound silent on my phone?

    MKV movies often carry Dolby Digital (AC-3) sound, which most phones and browsers can’t decode. With “plays everywhere” on, the sound is converted to AAC while the picture is copied as it is.

    What happens to subtitles and extra audio tracks?

    The main picture and sound track are kept. Subtitle tracks and extra languages are left out, because MP4 handles them poorly; the file list says when that happens.

    Is there a size limit?

    Up to 4 GB per video on a computer (1 GB on a phone). Files are read in pieces and the result is written to your browser’s own storage, so even long videos work; they just take longer.

    Are my videos uploaded anywhere?

    No. Your videos are opened and processed on your device, and the results are saved straight back to it. Nothing is uploaded. How to check.

    Is it free? Do I need an account?

    It is free to use and there is nothing to sign up for. There are no watermarks and no daily limits.

    Missing something, or not working as it should? Tell us