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Convert video to MP4

Drop one or many MOV, MKV, WebM or M4V files and get MP4s that play everywhere. When the picture is already H.264 (most cameras, screen recorders and phones in Most Compatible mode) it is copied into the MP4, not re-encoded: done in seconds, nothing lost. Other video is converted to H.264 on your device. Nothing is uploaded.

    MP4 that plays on phones, Windows, Macs and every editor. When the picture is already H.264, it is copied, not re-encoded: no quality lost, done in seconds.

    How to use it

    1. Drop the filesOne or many: MOV, MKV, WebM or M4V.
    2. Watch each rowIt says whether the picture was copied or converted, the size and the time.
    3. SaveA single file downloads by itself; with several, press Save on each.

    What you can download here

    • MP4 with the H.264 picture copiedsame picture, new wrapper, seconds
    • MP4 converted to H.264HEVC, VP9 or AV1 re-encoded, AAC sound

    Example: OBS recordings for an editor

    Start with
    Three MKV files from OBS (H.264 video, AAC sound).
    Do this
    Drop all three at once.
    You get
    Three MP4s, each listed as "H.264 picture copied, no quality lost", ready for Premiere or CapCut.

    An MKV with several audio tracks keeps only the first one in the MP4.

    Good to know

    Screen recorders such as OBS are often set to MKV so a crash can't ruin the recording. The video inside is usually H.264, so converting it here is a copy, like OBS's own Remux, without opening OBS.

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    A transcript side panel on every YouTube and TikTok video, a library of everything you transcribe, and one click to open any of it in these tools.

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    Pro · early access

    Pro keeps this free

    Every tool stays free. Pro (early access, $9/month) adds batch delivery for client work and the extension's Pro features; longer files and multi-file projects are in development. Early subscribers keep their price and choose what gets built next.

    What Pro includes

    Next steps

    Compress videoFit a video under 10 MB, 25 MB or any size, no upload.Trim video NewCut the start, the end or a middle part, to the frame.Transcribe a fileMP4, MOV, MP3, WAV, M4A to text and captions, without uploading.Filler word removerUm, uh, false starts and repeats cut; keeps your last take.Silence removerCut dead air; get the tightened video, an EDL or a WAV.Auto-reframe to vertical16:9 → 9:16 with a crop that follows the face.

    All 56 free tools →

    Questions

    Why won't my MOV or MKV open?

    Some phones, players and editors only accept MP4. MOV and MKV are wrappers: the video inside is often already H.264, so it only needs a new wrapper, which is what this does.

    Does converting lose quality?

    Not when the picture is H.264: it is copied bit for bit. HEVC, VP9 or AV1 video is re-encoded to H.264 at a high bitrate. Each file says which happened.

    Can it convert iPhone HEVC videos?

    When your browser can play HEVC (Chrome and Edge on most recent computers can), yes: they come out as H.264 for editors and PCs that can't open HEVC. If the browser can't decode the file, it is listed with the reason.

    Can I convert several files at once?

    Yes. Drop them together: they are converted one after another, and you press Save on each.