MOV to MP4, or just the sound?

Turn an iPhone MOV or a WebM into an MP4 that every platform and editor takes, or keep only the sound — made by your browser, never uploaded.

Runs in your browser. Nothing is uploaded, no signup.

Video converterMade on this device

Watch an example

13 seconds · a made-up example

Videos made in the studio come out ready to upload: vertical H.264 + AAC MP4.Join the beta

How it works

Short and checkable: every limit links to the platform's own page, read on 28 Oct 2026.

  1. Pick the format

    MP4 with H.264 and AAC is the one every platform takes; WebM is for the web; M4A and WAV keep the sound alone.

  2. Decoded and encoded here

    Mediabunny reads the file, WebCodecs decodes and encodes it on your computer, and the new file is written in this tab.

  3. Check it before you post

    Play the new file in the player: if the source used a codec your browser can't decode, the tool says so instead of making a broken file.

What it doesn't do

  • It doesn't make MP3 (browsers have no MP3 encoder); M4A is smaller at the same quality.
  • Subtitle tracks and chapters inside the file are not carried over.
  • Whether HEVC decodes depends on your system: Safari and Edge usually can, Chrome on some Windows computers can't.

Questions

How do I convert a MOV to MP4?

Drop the MOV and keep “MP4 · H.264”. iPhone videos are often HEVC in a MOV; the MP4 comes out as H.264 and AAC, which every platform and editor takes.

How do I extract the audio from a video?

Choose “M4A · sound only” for a small AAC file, or “WAV” for uncompressed sound to edit.

Why does my browser say it can't read the file?

Each browser decodes the codecs its system has. HEVC may not decode in Chrome on some Windows computers; Safari and Edge usually can.

Sources

  1. 1TikTok for Developers — Content Posting API — media transfer guideupdated 4 Aug 2026 · read 28 Oct 2026
  2. 2Meta for Developers — Instagram API — IG User Media, Reel specifications and captionAPI v26.0 · read 28 Oct 2026
  3. 3Mediabunny — Mediabunny 1.61.4 — reads and writes video files in the browserMPL-2.0; downloaded by your browser · read 28 Oct 2026
  4. 4MDN Web Docs — WebCodecs API — the browser's own video encoder and decoderChrome, Edge, Safari 17+; Firefox 130+ · read 28 Oct 2026

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