# Convert M4V to MP4

> Convert M4V to MP4 online free: iTunes and iMovie videos become MP4 in seconds, the picture copied with no quality loss. Batch, no upload. No sign-up.

URL: https://nibbo.org/en/m4v-to-mp4/

## M4V

M4V is Apple’s variant of MP4: iTunes, iMovie, Handbrake presets and the TV app export it, usually with H.264 video and AAC sound.

Most M4V files are MP4 in all but name, so they are remuxed in seconds. Films bought in iTunes are encrypted (FairPlay DRM) and can’t be converted by any tool.

## M4V to MP4: remux or re-encode

Converting M4V to MP4 is usually a remux: the H.264 or HEVC picture is copied as it is, so the result looks exactly like the original. Sound that MP4 players don’t take (AC-3, PCM) is re-encoded on its own, which takes seconds.

A remuxed file is about the same size as the M4V. A re-encode, or the High, Balanced and Small presets, makes it smaller: a 1080p minute is around 45 MB at High and 30 MB at Balanced.

## How it works

1. Drop one or more M4V files: MP4 is already selected. Quality, maximum resolution and sound can be changed before you start.
2. Streams that fit MP4 are copied; anything else is re-encoded with WebCodecs, or FFmpeg compiled to WebAssembly when the browser can’t.
3. Download each file, or all of them as one ZIP.

## Questions

### Can I convert movies bought in iTunes?

No. Purchased iTunes films are encrypted with FairPlay DRM, which no converter may open. Home videos and iMovie or Handbrake exports work.

### Are my videos uploaded?

No. Reading, remuxing and encoding all run in this browser tab. Open DevTools and watch the Network tab while a file converts: no request carries it.

### Why is one file done in seconds and another takes minutes?

A remux only copies the streams, so it runs at disk speed. A re-encode decodes and encodes every frame; FFmpeg in WebAssembly, used when the browser can’t, is slower still.

### How large can a video be?

Up to 3 GB per file for free, and as many files as you like. Remuxes and WebCodecs re-encodes stream from the disk; the FFmpeg path holds the result in memory.

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