# Convert 3GP to MP4

> Convert 3GP to MP4 online free: old phone and WhatsApp videos become MP4 that plays on any phone, TV or editor. Many at once, nothing is uploaded. No sign-up.

URL: https://nibbo.org/en/3gp-to-mp4/

## 3GP

3GP is the format of older mobile phones and MMS messages; WhatsApp and some Android apps still save short clips as 3GP.

Newer 3GP files hold H.264 and AAC, which go into an MP4 as they are. Older ones use H.263 with AMR sound, which is re-encoded to H.264 and AAC.

## 3GP to MP4: remux or re-encode

Some 3GP files are remuxed into MP4 in seconds, without quality loss; older ones with codecs MP4 can’t hold are re-encoded. The list shows which way each file goes before you start.

A remuxed file is about the same size as the 3GP. 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 3GP 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

### 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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