# Convert MTS to MP4

> Convert MTS to MP4 online free: AVCHD camcorder clips become MP4 in seconds, the picture copied with no quality loss. Batch, no upload. No sign-up.

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

## MTS

MTS (and M2TS) is the AVCHD format of Sony, Panasonic and Canon camcorders, stored on the card under PRIVATE/AVCHD/BDMV/STREAM.

The picture is H.264, which an MP4 holds as it is; the sound is usually Dolby Digital (AC-3) or PCM, which is re-encoded to AAC so phones and editors play it.

## MTS to MP4: remux or re-encode

Converting MTS 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 MTS. 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 MTS 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

### Which file do I take from the camcorder card?

The MTS files under PRIVATE/AVCHD/BDMV/STREAM. A long recording can be split into several MTS files; convert them all and join them with Merge Videos.

### 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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