How to use the MTS to MP4 converter
- Choose your MTS video or drop it on the box.
- Check the settings. "Same as original" resolution is fastest and lets fast mode copy compatible videos without re-encoding. Lower it to 720p for a smaller file.
- Click "Convert to MP4". A progress meter shows how far along it is.
- Download your MP4.
Why convert MTS to MP4?
MTS clips from AVCHD camcorders do not play on phones and often lose their AC3 sound in common players. MP4 with AAC sound works everywhere.
- MTS: aC3 sound is not supported by many phones and players.
- MP4: plays almost everywhere.
- MP4: good quality at small sizes with H.264.
The H.264 video is copied without loss where possible, and the AC3 sound is converted to AAC so it plays on every device.
MTS vs MP4
| MTS | MP4 | |
|---|---|---|
| Full name | AVCHD Video (BDAV MPEG-2 Transport Stream) | MPEG-4 Part 14 |
| Type | Video | Video |
| Created by | Sony and Panasonic (2006) | Moving Picture Experts Group (MPEG) (2001) |
| Compression | Lossy | Lossy |
| Typical codecs | H.264 + Dolby Digital (AC3) | H.264 + AAC |
| Best for | HD camcorder footage | Sharing videos online, phone recordings, social media uploads and streaming |
| Plays on | VLC and some editors; phones, many TVs and web uploads do not accept MTS | Windows, macOS, iPhone, Android, smart TVs, game consoles and every modern browser |
Does converting MTS to MP4 lose quality?
Often none. When the MTS contains H.264 video, MP4 can hold it as it is, so fast mode copies the streams without re-encoding. Other codecs (including HEVC while "Play everywhere" is ticked) are re-encoded at "Balanced" quality, which looks the same as the original to most people.
How long does it take?
Seconds when fast mode applies, even for a full film. If the video must be re-encoded, expect a few minutes for a long HD video.
What is an MTS file?
MTS is the file format used by AVCHD camcorders from Sony, Panasonic and Canon. It holds H.264 video and AC3 sound in a Blu-ray-style transport stream.
What is an MP4 file?
MP4 is a container that usually holds H.264 or H.265 video with AAC sound. It is built on Apple's QuickTime file structure and became an ISO standard in 2001. Because almost every phone, browser, TV and editing app can play it, MP4 is the safest choice when you need a video to just work.
Frequently asked questions
Is the MTS to MP4 converter free?
Yes, completely free, with no sign-up and no watermark. Files up to 1 GB each can be converted, and there is no daily limit.
Is my file uploaded to a server?
No. The converter runs inside your browser using WebAssembly, so your file is processed on your own device and never sent to us or anyone else.
Will the MP4 sound and look as good as the MTS?
Often none. When the MTS contains H.264 video, MP4 can hold it as it is, so fast mode copies the streams without re-encoding.
Can I convert MP4 back to MTS?
Yes, use the MTS Converter and choose MTS as the output.
An MTS clip plays with no sound. What should I do?
The audio is AC3. Converting to MP4 turns it into AAC.
Does it work on iPhone and Android?
Yes, in Safari, Chrome and other modern mobile browsers. Short files work best on phones; for long or high-resolution videos a computer is faster.