MTS to M2TS Converter

MTS to M2TS Converter

.MTS and .m2ts are the same format — both are the BDAV MPEG-2 transport stream that AVCHD camcorders and Blu-ray discs use, with the same 192-byte packets and the same H.264 video inside. The only real difference is the filename: AVCHD camcorders save .MTS, while computers and Blu-ray tooling write .m2ts.

Because the payload is identical, renaming clip.mts to clip.m2ts is usually all you need — software that "requires .m2ts" will almost always accept the renamed file with no re-encoding. Use this converter when you want more than a rename: normalizing a folder of mixed clips to one extension and consistent settings, trimming, or adjusting bitrate. A straight conversion re-encodes H.264 to H.264, which costs a little quality for no change in format, so reach for it only when you actually need those edits.

Why Two Extensions Exist for One Format

AVCHD was developed jointly by Sony and Panasonic and introduced in 2006 for consumer HD camcorders. The recordings are stored in the BDAV (Blu-ray Disc Audio/Video) MPEG-2 transport stream container. AVCHD equipment uses the legacy 8.3 filename convention (eight characters, three-letter extension), so a camcorder can only write .MTS — three letters. The same container used for Blu-ray movies and on computers carries the longer .m2ts extension. Identical bytes, two names dictated by where the file was written.

One genuine difference worth knowing: commercially pressed Blu-ray .m2ts files are usually protected with AACS (Advanced Access Content System) encryption, whereas camcorder .MTS files are not. Encrypted Blu-ray streams cannot be re-encoded by an online tool.

MTS / AVCHD Format at a Glance

M2TS Format at a Glance

How to Convert MTS to M2TS

1. Upload Your MTS File: Drag and drop your .mts clips onto the page, or click "Add Files" to browse. You can queue several and convert them together.
2. Set the Video Codec: Leave Video Codec on H.264 to keep the AVCHD payload, or pick H.265/MPEG-2 only if your target player needs it. Audio Codec defaults to AAC; choose AC3 to stay closest to the original AVCHD audio.
3. Trim or Re-bitrate (Optional): Use Trim → Time Range to cut a section, or File Compression (Specific file size or Variable Bitrate) to shrink the output. Leave Quality Preset on "Very High" otherwise.
4. Convert and Download: Click Convert and download your .m2ts file. No sign-up, no watermark.

Frequently Asked Questions

Can I just rename .mts to .m2ts instead of converting?

In most cases, yes. The two extensions wrap the identical BDAV transport stream, so renaming video.mts to video.m2ts produces a file that players and editors treat as M2TS. Convert only when you also need to trim, change bitrate, or re-encode — a rename alone never touches quality, while a conversion re-encodes H.264.

Will converting MTS to M2TS lose any quality?

Slightly, if you do a true conversion. Since both formats store H.264, the tool decodes and re-encodes the video, which is a generation of lossy compression for no gain in format. To avoid that entirely, rename the file. If you do convert, keep the Quality Preset on "Very High" to minimize the loss.

My editor or player still rejects the .m2ts file — why?

The container is fine; the usual culprit is the H.264/AC-3 combination itself, which some apps and devices do not decode. If a rename and a re-encode both fail to play, the cleaner fix is a different container and codec set entirely — convert the clip with MTS to MP4, which produces a widely compatible H.264 MP4 that nearly every player and editor accepts.

Does this preserve the AVCHD audio and 5.1 surround?

If your source carries Dolby AC-3 5.1, choose AC3 under Audio Codec to pass the surround layout through. The default AAC re-encodes the audio to stereo or multichannel AAC, which most computer players prefer but is not the original AVCHD audio stream. In our testing, leaving the codec on H.264 + AC3 produced an .m2ts that VLC and Windows-based players opened without extra codecs.

Can I convert an .m2ts ripped from a Blu-ray disc?

Only if it is unencrypted. Commercial Blu-ray titles are protected with AACS, and an encrypted .m2ts cannot be read or re-encoded by an online converter. Unprotected .m2ts files — for example, AVCHD recordings already on your computer — convert normally.

How are my uploaded files handled?

Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically a few hours after conversion. There is no sign-up, no watermark, and your files are never shared or made public. The practical limit on a large AVCHD clip is upload size and time, not your device.

What if I need the reverse, .m2ts back to .mts?

Use M2TS to MTS for the other direction — handy when a Sony AVCHD tool or camcorder workflow expects the 8.3-style .MTS name. If you instead want the explicit AVCHD camcorder structure, MTS to AVCHD targets that family directly.