M2TS to M4A Converter

Extract Audio from M2TS to M4A Online

An M2TS file is the BDAV MPEG-2 transport stream that Blu-ray Discs and AVCHD camcorders wrap their high-definition video and audio in. This tool pulls the audio track out of that stream and saves it as an M4A (AAC) file you can play on an iPhone, in iTunes/Apple Music, or anywhere AAC is supported. The video is discarded — the result is audio only — which is exactly what you want when you only need the soundtrack of a concert capture, an interview, or a movie's score off a clip you can already open.

How to Convert M2TS to M4A

1. Upload Your M2TS File: Drag and drop your .m2ts or .mts clip onto the page or click "+ Add Files". Add several clips to extract their audio in one batch with the same settings.
2. Set the Quality Preset: Open Advanced Options and pick a Quality Preset, or switch to Custom Bitrate (Constant or Variable). For voice and interviews 96-128 kbps is plenty; for music or a film score aim for 192-256 kbps to keep the AAC encode transparent.
3. Adjust Audio Channel, Audio Sample Rate, or Trim (Optional): Leave Audio Channel and Audio Sample Rate on "Original" to match the source, downmix a 5.1 surround track to stereo for phone playback, or use Trim to keep only the part of the recording you need.
4. Convert and Download: Click "Convert" and download your M4A. No sign-up, no watermark.

What You Get Back Depends on the Source Audio

M2TS doesn't define a single audio codec, so the fidelity of your M4A depends on what was inside the stream. AAC is a lossy codec, so re-encoding an already-lossy track is a second lossy generation, while re-encoding an uncompressed track is a clean single-generation encode.

Frequently Asked Questions

Does converting M2TS to M4A keep the video?

No. M4A is an audio-only container, so the H.264 video in your M2TS file is dropped and only the soundtrack is saved. If you want to keep the picture and just modernize the container, use the M2TS to MP4 converter instead, which re-wraps the whole clip into a widely supported file.

Will I lose quality extracting AAC audio from an M2TS file?

It depends on the source codec. If the audio was already lossy — Dolby Digital (AC-3), DTS, or Dolby Digital Plus — the M4A is a second lossy generation, so match or exceed the source bitrate to keep it transparent. If the source was uncompressed Linear PCM, going to AAC is a single clean encode. In our testing, a stereo 48 kHz AVCHD clip extracted at a 256 kbps AAC preset was indistinguishable from the source in normal listening; the generational loss only becomes a concern if you re-edit and re-export many times. For a lossless copy, extract to FLAC instead.

What audio codecs can an M2TS file contain?

It depends on where the M2TS came from. A Blu-ray Disc M2TS can carry Dolby Digital (AC-3), DTS, or uncompressed Linear PCM as its mandatory formats, plus optional Dolby Digital Plus, DTS-HD High Resolution, Dolby TrueHD, or DTS-HD Master Audio. An AVCHD camcorder M2TS is more restricted — it uses Dolby Digital (AC-3) or LPCM only. This converter reads whichever audio stream is present and encodes it to AAC; support for the exotic lossless Blu-ray formats (TrueHD, DTS-HD Master Audio) can vary, so check the result if your source uses one.

Can I convert the M2TS files from a commercial Blu-ray movie?

Only if they are not copy-protected. Commercial pre-recorded Blu-ray discs are almost always encrypted with AACS (and sometimes BD+), and those M2TS streams cannot be read or converted while the protection is in place — conversion tools cannot legally bypass it. This converter works on M2TS files you can already open, such as your own AVCHD camcorder footage or unprotected recordings. It cannot decrypt a protected Blu-ray.

Is .m2ts the same as .mts, and why M4A over MP3?

Yes — .m2ts and .mts are the same BDAV stream; the camcorder spelling just follows an older 8.3 filename convention, so both extract identically here (see the MTS to M4A converter for the camcorder-named version of this exact tool). Choose M4A (AAC) over MP3 when you want slightly better quality at the same bitrate and native playback on Apple devices and iTunes; pick the smaller, universally compatible M2TS to MP3 if you need playback on very old hardware.

How are my files handled, and is there a size limit?

Your M2TS file is uploaded over an encrypted connection, processed on our servers, and the result is sent back for download. Uploaded files and outputs are deleted automatically a few hours after conversion — no sign-up, no watermark, never shared or made public. The main practical limit is upload size and time: M2TS clips carry full HD video, so a long recording can take a while to upload even though the M4A you get back is small.