Free online M2TS to AAC converter

Source format

M2TS is a video container format used mainly for Blu-ray discs, AVCHD camcorders, and some digital video recorders. It typically stores high-definition video along with one or more audio tracks, subtitles, and metadata. Because it is a container, an M2TS file may hold different codecs, but it is commonly associated with MPEG-2 Transport Stream based media used for playback and archiving.

Target format

AAC is a widely used audio-only compression format known for good sound quality at relatively small file sizes. It is supported by most phones, media players, streaming platforms, and editing tools. AAC is commonly used for music, podcasts, video audio tracks, and mobile playback. Converting M2TS to AAC extracts the audio from the video container and saves it as a standalone audio file.

How to perform the conversion

The best tool for this conversion is usually FFmpeg, because it can extract audio directly and preserve quality when the source audio is already AAC, or re-encode when needed.

1. Install FFmpeg on your computer.
2. Open a terminal or command prompt in the folder containing the M2TS file.
3. Run a command such as ffmpeg -i input.m2ts -vn -c:a aac output.aac.
4. If you want to copy the existing AAC audio without re-encoding, use ffmpeg -i input.m2ts -vn -c:a copy output.aac only when the source audio stream is already AAC-compatible.
5. Check the resulting output.aac file in an audio player to confirm it plays correctly.

If you prefer a graphical workflow, you can also use desktop editors such as VLC, Audacity with FFmpeg support, or HandBrake for audio extraction in some workflows. On 101convert.com, you can convert the file online for free without installing any software.

Notes on quality and compatibility

M2TS often contains multiple audio tracks, so make sure you select the correct one before converting. If the source audio is already AAC, stream copy avoids quality loss; if not, re-encoding to AAC introduces a small quality reduction, though usually minimal at a reasonable bitrate. Some players expect AAC in an M4A or MP4 container rather than a raw .aac file, so compatibility may be better if you need broader device support. Also, because M2TS is a video container, converting to AAC removes the video entirely and keeps only the audio track.