How to convert MKV to AAC
To convert MKV to AAC, upload your MKV file, choose AAC as the output format and press Convert. The finished AAC file is ready to save to your phone or computer in seconds, free, with no watermark and no sign-up. Your file is deleted from our server about 30 minutes after the conversion.
This free online converter turns MKV video files into AAC in your browser, with no software to install and no watermark. The conversion runs on our server using ffmpeg, and the result is ready to save to your phone or computer in seconds. Your MKV file is deleted automatically about 30 minutes after the conversion.
What you get with MKV to AAC
- Better quality than MP3 at the same size
- The default audio of YouTube and Apple
- Efficient at low bitrates
- Opens in: iPhone, Android, Windows, macOS, VLC and most hardware players
What to expect from this conversion
- Only the first audio track is extracted. The picture is dropped, so the file is a small fraction of the video's size.
- AAC is lossy, so choose High for the best sound or Small for the smallest file.
- Videos with no sound track cannot be converted to audio.
MKV vs AAC
| Property | MKV | AAC |
|---|---|---|
| Full name | Matroska Video | Advanced Audio Coding (ADTS stream) |
| Released | 2002, Matroska.org (open standard) | 1997, MPEG (Fraunhofer, Dolby, Sony and others) |
| Family | Video | Audio |
| Opens in | VLC, Plex, Kodi, most Android players and modern Windows; limited on iOS and older TVs | iPhone, Android, Windows, macOS, VLC and most hardware players |
| Best for | movie and TV archives with multiple languages; keeping subtitles inside the file | streaming and broadcast; radio and live audio |
Steps to convert MKV to AAC
- Drop your MKV file onto the converter, or click to choose it.
- Check that AAC is selected as the target format and adjust the options if you want.
- Press Convert, then save the new AAC file to your device when it finishes.
Tips for the best result
- Choose MP3 for the widest compatibility.
- Pick FLAC or WAV if you want to edit the sound afterwards.
Frequently asked questions
How do I convert MKV to AAC?
Drop your MKV file on the converter, confirm that AAC is the target format and press Convert. When it finishes, press Save to device or download the AAC file. No account or software is needed.
Is the MKV to AAC converter free?
Yes. It is free, with no watermark, no sign-up and no limit on how many files you convert. The site is supported by ads.
What should I know before converting MKV to AAC?
Only the first audio track is extracted. The picture is dropped, so the file is a small fraction of the video's size. AAC is lossy, so choose High for the best sound or Small for the smallest file.
Can I extract the sound from a MKV video as AAC?
Yes. The first audio track is extracted and saved as AAC. The video picture is not included.
Which programs open AAC files?
AAC files open in iPhone, Android, Windows, macOS, VLC and most hardware players.
How large a file can I convert?
Up to 500 MB per file. Files are deleted from the server about 30 minutes after conversion, and no one looks at them.