How to convert Matroska (MKV) to AAC
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Upload your file
Drag and drop a file or click to select one. Keep this page open while the file uploads and converts.
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Convert Matroska (MKV) to AAC
NexMedia converts Matroska (MKV) to AAC on its own servers. Processing time depends on the file size and how busy the queue is.
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Download the converted file
When the conversion finishes, the download appears on this page. Your converted file is kept for 2 hours, then deleted.
About Matroska (MKV)
Matroska (MKV) is an open container format that can hold almost any video and audio codec, any number of audio and subtitle tracks, chapters and attachments.
It is popular for films and series with several audio languages and subtitle tracks, and for archiving video.
Many phones, browsers and TVs do not play MKV files directly, even when they support the codecs inside.
Convert MKV to AAC online free, no account required — AAC is the lossy audio codec that succeeded MP3.
Change MKV to AAC without losing quality — convert MKV to AAC free in your browser.
Why won't my MKV file play on my TV or phone? Most TVs and phones play MP4 or H.264 but not the Matroska container, so converting to MP4 makes the file playable on almost any device.
About AAC
AAC (Advanced Audio Coding) is the lossy audio codec standardised in MPEG-2 and MPEG-4 as the successor to MP3; at the same bitrate it generally sounds better than MP3.
It is the audio in most MP4 videos, in Apple Music and on YouTube; a .aac file is a bare AAC stream without a container.
A bare .aac stream has only limited room for tags and cover art, so music players usually expect AAC inside an M4A file.
Why convert music to AAC instead of MP3? At the same bitrate AAC sounds better, and every modern phone, computer and streaming service decodes it.
What changes when you convert MKV to AAC
- The soundtrack of the MKV is re-encoded as AAC at the default settings, so it is close to the original but not bit-identical.
- Only the sound is kept: the AAC file contains the audio track of your MKV, and the picture is dropped.
Settings you can change
Before you convert MKV to AAC, you can adjust: Audio codec, Rate control, Audio bitrate, Quality (VBR), Sample rate, Channels, Normalize loudness, Trim start, Trim duration, and Keep tags.
Limits
Each plan sets a maximum file size and a number of conversions per day, and video and audio files also have a maximum length. Guests can convert files up to 100 megabytes and 5 per day; a free account raises this to 500 megabytes and 25 per day; paid plans go up to 100 gigabytes.
Your converted AAC file is kept for 2 hours, then deleted.
MKV to AAC: questions and answers
Does converting MKV to AAC reduce quality?
The soundtrack of the MKV is re-encoded as AAC at the default settings, so it is close to the original but not bit-identical.
What is the difference between MKV and AAC?
MKV is a flexible open container for video with any number of audio and subtitle tracks. AAC is the lossy audio codec that succeeded MP3.
Can I change the settings when converting MKV to AAC?
Before you convert MKV to AAC, you can adjust: Audio codec, Rate control, Audio bitrate, Quality (VBR), Sample rate, Channels, Normalize loudness, Trim start, Trim duration, and Keep tags.
Do I need an account to convert MKV to AAC?
No. You can convert MKV to AAC without an account; signing in raises the file-size and daily limits.
How long is my converted AAC file kept?
The AAC file you convert from MKV is kept for 2 hours, then deleted automatically.
When I convert MKV to AAC, can I keep just the sound?
Only the sound is kept: the AAC file contains the audio track of your MKV, and the picture is dropped.
Will converting MKV to AAC change my original file?
No. The conversion reads your MKV and writes a new AAC file, leaving your original MKV file untouched.