MKV to AAC Converter
Extract and convert the audio track from MKV (Matroska) video files to AAC format. Powered by FFmpeg WebAssembly. AAC is compatible with Apple devices, Android, and all streaming platforms.
Drop your audio file here
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Complete Guide: MKV to AAC Converter
Everything you need to know about using this tool effectively
The MKV to AAC Converter extracts the audio track from Matroska MKV video files and converts it to AAC. AAC is the standard codec for Apple devices, Android, and modern streaming platforms, offering good quality at compact file sizes. All conversion runs in your browser using FFmpeg via WebAssembly.
MKV (Matroska Video) is a widely used video container for movies, TV shows, and downloaded content. The audio inside an MKV can be encoded in various codecs. This tool uses FFmpeg to extract the audio track and the browser's WebCodecs API to encode it as AAC for use on Apple devices, Android, and streaming services.
Play MKV audio on iPhone or iPad
Extract and convert MKV audio to AAC for native playback on iPhone and iPad without any third-party apps.
Upload MKV audio to streaming platforms
YouTube and podcast hosts accept AAC. Extract the audio from MKV videos and upload as AAC to streaming services.
Compact storage of extracted video audio
AAC provides good quality at smaller file sizes than WAV or MP3. Convert MKV audio to AAC for efficient storage on mobile devices.
Prepare MKV audio for Apple software
Convert extracted MKV audio to AAC for import into GarageBand, Final Cut Pro, or other Apple software that works natively with AAC.
Deliver video soundtrack to Apple users
Extract and convert MKV soundtrack audio to AAC to share with collaborators or clients who use Apple devices.
Upload MKV file
Click to browse or drag and drop your MKV file into the upload area.
Wait for FFmpeg to load
On first use, the FFmpeg WebAssembly binary loads from a CDN. This takes a few seconds.
Convert
Click Convert to AAC. FFmpeg extracts the audio track and the browser encodes it as AAC.
Download AAC
Download your AAC file for playback on Apple devices, Android, or upload to streaming platforms.
AAC encoding requires a Chromium-based browser (Chrome, Edge, Brave). Firefox users should choose MP3 or OGG output.
Only the first (default) audio track is extracted from the MKV.
For editing, extract to WAV first before encoding to AAC.
Multichannel audio in the MKV is downmixed to stereo in the AAC output.
Large MKV files take more time to process in the browser.
Does extracting MKV audio to AAC lose quality?
If the MKV audio is already a lossy codec such as AAC or AC3, re-encoding applies a second round of compression. If the MKV audio is lossless, only one round of encoding occurs.
Are my files uploaded to a server?
No. FFmpeg runs in your browser via WebAssembly. Files are processed locally.
Why does the first conversion take longer?
The first conversion loads the FFmpeg WebAssembly binary. This takes a few seconds. Subsequent conversions are immediate.
Why does AAC encoding require Chrome?
AAC encoding uses the WebCodecs API, which is only available in Chromium-based browsers. Use MP3 output if you are on Firefox.
Can I extract multiple audio tracks from the same MKV?
This tool extracts the first (default) audio track only. To select a specific track, use MKVToolNix to demux the desired track first.