MKV to AAC Converter
Pull the audio track out of a MKV file and save it as AAC — no upload, done entirely on your device. Drop a MKV file below to get started.
Drop files, or click to browse
MKV files only — processed one at a time
Frequently asked questions
Is this MKV to AAC converter free?+
Yes, with no watermark, no account, and no daily limit.
Is my audio file uploaded anywhere?+
No — conversion runs locally using your browser's own built-in media codecs, entirely inside your browser tab.
Will I lose audio quality?+
Converting between compressed formats can lose a small amount of quality; converting to a lossless format like WAV or FLAC won't.
Is there a maximum file size?+
There's no fixed file-size limit since nothing is uploaded to a server. Processing time scales with the track's length rather than a hard cutoff.
How do I convert MKV to AAC?+
Drop your MKV file into the box above — it's decoded and re-encoded as AAC automatically, with a download ready in seconds.
About MKV and AAC
What is MKV?
MKV (Matroska) is a flexible open container that can hold multiple audio tracks, subtitles, and chapters alongside the video.
Full MKV format guide →What is AAC?
AAC is the compressed audio format behind iTunes, YouTube, and most streaming services — generally more efficient than MP3 at the same bitrate.
Full AAC format guide →The short version: AAC gives you better quality-per-kilobit than MP3, which helps once you run into MKV's biggest limitation: not natively supported by some phones and TVs without an app. It's a natural move when your video is headed toward music and podcasts on Apple devices.
How it works
- 1
Drop your file in
Drag your audio onto the box above, or click it to browse — there's no account to create and no upload to wait on.
- 2
Pick your settings
The output format is already set for this page — just adjust any extra options shown, if there are any.
- 3
Download the result
Your browser processes everything locally and hands you a download link the moment it's done — nothing was ever sent to a server.
Is it private?
Everything happens locally, inside this browser tab. Your audio is read from disk, processed with WebAssembly running on your own device, and handed back to you as a download — it's never transmitted anywhere, so there's nothing to intercept and nothing stored on a server.
Common use cases
- Music and podcasts on Apple devices
- Streaming
- Prepping a podcast episode for a hosting platform
- Fitting a voice memo under a messaging app's size limit
Supported formats
This is one of many pairings the audio toolkit handles. In total it covers:
Related conversions
Format details
About MKV files+
MKV (Matroska) is a flexible open container that can hold multiple audio tracks, subtitles, and chapters alongside the video.
Matroska was designed from the ground up as an open, extensible container, meaning a single MKV file can bundle several audio tracks (say, multiple languages), several subtitle tracks, and chapter markers, all switchable during playback — something older containers like AVI and even MP4 handle less gracefully. That flexibility made it the format of choice for archiving TV shows and films with multiple language options, though a handful of phones and streaming devices still expect MP4 and need MKV converted first.
How to open a MKV file
Opens readily in VLC Media Player. For real editing, use DaVinci Resolve, Adobe Premiere Pro (with an extension).
Good for
- supports multiple audio/subtitle tracks in one file
- open format, no licensing fees
Watch out for
- not natively supported by some phones and TVs without an app
About AAC files+
AAC is the compressed audio format behind iTunes, YouTube, and most streaming services — generally more efficient than MP3 at the same bitrate.
AAC (Advanced Audio Coding) was developed as the designated successor to MP3 under the MPEG standard, using newer compression techniques to squeeze out noticeably better sound quality at the same bitrate, or an equivalent quality at a smaller file size. Apple adopted it as the default format across iTunes and the iPhone early on, and it's since become the standard codec behind most video and streaming platforms as well, since it handles the low bitrates needed for streaming particularly well.
How to open a AAC file
Opens readily in Any modern media player, Any web browser, iTunes/Apple Music. For real editing, use Audacity (free), Adobe Audition.
Good for
- better quality-per-kilobit than MP3
- the default format across Apple's ecosystem
Watch out for
- slightly less universal hardware support than MP3, though still very broad
Need a different format? Try the full Audio Converter, or explore all audio tools.