MKV to FLAC Converter
Extract audio from MKV video files and convert to lossless FLAC format for archival and audiophile use. Preserve perfect audio quality with efficient compression. Professional-quality audio conversion powered by FFmpeg, all processing happens securely in your browser.
Recommended Settings
For Archiving
- •Level 8 for maximum compression
- •100% lossless quality
- •Perfect audio preservation
For Production
- •Level 5 for balanced performance
- •Faster encoding/decoding
- •Still fully lossless
Pro Tips
- •All compression levels are lossless - no quality difference
- •FLAC offers better compression than WAV
- •Level 8 creates smallest files
Most Popular
Most users choose level 5 for balanced compression and speed, or level 8 for archival
When to Use This Tool
Extract and preserve audio from MKV videos in lossless FLAC format for archival purposes.
Recommended: Level 8
Extract high-fidelity audio tracks from concert videos or music performances without quality loss.
Recommended: Level 8
Extract lossless audio from video sources for further editing and production work.
Recommended: Level 5
How It Works
Upload your MKV video file
Select compression level (0-8)
FFmpeg extracts and encodes lossless audio
Download your FLAC audio file
100% Private
Files never leave your device. All processing happens locally in your browser.
Lightning Fast
Powered by FFmpeg.wasm (WebAssembly) for optimal performance on modern browsers.
Open Source
Built with verified, open-source libraries. Fully transparent.
Frequently Asked Questions
What is MKV format?
MKV (Matroska Video) is a multimedia container format that holds video, audio, and subtitles. This tool extracts the audio track from MKV video files and saves it as lossless FLAC.
What compression level should I use?
Level 5 (default) offers balanced compression and speed. Level 8 provides maximum compression (smallest files) but takes longer. Level 0 is fastest. All levels are lossless - they only affect file size and encoding time, not quality.
Will the audio quality be lossless?
Yes, FLAC is a lossless format. The audio will be extracted without any quality loss, preserving the original audio exactly as it appears in the MKV file.
How much smaller will FLAC be compared to WAV?
FLAC typically compresses to 50-60% of the original uncompressed size. So a 100 MB WAV file would become around 50-60 MB as FLAC with identical quality.
What devices support FLAC?
FLAC is widely supported on computers, Android devices, and many portable audio players. iOS/iPhone requires third-party apps for FLAC playback.