MKV to FLAC Converter
Convert MKV to FLAC online for free. MKV to FLAC in seconds — no software install, no watermark, secure and fast.
Drag & drop your MKV file here, or
How to convert MKV to FLAC in 3 steps
- 1
Upload your MKV file
Drag and drop or select the MKV file you want to convert.
- 2
Choose FLAC as output
The output format is pre-selected for you — just confirm and start the conversion.
- 3
Download your file
Once processing finishes, download your converted FLAC file instantly.
Benefits of converting MKV to FLAC
Get lossless compression that preserves full audio fidelity at roughly half the size of WAV
Switching from MKV to FLAC means your file now offers lossless compression that preserves full audio fidelity at roughly half the size of WAV.
Wider compatibility
MKV is great for support for multiple audio/subtitle tracks and near-lossless quality, but not every app or device handles it well. Converting to FLAC sidesteps that, so the file opens wherever you need it to.
No quality compromise
ConvertFastHub runs FFmpeg at production settings, preserving as much of the original MKV fidelity as the FLAC format allows.
Keep your original too
Converting doesn't touch your source file — you get a brand-new FLAC file back and can keep both versions.
Frequently asked questions
- How do I convert MKV to FLAC online?
- Upload your MKV file above, select FLAC as the output format, and click Convert. ConvertFastHub processes the file in the cloud and gives you a download link — no software installation required.
- Is it free to convert MKV to FLAC?
- Yes. Free accounts get 10 conversions every 24 hours with files up to 50MB. For unlimited conversions, larger files up to 1.5GB, and priority processing, upgrade to ConvertFastHub Pro.
- What's the advantage of FLAC over MKV?
- FLAC offers lossless compression that preserves full audio fidelity at roughly half the size of WAV. Meanwhile, MKV is known for support for multiple audio/subtitle tracks and near-lossless quality, ideal for archiving — the right choice depends on where you plan to use the file.
- Will converting MKV to FLAC reduce quality?
- ConvertFastHub uses production-grade engines (FFmpeg, LibreOffice, ImageMagick) configured for maximum fidelity. Some format conversions are inherently lossy by design; where possible, we preserve the original quality.
- Is my file safe when I convert it?
- Files are uploaded over an encrypted connection directly to storage, processed in an isolated sandboxed worker, and permanently deleted within 24 hours.