MKV to FLAC converter
Extract FLAC audio from MKV video in seconds, free. No upload, no sign-up, no size limit: it runs in your browser.
Last updated
Quick answer: To extract FLAC audio from MKV video, add the MKV file to the iHateFiles MKV to FLAC converter and press Convert. The conversion runs in your browser, so the file is never uploaded, and it is free with no sign-up, watermark or size limit. Lifts the soundtrack out of the video and saves it as FLAC. The picture is discarded; nothing is re-recorded.
Should you convert MKV to FLAC?
Worth doing when you want the soundtrack of a MKV on its own: a podcast, an interview, a piece of music from a video. Choose a higher bitrate than you think you need, because the FLAC is encoded from the video's audio rather than from a master.
Taking the sound out of MKV
A MKV file holds a picture track and a sound track side by side. This keeps the sound and discards the picture, so what you get is the FLAC on its own at whatever bitrate you choose. Nothing about the MKV original is altered.
MKV and FLAC side by side
| MKV | FLAC | |
|---|---|---|
| Compression | Lossless | Lossless |
| Transparency | No | No |
| Animation | No | No |
| Written here | Yes | Yes |
What usually goes wrong
About the MKV. MKV and WEBM share a signature because WEBM is a restricted Matroska, so tools sometimes report one as the other. What matters is the codecs inside.
About the FLAC. Converting an MP3 to FLAC produces a large file that sounds exactly like the MP3. Lossless compression preserves what it is given, including the damage.
How to convert MKV to FLAC
- Add your MKV file. It is read from your disk and stays there.
- Check the settings. The output format is already set to FLAC.
- Press convert and the FLAC file is saved back to your device.
Questions
How do I convert MKV to FLAC?
Open this page, add your MKV file, and press convert. The file is decoded and re-encoded by your own browser and saved back to your device. Nothing is uploaded.
Is this MKV to FLAC converter free?
Yes, completely. There is no account, no sign-in, no watermark and no daily limit, because there is no server doing the work. Your own device does it.
Are my files uploaded anywhere?
No. There is no upload endpoint. The conversion runs inside this browser tab, so your file never leaves your device. You can open your browser's network panel and watch: nothing carrying your file is sent.
Is there a file size limit?
No fixed limit. Because the work happens on your machine there is no server quota. The only ceiling is your own device's memory, which for video means very large files may be slow.
Does extracting audio reduce the quality?
The soundtrack is re-encoded to FLAC, so there is one generation of loss at the bitrate you choose. Pick a higher bitrate, or a lossless target like WAV or FLAC, to avoid it.
Can I convert several MKV files at once?
Yes. Add as many as you like and they are converted one after another, then offered as a single ZIP.