Convert MKV to FLAC
Extract the audio from your MKV video files and save it as FLAC, directly in your browser.
How to convert video to audio in 3 steps
Choose a MKV video file.
Click convert to FLAC.
Download your FLAC audio.
Format descriptions
MKV — MKV (Matroska) is a flexible open-source video container that supports multiple video, audio and subtitle tracks in a single file.
FLAC — FLAC is an open-source lossless audio format that compresses without losing quality, roughly halving file size. Ideal for audio archives.
Technical comparison: MKV vs FLAC
Technical breakdown of the MKV and FLAC specifications: compression, colour, transparency and animation support.
| Property | MKV | FLAC |
|---|---|---|
| Specification | MKV (Matroska Multimedia Container) | FLAC (Free Lossless Audio Codec) |
| Media type | Video | Audio |
| Compression | Hybrid (lossy or lossless) · H.264 / HEVC / VP9 / AV1 | Lossless · FLAC |
| Color space / bit depth | 8/10/12-bit HDR | 16/24-bit up to 192 kHz |
| Transparency | Not applicable | Not applicable |
| Animation | Yes (animated) | No (static) |
| Best for | MKV (Matroska) is a flexible open-source video container that supports multiple video, audio and subtitle tracks in a single file. | FLAC is an open-source lossless audio format that compresses without losing quality, roughly halving file size. Ideal for audio archives. |
What happens when converting MKV to FLAC?
The MKV data is decoded inside your browser with WebAssembly and re-encoded to the FLAC specification, so no file is ever uploaded to a server. Both formats rely on comparable compression, so file size and perceived quality stay in the same range. MKV supports animation while FLAC does not, so only the first frame is kept. Audio is re-encoded with the FLAC codec while keeping the original duration, so audio and video stay in sync.
Frequently Asked Questions
What is video to audio conversion?
Video to audio conversion extracts the sound track from a video file, for example from MKV to FLAC, keeping only the audio content.
Are my video files uploaded?
No. This tool processes video files directly in your browser. Your video files are never sent to a server.
Which video formats are supported?
This tool converts the audio of MKV video files to FLAC, all in your browser.
Is it really free and unlimited?
Yes, the tool is completely free and you can convert as many videos as you want, with no limits.
Does it work on mobile too?
Yes, it works on any modern device, including smartphones, tablets and desktop computers.
Which format will the result be in?
The converted file will always be in FLAC format, ready to download and use.
About the video to audio converter
Extract and convert the audio from your MKV videos to FLAC for free. Everything happens in your browser: your files are never uploaded to a server, and you need no downloads or sign-up to get started.
See also:
- Video to Audio Converters
- Compress Videos OnlineCompress MP4, WebM, AVI, MKV, MOV, MPEG, TS and 3GP videos online for free. Reduce video file size while keeping good quality. Everything happens in your browser: videos are never uploaded to a server, and you need no downloads or sign-up to get started.
- Convert MKV to MP3Extract and convert the audio from your MKV videos to MP3 for free. Everything happens in your browser: your files are never uploaded to a server, and you need no downloads or sign-up to get started.
- Convert MKV to WAVExtract and convert the audio from your MKV videos to WAV for free. Everything happens in your browser: your files are never uploaded to a server, and you need no downloads or sign-up to get started.
- Convert MKV to OGGExtract and convert the audio from your MKV videos to OGG for free. Everything happens in your browser: your files are never uploaded to a server, and you need no downloads or sign-up to get started.