Are my MKV files uploaded anywhere?

No. This conversion runs entirely inside your browser, so the file never leaves your device. You can confirm it yourself: open the network tab of your browser's developer tools and convert something. You will see the page load, plus the analytics and advertising the site is paid for with — and nothing carrying your file.

Is converting MKV to FLAC free?

Yes. There is no account, no watermark and no limit on how many files you convert — it runs on your own machine, so it costs us nothing to let you. Files up to 100 MB are handled in the browser.

Does converting MKV to FLAC lose quality?

No. FLAC stores the same content without discarding anything, so the result is identical in quality to the original. Only the first soundtrack is kept. A film with a second language or a commentary track loses it.

Do I need to install anything to open FLAC files?

No installation is needed for the conversion itself — it runs in the browser you already have. Opening the FLAC afterwards needs whatever software normally handles Free Lossless Audio Codec on your device.

MKVtoFLAC

Convert MKV to FLAC

Up to 100 files at once. Mixed formats are fine.

You can convert MKV to FLAC free and without an account: drop the file above and the FLAC is ready to download in a second or two. The conversion happens inside your own browser, so the file is never uploaded — it works on Windows, Mac, Linux, iPhone and Android, and keeps working with the network switched off.

What MKV and FLAC are for

An open container that holds anything — several audio tracks, subtitles, chapters. Weak on hardware players.

Lossless compression at about half the size of WAV. The archival choice for music.

How to convert MKV to FLAC

Drop your MKV file onto this page, or click to pick one.
Choose FLAC as the target. The conversion runs inside your browser — the file is never uploaded.
Download the finished FLAC file.

MKV vs FLAC: what changes

MKV compared with FLAC
	MKV	FLAC
Full name	Matroska Video	Free Lossless Audio Codec
File extension	.mkv	.flac
Media type	video/x-matroska	audio/flac
Compression	Lossy — file size is bought with quality	Lossless — nothing is discarded

Quality: Nothing is lost. The result holds exactly the same picture, text or data as the original.
Where it runs: This conversion runs inside your browser. Your file is never uploaded, and it works with the network disconnected.
What can be lost: Only the first soundtrack is kept. A film with a second language or a commentary track loses it.

MKV to FLAC: common questions

Are my MKV files uploaded anywhere?: No. This conversion runs entirely inside your browser, so the file never leaves your device. You can confirm it yourself: open the network tab of your browser's developer tools and convert something. You will see the page load, plus the analytics and advertising the site is paid for with — and nothing carrying your file.
Is converting MKV to FLAC free?: Yes. There is no account, no watermark and no limit on how many files you convert — it runs on your own machine, so it costs us nothing to let you. Files up to 100 MB are handled in the browser.
Does converting MKV to FLAC lose quality?: No. FLAC stores the same content without discarding anything, so the result is identical in quality to the original. Only the first soundtrack is kept. A film with a second language or a commentary track loses it.
Do I need to install anything to open FLAC files?: No installation is needed for the conversion itself — it runs in the browser you already have. Opening the FLAC afterwards needs whatever software normally handles Free Lossless Audio Codec on your device.