Free MKV to FLAC Converter Online

Fast, Free, Secure & Simple

How to Convert MKV to FLAC

Extract lossless audio from MKV into FLAC.

Upload your MKV file
Click Upload and select your MKV file from your device.
Confirm FLAC as output
The FLAC format is auto-selected for this page—confirm it (or choose if needed). FLAC keeps high fidelity.
Convert and download
Click Convert Now and download your FLAC file. Play in FLAC-ready software. Note: Video discarded.

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💡 Example: Save MKV concert audio as FLAC.

Looking for a fast and reliable MKV to FLAC converter? You’re in the right place! Change My File makes it super easy to convert MKV to FLAC online for free—no software download, no signup, and no hassle.

With our online tool, you can extract high-quality FLAC audio from your MKV video files in just a few clicks. Whether you're an audiophile or simply want lossless sound, our MKV audio converter is designed to deliver crystal-clear results.

Why Convert MKV to FLAC?

MKV files often contain high-resolution video with multiple audio tracks. If you only need the audio portion in a lossless format, FLAC is your best bet. Here’s why users love converting MKV to FLAC:

Lossless Audio Quality – Perfect for preserving every detail.
Smaller File Size than WAV – Ideal for music lovers with limited storage.
Better Compatibility – Easily play FLAC on most music players and editing software.

How to Convert MKV to FLAC Online Free

Our free tool makes the process effortless:

Upload your MKV file
Click “Convert”
Download your FLAC file instantly

No waiting, no watermarks, and 100% free MKV to FLAC conversion.

Features of Our Free MKV Audio Converter

Free and Unlimited Conversions
Secure File Upload (HTTPS)
No Registration Required
Supports Large MKV Files
High-Speed Processing

Convert MKV to FLAC Without Losing Quality

Unlike other tools that compress and degrade your audio, Change My File ensures lossless conversion every time. Our tool preserves every frequency, tone, and beat for studio-grade audio output in FLAC format.

No Software Needed – Convert MKV Files to FLAC Online

Tired of downloading bulky software? Our online MKV to FLAC converter works straight from your browser. Compatible with Chrome, Safari, Edge, and Firefox.

MKV to FLAC Converter FAQs

Is the MKV to FLAC conversion tool really free?

Yes, it's 100% free with no hidden costs or signup requirements.

Can I use this tool on mobile?

Absolutely! Our tool is mobile-friendly. Just upload your MKV file and convert it to FLAC in seconds.

Will my files be safe?

Yes. We use secure HTTPS encryption and automatically delete files after conversion.

Try the Best Free MKV to FLAC Converter Today

Join thousands of users who trust Change My File for safe, fast, and accurate MKV to FLAC conversion. Start converting today and experience high-quality audio like never before.

File extension	.flac
File category	Audio
Stands for	Free Lossless Audio Codec
Developer	Xiph.org
Overview	It is an audio format which uses a lossless compression technique to compress the original data, without any loss of information. The additional benefit of this format is it maintains a very good quality of Audio. These files are encoded using FLAC algorithm that reduces the size of the primary file ranging from 50 to 80 per cent as the size varies according to the amount and density of the data. Therefore, this codec helps in the production of exact replicas of original data but in reduced size. It also supports a number of electronic devices. For instance- Portable players, car stereos etc. As well as it is streamable which allows users to jump to the middle of a stream with minimum delay.
Technical description	FLAC can deal with any channels from 1 to 8. It also supports PCM bit resolution up to 32 bits per sample and any sampling rate up to 655,350Hz in a single Hertz increment. REPLAYGAIN is an added feature in it which helps to measure and normalize the loudness of received audio. Moreover, it can deflate audio at very high speed which makes it to stand out from the other formats. Also, it is an open-source software which means original source code is freely available and it may be modified as per user’s requirements. Lastly, it has flexibility in metadata that allows one to write its own application when it is registered ID. Its metadata includes tags, cover art, seek tables and cue sheets.
Links	wikipedia.org (opens in new tab - official documentation)

File extension	.mkv
File category	Video
Stands for	Matroska Multimedia Container
Developer	Steve Lhomme
Overview	An unlimited amount of data such as an infinite number of audios, videos, pictures, arbitrary files like XML and subtitle tracks can be stored in MKV files. Although, it has a similar concept that of AVI, MP4; etc., yet, there is one difference. It is an open-source software or has open specifications, whereas, others are different. Furthermore, it allows online streaming and fast seeking which are alluring features. It can be used with ease as it is highly adaptive and can accept any audio and video.
Technical description	Files in MKV format store each track in varied dataline. Files in this format use distinctive extensions for storing the data. The extension .MKV is used only for video files(may have subtitles and audio),.MK3D for stereoscopic video, .MKA and .MKS for audio and subtitles respectively. The codecs that are linked to this format are .SRT, Vobsub, .USF(Universal Subtitle Format) and .SSA; etc. It should be noted that not all the media players support this file format but only selective ones like VLC. Besides this, ‘Matroska' is derived from a Russian word that is ‘Matryoshka’ and it refers to a hollow Russian doll which opens to uncover another doll, this doll then again opens to reveal next doll and the process goes on. Other meanings for this word in Russia are a sailor suit and a female sailor. Technical details in depth are available only for private and commercial use.
Links	wikipedia.org (opens in new tab - official documentation)

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