MKV to MP3 Converter – Free, Fast & Private
Extract the audio track from MKV (Matroska) videos as MP3, locally in your browser — nothing is uploaded
How to convert MKV to MP3
Choose or drag in your MKV file — nothing is uploaded, it stays on your device.
Conversion starts instantly — the audio is extracted and encoded to MP3 right in your browser, with live progress.
Download your MP3 file.
Everything happens right here in your browser: your file is converted locally on your device with WebAssembly FFmpeg and is never uploaded to any server. Because there is no upload, there is no practical length limit either — multi-hour recordings and files up to 8GB convert just fine, and even a huge file starts instantly. Read more: how in-browser conversion works →
About MKV to MP3 conversion
MKV is the container of choice for high-quality video: film archives, recorded streams, anime, concert captures. It holds almost any codec, which is exactly why phones and simple players so often refuse it — and why pulling the soundtrack out as an MP3 is usually the fastest way to get something you can actually listen to.
The extraction runs on your own device with WebAssembly FFmpeg. MKV files are frequently several gigabytes, and that is precisely the case online converters handle worst: here there is no upload at all, so a 6GB file starts immediately and only its audio stream is decoded.
Frequently asked questions
The first audio track in the file, which is what players select by default and is normally the main language. If you need a specific alternate track, remux the MKV with just that track selected and then convert it here.
The ones MKV actually carries in practice: AAC, MP3, AC-3, E-AC-3, DTS, Vorbis, Opus, FLAC and PCM. All of them are decoded and re-encoded to a standard 192kbps MP3.
MKV is a container, not a codec, and mobile players only implement a narrow set of the codec combinations it permits. Converting to MP3 sidesteps the problem entirely when it is the audio you were after.
No. The conversion runs entirely in your browser using WebAssembly (FFmpeg). Your recording never leaves your device — that is also why there is no upload wait, no queue and no file-size pricing. For personal recordings, lectures and meetings this matters more than anywhere else.
Up to 8GB on desktop browsers and 2GB on mobile — big enough to pull the audio out of a multi-hour lecture or meeting recording. There is no limit on the number of files, no signup and no watermark.
192kbps, which is transparent for speech and very close to transparent for music. The audio stream is decoded once and encoded once — there is no extra generation loss from server-side re-processing.
Yes — completely free and unlimited, with no watermark, signup or daily quota. Because the conversion runs on your own device instead of our servers, there are no processing costs to charge for.
Yes. It runs in any modern browser — Chrome, Safari, Edge or Firefox — on Windows, macOS, ChromeOS, Linux, iOS and Android. There is nothing to install.
Audio-only work is fast: there is no video to re-encode, so even the soundtrack of a long video converts in well under real time. Files whose audio is already MP3 are rewrapped without re-encoding and finish in seconds.