MKV to MP3 Converter
Extract and convert the audio track from MKV (Matroska) video files to MP3 format. Powered by FFmpeg WebAssembly. Listen to audio from MKV movies or TV shows on any device.
Drop your audio file here
or click to browse
Complete Guide: MKV to MP3 Converter
Everything you need to know about using this tool effectively
The MKV to MP3 Converter extracts the audio track from Matroska MKV video files and converts it to MP3. MP3 is supported by every device and platform, making it the easiest format for playing or sharing audio from MKV movies and videos anywhere. All conversion runs in your browser using FFmpeg via WebAssembly.
MKV (Matroska Video) is a flexible video container widely used for movies, TV shows, and downloaded video content. The audio inside an MKV can be encoded in various codecs. This tool uses FFmpeg to extract and decode the audio track and re-encode it as MP3 for universal compatibility.
Listen to MKV movies on a portable player
Extract and convert MKV audio to MP3 for playback on portable media players, smart speakers, or car stereos that support MP3 but not video files.
Save music from MKV concert recordings
Extract the audio from MKV concert videos as MP3 to add to your music library.
Convert video lectures to audio
Extract MP3 audio from MKV lecture recordings to listen on the go without needing to watch the video.
Share audio from MKV clips
Extract and convert a short MKV clip's audio to MP3 for sharing via email or messaging where sending full video files is impractical.
Upload MKV audio to podcast platforms
Podcast hosts and audio sharing sites accept MP3 but not MKV. Extract and convert the audio to MP3 before uploading.
Upload MKV file
Click to browse or drag and drop your MKV file into the upload area.
Wait for FFmpeg to load
On first use, the FFmpeg WebAssembly binary loads from a CDN. This takes a few seconds.
Convert
Click Convert to MP3. FFmpeg extracts the audio track and encodes it as MP3.
Download MP3
Download your MP3 file for playback or sharing on any device.
Only the first (default) audio track is extracted from the MKV.
If the MKV audio is already MP3, a second round of lossy compression is applied. For editing, extract to WAV first.
Large MKV files take more time to process in the browser. Very large files are faster with a desktop FFmpeg tool.
Multichannel audio in the MKV is downmixed to stereo in the MP3 output.
Keep a copy of your original MKV file after converting.
Will the MP3 include the full audio from the MKV?
Yes. The entire audio track from the MKV is extracted and encoded as a single MP3 file, preserving its full duration.
Does extracting MKV audio to MP3 lose quality?
If the MKV audio is already a lossy codec such as AAC or AC3, re-encoding to MP3 applies a second round of compression. If the MKV audio is lossless (PCM or FLAC), only one round of lossy encoding occurs.
Are my files uploaded to a server?
No. FFmpeg runs in your browser via WebAssembly. Files are processed locally.
Why does the first conversion take longer?
The first conversion loads the FFmpeg WebAssembly binary. This takes a few seconds. Subsequent conversions are immediate.
Can I extract a subtitle track instead of the audio?
No. This tool extracts audio only. For subtitle extraction, use a desktop tool such as MKVToolNix.