Convert MKV to MP3 Files Online for Free.
Free online tool to convert mkv to mp3 files quickly and securely. No installation required – start converting your files in just a few clicks!
Drag and drop your files here or click to upload.
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Maximum file size is 10MB
How It Works
How to Convert MKV to MP3
Click inside the file drop area to upload your MKV file or drag & drop it.
Select MP3 as the output format and click the 'Convert' button.
Download the converted MP3 file instantly after conversion.
You can also send a link to the converted file via email. (Optional)
Convert Your MKV files to other formats
RunConvert.com can convert your MKV files to these other formats:
Convert Your MKV files to other formats
Convert Files to MKV Format
RunConvert.com supports these converters to MKV format:
Convert Files to MKV Format
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Frequently Asked Questions
Here are some common questions and answers about mkv file conversions ask by our users on RunConvert.com.
Frequently Asked Questions
Q: What format works best for Windows Media Player?
A: WMV is the classic, but MP4 is usually a better modern option that still plays nice with Windows.
Q: Is there a way to reduce video file size?
A: Yes! Convert it to a compressed format like MP4 (H.264 codec). You’ll keep most of the quality without hogging storage space.
Q: What format should I use for gaming clips?
A: MP4 or WebM works great. If you're posting to YouTube or Twitch, MP4 with H.264 is the safe zone.
Q: What happens if my internet cuts out during conversion?
A: No worries, just re-upload the file when you're back online. Our system doesn’t store incomplete uploads.
Q: Can I use RunConvert to prepare videos for email?
A: Yes—convert to MP4 and compress it under 25MB, and you’re good to attach it to most emails.
Q: Can I use RunConvert for classroom video materials?
A: Yes—many teachers use it to prep lecture clips and lessons in formats that work everywhere.
Q: Will I lose audio when converting a video?
A: Nope. Unless you're converting to a silent format (which is rare), your audio stays intact.
Q: Does RunConvert work in all browsers?
A: Yep! Chrome, Firefox, Safari, Edge—we play nice with all the modern ones.
Q: What if I need subtitles added during conversion?
A: Currently, we don’t embed subtitles—but you can add them later using a subtitle editor.
Q: Can I convert YouTube videos with RunConvert?
A: Sorry, we don't support direct YouTube downloads due to copyright stuff. But if you have the video file on your device, we’re ready for it.
What is MKV (Matroska Video)?
MKV (Matroska Video) is an open-source container format that can hold an unlimited number of video, audio, picture, or subtitle tracks in one file. It is designed to be flexible and is often used for high-definition video content.
MKV is a popular choice for storing HD movies, TV shows, and videos due to its ability to support almost any type of video and audio codec, as well as multiple audio tracks and subtitles within one file.
How to open MKV?
MKV files can be opened with several media players, including VLC Media Player, PotPlayer, and Media Player Classic (MPC-HC).
For macOS users, VLC and IINA are great options to play MKV files. You can also use the official Elmedia Player for MKV playback.
MKV is Developed by: Matroska Association
MKV was Released on: 2003
Useful Links for MKV:
How to convert MKV?
You can easily convert MKV files to other formats like MP4, AVI, or MOV using our online video converter. Simply upload the MKV file, select your desired output format, and start the conversion process.
Our tool ensures quick and high-quality conversion, making MKV files compatible with a variety of devices and platforms.
What is MP3 (MPEG-1 Audio Layer III)?
MP3 (MPEG-1 Audio Layer III) is a popular audio compression format that is widely used for storing music, podcasts, audiobooks, and other audio files. It uses lossy compression, meaning some audio data is discarded to reduce the file size while maintaining reasonable sound quality.
MP3 files are compatible with almost all devices and media players, making it the most commonly used audio format for music distribution and streaming.
How to open MP3?
MP3 files can be opened with nearly every media player, including Windows Media Player, VLC Media Player, iTunes, and others.
On macOS, you can open MP3 files using the default Music app, QuickTime Player, or third-party apps like VLC.
MP3 is Developed by: Fraunhofer IIS and others
MP3 was Released on: 1993
Useful Links for MP3:
How to convert MP3?
You can convert MP3 files using an online audio converter. Simply upload your MP3 file, select the output format you prefer (e.g., WAV, AAC, or OGG), and convert it.
Our converter ensures fast processing with high-quality output that is compatible across various devices and platforms.
What Our Users Say
Don't take our word for it – here's what users think about Runconvert.
Saved me hours of work
I had to convert multiple PDFs to Word for editing. This tool made it so easy and preserved all the formatting perfectly. The batch processing feature is a game changer.
Michael T
Professional quality
As a graphic designer, I need reliable conversion tools. This site delivers professional quality every time. The image conversions maintain resolution and color accuracy.
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Fast and reliable
I've tried many conversion tools but this one is by far the fastest and most reliable. No watermarks, no quality loss, and the interface is so intuitive.
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