Convert Matroska to MP3
We turn Matroska into MP3 right in your browser — the file never goes to a server.
What you will lose
- Surround will be mixed down to stereo — extra channels do not survive this conversion.
- Compression becomes lossy: the original quality cannot be restored
How they differ
| Matroska | MP3 | |
|---|---|---|
| Lossless | yes | no |
| Lossy | yes | yes |
| Multichannel | yes | no |
| Tags | yes | yes |
| Released | 2002 | 1993 |
| Author | CoreCodec | Fraunhofer IIS |
Matroska
Good at
- Takes anything inside: any codec, a dozen tracks, subtitle fonts
- The one common container people fill with lossless audio
- Tracks and subtitles can be swapped without touching the picture
Awkward about
- TVs and phones often refuse to open it
- No browser plays it directly
- Files run larger: what goes inside is usually less compressed
Use it when
- A home archive where everything should be kept as it was
- Several audio languages and subtitle tracks in one file
- The file is watched on a computer, not on household hardware
MP3
Good at
- Plays literally everywhere, from a 2003 car stereo to a smart speaker
- Predictably small: an hour of speech fits in 30 MB
- Every player reads its tags, without exception
Awkward about
- Lossy, and re-encoding it again is audible
- Two channels at most — surround will not survive
- At the same size, Opus and AAC sound better
Use it when
- It has to open for anyone, on anything
- A podcast, an audiobook, a recorded lecture
- The file goes to a person, not into further processing
Common questions
- Does the file get uploaded to a server?
- Yes, this pair needs the server: browsers cannot encode that format. The file and the result are deleted within a couple of hours and never shared.
- Will surround sound survive?
- No. MP3 reliably carries stereo only, so extra channels are mixed down to two.
- Can I get the original quality back afterwards?
- No. MP3 is lossy, and the discarded detail cannot be recovered. Keep the original if you may still need it.
- How many files, and how large?
- Up to 5 files at a time, 500 MB each. No sign-up, no watermarks.