MKA
Matroska Audio
The audio-only counterpart to MKV, able to hold multiple tracks and chapters.
Commonly used for
Multi-track audio, audiobooks
MKA to OPUS Converter
Convert MKA files to OPUS free in your browser — no signup, no install, and the file is never uploaded to a server. OPUS compresses further, so the file gets noticeably smaller.
Completely free
Files are never uploaded
No signup required
Drop files or click to select
MKA → OPUS
What changes in this conversion
- OPUS uses lossy compression, so some audio detail is discarded permanently in exchange for a much smaller file.
- OPUS is a newer format — check that the software or device you are sending it to supports it before switching.
- Both MKA and OPUS are lossy, so re-encoding discards a little more audio detail on top of what was already lost. Converting once is fine; repeating it many times is not.
How to use
-
Add your MKA file
Drag the MKA file onto the drop area above, or click it to pick a file from your device. You can add several files at once.
-
Confirm OPUS as the output
OPUS is already selected as the output format on this page. You can pick the bitrate — higher keeps more of the sound, lower makes a smaller file.
-
Run the conversion
Press the convert button. Audio decodes and re-encodes in your browser — a normal song finishes in a few seconds.
-
Download the OPUS file
When it finishes, download the OPUS file. Converting multiple files gives you the option to download them together as a ZIP.
About these formats
OPUS
Opus Audio
A modern codec offering the best efficiency available today for both speech and music. Discord, WhatsApp, and other real-time voice services use it.
Commonly used for
Voice calls, podcasts, low-bandwidth audio
Frequently asked questions
Is converting MKA to OPUS really free?
Yes. MKA to OPUS conversion is completely free with no signup, no watermark, and no daily limit on the free plan for ordinary use.
Are my MKA files uploaded to a server?
No. The conversion runs entirely inside your browser using WebAssembly, so the MKA file never leaves your device. That is also why it works without an internet connection once the page has loaded.
Does converting MKA to OPUS reduce quality?
OPUS uses lossy compression, so some detail is discarded. At high quality settings the difference is usually invisible, and the file becomes far smaller.
Will the OPUS file open everywhere?
OPUS is a newer format. Current browsers and phones handle it, but older desktop software may not — keep the original MKA if you have to send it to someone on an old machine.
Is there a file size limit for MKA to OPUS conversion?
The free plan handles files up to 200MB. Because processing happens on your own device, very large files depend on your computer's memory rather than a server quota.
Convert MKA files to other formats
Convert other formats to OPUS
Audio converter
What each file format is, what it is used for, and which formats it can be converted to.
Open converter Browse the full format reference