Step 1: Supply your Opus files using the button above or by haul and lay.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Get your converted MKV files.
Opus to MKV Conversion FAQ
What does the OPUS to MKV converter do?
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It converts a OPUS file into MKV format.
Will the data inside my OPUS be preserved when converting to MKV?
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Yes — the content is mapped to the MKV equivalent. Format-specific extras that MKV does not represent natively are omitted rather than corrupted.
Is the OPUS to MKV conversion reversible?
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You can convert the MKV back to OPUS on this site. If either format involved is lossy, the round-trip is not bit-perfect even though it is visually or audibly close.
What output quality should I expect from OPUS to MKV?
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Default settings target broadcast / web quality — visually identical to the source for most viewers. For archival use, pick the highest quality option in the converter settings.
Is there a file-size limit when converting OPUS to MKV?
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Free conversions have a size limit per file, set by the type of file, and the page tells you when a file is over it. A paid plan removes that limit, so much larger files can be converted.
Can I batch-convert several OPUS files to MKV at once?
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Several files in one job need a paid plan. Free use is one file per conversion, one conversion an hour. On a paid plan you can add several files to one job, then download each result on its own or all of them in one ZIP.
What happens to my OPUS files after the conversion?
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Uploaded files are processed on our own conversion servers, nobody looks at them, and they are not shared. The upload and the converted file are both deleted automatically about 24 hours after the conversion, which leaves time to download the result. See /privacy/ for the full policy.
Will my MKV play on phones, tablets, and TVs?
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Yes — MKV uses modern codecs that play natively on iOS, Android, Smart TVs, game consoles, and every modern browser.
Do I need to install software to convert OPUS to MKV?
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No. The converter runs entirely in your browser plus our cloud — no plugin, no install, no admin rights. It works on Windows, macOS, Linux, ChromeOS, iOS, and Android.
Do I need an account to convert OPUS to MKV?
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Yes. One conversion an hour is free, with no account needed, for a file within the free size limit. A paid plan removes the hourly limit and the size limit, and lets you add several files to one job.
Is there an API for OPUS to MKV conversion?
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Yes. Every conversion this site offers is also exposed via a JSON API — see /api/ for endpoints, authentication, and rate limits. OPUS to MKV is one of the supported pairs.
What if my OPUS fails to convert to MKV?
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Failures are usually caused by corrupted source files or unsupported OPUS variants. Re-export from the original app and try again; if it still fails, the contact page forwards the file to support so we can diagnose.
