Upload your Opus file using the picker above and the converter detects the source type and runs the Opus → MKV pipeline. The result downloads automatically when conversion completes; no account needed for one-off conversions.
Is the Opus to MKV converter free?
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Yes — basic Opus → MKV conversion is free with no registration. Premium adds higher per-file size limits, more parallel batch workers, and removes ads.
How big a Opus file can I convert to MKV?
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Free accounts: up to 100 MB per Opus file. Premium: typically 1 GB per file, depending on the Opus source type. Very large files are split into chunks server-side when the MKV format allows.
Will conversion change the content of my Opus?
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Conversion preserves all information that both Opus and MKV can represent. Format-specific features that the MKV format doesn't support (e.g. vector data in raster output, formulas in plain-text output) are rasterized or stripped — see the format-specific notes on the result page.