Step 1: Supply your WMA 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 Opus files.
WMA to Opus Conversion FAQ
Is the WMA to OPUS conversion reversible?
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You can convert the OPUS back to WMA 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 WMA to OPUS?
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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 converting WMA to OPUS a second round of lossy compression?
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Yes, and it is worth planning around. Both formats are lossy, so the OPUS encoder is working from audio that has already been through one psychoacoustic pass, and its own decisions compound the first set. At 192 kbps or above the result is still transparent for most listening. If you have a lossless master anywhere, encoding the OPUS from that instead avoids the double pass entirely. WMA is lossy by default, in an ASF container, with lossless and voice-optimised variants that are rarely encountered. Opus scales from 6 kbps mono speech to 510 kbps stereo music in the same bitstream and switches modes automatically.
What exactly is an OPUS file?
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A container with the audio inside it, rather than the audio on its own. That extra layer is where the length, the seek index and whatever metadata the format defines are kept, so a player knows how long an OPUS is before decoding a single frame instead of scanning the whole file to find out. It also means the extension does not always settle what is inside: several containers of this kind are allowed to hold more than one sort of audio, which is why two OPUS files can behave differently while looking identical from outside.
Why will some of my WMA files not convert?
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DRM. A subset of WMA files are encrypted by the store or the software that issued them, and encrypted audio cannot be decoded by any converter. Anything you ripped yourself, recorded, or bought without protection converts normally; a licensed purchase will not. WMA is unsupported almost everywhere outside Windows, and older WMA files may carry DRM that blocks conversion entirely.
Is there a licence attached to WMA?
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Not one you have to think about. The codec is covered by patent pools, and the licensing is settled by whoever ships the decoder — the phone, the browser, the operating system — long before a file reaches you. It is why the format is everywhere in hardware, and why royalty-free alternatives were built at all. It changes nothing about converting a file you already have, and it is only a live question if you are shipping an encoder yourself.
Is OPUS too new for the things I need to play it on?
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That is the one real risk with it. OPUS is a recent codec and it is genuinely better than the older ones at the same bitrate — noticeably so below 96 kbps — but "better" is not "supported", and a car head unit, a standalone player or a television from before it existed will simply not recognise the file. Browsers, phones and computers are fine. Check the oldest device that has to play it and choose on that, not on the numbers. Opus is almost never supported by standalone hardware — assume software playback only, and expect car stereos to ignore it.
Is there a file-size limit when converting WMA to OPUS?
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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 WMA files to OPUS 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 WMA 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.
What apps can play a OPUS file?
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OPUS plays in most music players, browsers, and media libraries. iTunes / Apple Music, VLC, Foobar2000, and phone media apps handle it natively.
Do I need to install software to convert WMA to OPUS?
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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.
