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
What does the WMA to OPUS audio converter do?
+
It re-encodes a WMA audio file as OPUS. Sample rate and channel count are preserved; the difference is the codec and container.
Will the sample rate and channel layout be preserved?
+
By default yes — stereo stays stereo, the original sample rate (44.1 kHz, 48 kHz, etc.) is carried through to the OPUS output.
Is the WMA to OPUS conversion reversible?
+
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?
+
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?
+
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?
+
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.
Most of my WMA files came from CDs — does that matter here?
+
Only in that the encode already happened once. A WMA ripped from a disc was compressed at whatever bitrate the ripper was set to years ago, and that is the ceiling on everything downstream — converting cannot recover what the ripper discarded. If the discs are still on a shelf, re-ripping to a lossless format and encoding from that gives a genuinely better result than any conversion of the existing files. WMA is Windows Media Audio, Microsoft’s answer to MP3, launched in 1999 and bundled with every Windows install of that era.
Why will some of my WMA files not convert?
+
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?
+
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?
+
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?
+
Anonymous uploads are capped at a generous default; signed-in free accounts get a higher cap, and Pro accounts have no per-file limit. Browser memory is usually the practical constraint long before our server-side limits kick in.
Can I batch-convert several WMA files to OPUS at once?
+
Yes. Drop or pick multiple WMA files in one upload — the converter processes them in parallel and returns a ZIP of the OPUS results. There is no need to repeat the upload step per file.
