Convert any audio file to Opus format online for free. Fast, secure, and easy-to-use audio to Opus converter with no software installation required.
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Max file size: 50 MBMax duration: 30 min
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Drag and drop your WMA file, or click to browse for it.
Choose Opus as the output and click Convert. The conversion runs on our servers, so your device does none of the work.
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Your file is used only to make your conversion. It is never published or shared, and the download link expires after one hour.
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How the two formats differ on the things that change your result.
| Specification | WMA (source) | Opus (result) |
|---|---|---|
| Container | ASF | Ogg |
| Developed by | Microsoft | Xiph.Org / IETF |
| Introduced | 1999 | 2012 |
| Audio codecs | WMA, WMA Pro | Opus |
| Compression | Lossy | Lossy |
| Typical bitrate | 64–192 kbps | 64–256 kbps |
| Max sample rate | 48 kHz | 48 kHz |
| Max channels | 8 | 255 |
| Gapless playback | No | Yes |
| Metadata / tags | ASF / WM tags | Vorbis comments |
| Approx. file size | 0.48–1.44 MB per minute | 0.48–1.44 MB per minute |
| Licensing | Proprietary | Royalty-free |
| Plays natively on | Native: Windows · Needs a player: macOS, iOS, Android | Native: Web browsers, Android · Needs a player: Windows, macOS, iOS |
| Best for | Windows media libraries, legacy archives | voice and calls, podcasts, web delivery |
Both WMA and Opus are lossy, so this conversion decodes WMA and re-encodes it as Opus. That second encode adds its own loss on top of the first. Choosing a higher bitrate, up to 256 kbps, keeps the damage small enough to be inaudible in most material.
Compatibility is the main win here: Opus plays natively on web browsers and Android, where WMA needs a separate player, so the result works without asking anyone to install anything.
The two formats are aimed at different jobs. WMA is typically used for Windows media libraries, legacy archives, while Opus is the usual pick for voice and calls, podcasts, web delivery. That difference in intent is what most of the specification gaps above come from.
Expect metadata to be rewritten rather than copied: ASF / WM tags in the source becomes Vorbis comments in the result. Standard fields map cleanly; niche custom tags often do not.
Moving to Opus moves you onto an open, royalty-free format, which matters if the files need to outlive any single vendor.
This page converts WMA files, stored in the ASF container since 1999, into Opus, which uses Ogg and dates from 2012. The differences between the two containers decide what changes in the result.
WMA comes from Microsoft and dates to 1999. It holds lossy-compressed audio (WMA or WMA Pro), and that sets the ceiling for anything converted out of it.
Opus comes from Xiph.Org / IETF and dates to 2012. It carries lossy-compressed audio (Opus), and without installing anything it plays on web browsers and Android.
After converting your file, you can use Scriptivox transcription services to convert your audio to text. Perfect for meetings, interviews, podcasts, and more.
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