Convert WMA to OPUS

Tested on Windows 11, 24 October 2026

Convert WMA audio to OPUS in your browser or in the Filoshi app for Windows. OPUS is lossy: Filoshi uses a high-quality setting, and you can choose the bitrate. Nothing is uploaded.

Get Filoshi · $29Many files at once, no size limit, on Windows.

How to convert WMA to OPUS in your browser

  1. 1
    Drop your WMA file
    Drag it onto Filoshi above, or press Choose your WMA file to pick it on your computer.
  2. 2
    Filoshi converts it
    OPUS is chosen already. FFmpeg, compiled to WebAssembly, converts it inside this browser tab.
  3. 3
    Save your OPUS file
    Download it when it is ready. Nothing was sent to a server.
Source format

What is WMA?

Windows Media Audio (.wma). WMA is Microsoft's Windows Media audio format from the Windows Media Player era. Windows plays it, but phones, Macs and many music apps do not, so WMA libraries are usually converted to MP3 or AAC.

Common use: Older Windows music libraries

Output format

What is OPUS?

Opus Audio (.opus). Opus is an open, royalty-free codec standardised by the IETF in 2012. It sounds very good at low bitrates for both speech and music, and it is the codec of WebRTC video calls and many voice-message apps.

Common use: Voice messages, calls, streaming, podcasts

Questions about WMA to OPUS

Is converting WMA to OPUS free?
Yes, one file at a time: the converter on this page runs in your browser, files up to 100 MB, no sign-up. The Filoshi desktop app ($29 once, for Windows) converts many files at once and has no size limit.
Does converting WMA to OPUS lose quality?
Yes, a little. OPUS is a lossy format, so some detail is thrown away when the file is saved. Filoshi uses a high-quality setting by default, and you can choose the bitrate in the file viewer. WMA is lossy too, so this is a second round of compression; convert from the original, not from earlier conversions.
Is my WMA file uploaded anywhere?
No. The converter on this page runs in your browser with FFmpeg compiled to WebAssembly; your WMA file is read and converted on your device and never sent to a server. The desktop app works the same way, offline.
Has WMA to OPUS been tested?
Yes. WMA to OPUS is one of the 1,841 conversions that passed Filoshi's automated test matrix on Windows 11.
Can I convert many WMA files at once?
Yes, in the desktop app. Drop as many WMA files as you like on the window, pick OPUS once for all of them, and each file shows its own progress. The new files appear next to the originals, which are never changed.

Related conversions

Other WMA conversions

WMA to MP3WMA to AACWMA to OGGWMA to FLACWMA to M4AWMA to AIFFWMA to AC3WMA to AU

Convert to OPUS

MP3 to OPUSWAV to OPUSAAC to OPUSOGG to OPUSFLAC to OPUSM4A to OPUSAIFF to OPUSALAC to OPUS

Need WMA to OPUS for many files?

The browser converter handles one file at a time. The Filoshi app for Windows converts as many as you drop, runs offline, and has 1,841 tested conversions.

Get Filoshi · $29