Convert OPUS to FLAC

Tested on Windows 11, 24 October 2026

Convert OPUS audio to FLAC in your browser or in the Filoshi app for Windows. FLAC stores the decoded audio without further loss. Nothing is uploaded.

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

How to convert OPUS to FLAC in your browser

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

Output format

What is FLAC?

Free Lossless Audio Codec (.flac). FLAC compresses audio without losing anything: decoded, it is bit-for-bit identical to the original. Files are typically about half to two thirds the size of WAV. Most music players and phones play it; some Apple apps do not.

Common use: Music archives, lossless downloads, CD rips

Questions about OPUS to FLAC

Is converting OPUS to FLAC 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 OPUS to FLAC lose quality?
No further loss: FLAC keeps exactly what is decoded from the OPUS file. It cannot bring back detail that OPUS's lossy compression already removed, and the FLAC file is usually larger.
Is my OPUS file uploaded anywhere?
No. The converter on this page runs in your browser with FFmpeg compiled to WebAssembly; your OPUS file is read and converted on your device and never sent to a server. The desktop app works the same way, offline.
Has OPUS to FLAC been tested?
Yes. OPUS to FLAC is one of the 1,841 conversions that passed Filoshi's automated test matrix on Windows 11.
Can I convert many OPUS files at once?
Yes, in the desktop app. Drop as many OPUS files as you like on the window, pick FLAC 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 OPUS conversions

OPUS to MP3OPUS to AACOPUS to OGGOPUS to M4AOPUS to AIFFOPUS to AC3OPUS to AUOPUS to CAF

Convert to FLAC

MP3 to FLACWAV to FLACAAC to FLACOGG to FLACM4A to FLACWMA to FLACAIFF to FLACALAC to FLAC

Need OPUS to FLAC 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