Opus to FLAC Converter
Convert Opus to FLAC free — no upload, no signup
To convert Opus to FLAC, drop your Opus audio files into the box below and click Convert. Fylo converts with ffmpeg running inside your browser, so nothing is uploaded and there's no signup or watermark. Store Opus audio losslessly as FLAC.
Drop audio files here
or tap to browse · paste with Ctrl+V · add many at once
Your files never leave your device
FLAC is lossless — no bitrate to choose. Sample rate and channels are under Advanced.
Advanced
How to convert Opus to FLAC
Add your Opus files
Drag and drop Opus files into the box or tap to choose them. The converter engine (about 31 MB) downloads once, the first time you convert.
Check the settings
FLAC is lossless, so there's no bitrate to pick. Change sample rate or switch to mono under Advanced if a device needs it.
Convert and download
Click Convert, then download each FLAC file or all of them as one ZIP.
Why convert Opus to FLAC?
Some archives and editors accept FLAC but not Opus.
What happens when you convert Opus to FLAC?
The decoded audio is saved as FLAC at 48 kHz, much larger than the Opus.
How does Fylo convert Opus to FLAC?
Fylo decodes the Opus audio in the Opus with ffmpeg compiled to WebAssembly and encodes it with FLAC lossless compression. Nothing is added back: the FLAC is an exact but larger copy of the decoded Opus (≈ 18–24 MB for a 3-minute song versus ≈ 2.9 MB at 128 kbps). The original sample rate and channel layout are kept unless you change them under Advanced.
What's the difference between Opus and FLAC?
Opus is an open, royalty-free codec standardised by the IETF as RFC 6716 in 2012. It blends speech technology from Skype's SILK with music coding from Xiph's CELT, so it handles both voice and music well. Files are usually stored in the Ogg container with the .opus extension.
FLAC (Free Lossless Audio Codec) was released in 2001 and later maintained by the Xiph.Org Foundation. It compresses PCM audio like a ZIP file compresses data: nothing is thrown away, so a FLAC decodes to exactly the same samples as the source WAV, typically at 50–70% of the size.
Learn more: Opus format guide · FLAC format guide
| Property | Opus | FLAC |
|---|---|---|
| Compression | Lossy | Lossless |
| Typical bitrate | 24–160 kbps | ≈ 700–1,100 kbps |
| 3-minute song | ≈ 2.9 MB at 128 kbps | ≈ 18–24 MB |
| Tags and cover art | Yes (Vorbis comments) | Yes (with cover art) |
| Compatibility | Browsers, Android, WhatsApp, Discord; partial on Apple | Android, Windows 10+, macOS, most players and hi-fi gear |
| Best for | Voice notes, podcasts, streaming at low bitrates | Archiving music without quality loss |
| Introduced | 2012 | 2001 |
Frequently asked questions
Does converting Opus to FLAC improve quality?
No. Opus is lossy, so detail removed during its compression can't be restored. The FLAC is a lossless copy of what the Opus sounds like — bigger, but not better.
Why 48 kHz?
Opus always decodes at 48 kHz.
Is my Opus file uploaded to a server?
No. Fylo runs ffmpeg, the same engine used by professional video tools, compiled to WebAssembly inside your browser. Your Opus file is read directly from your device and never sent anywhere.
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