Convert Opus to FLAC
Free online converter for Opus files. Lossless compression with roughly half the size of WAV. Nothing to install, no watermark, and every file is deleted automatically.
Drag and drop your files
or
Upload a Opus file to convert it to FLAC. Up to 3 files at once, 100 MB each.
Free · up to 3 files · 100 MB each · files deleted automatically after 1 hour.
About OPUS and FLAC
Opus .opus
The current state of the art in lossy audio, standardised by the IETF. It outperforms MP3 and AAC across the range and is dramatically better at low bitrates.
Good for
- Best quality per byte of any format here
- Excellent for speech as well as music
- Open, royalty-free, and low latency
Trade-offs
- Lossy
- Older devices and some players will not open it
- Less familiar, so people distrust the file extension
audio/opus
FLAC .flac
Lossless compression for audio. Roughly half the size of WAV, and it decodes back to the original samples exactly — nothing is approximated.
Good for
- Perfect reconstruction — identical to the source
- Around 50–60% of the size of WAV
- Full tagging, and an open royalty-free format
Trade-offs
- Still far larger than MP3 or AAC
- Not supported by every portable player or car stereo
audio/flac
OPUS and FLAC side by side
| OPUS | FLAC | |
|---|---|---|
| Compression | Lossy | Lossless |
| Typically used for | Voice, streaming, bandwidth-limited audio | Archiving, high-fidelity libraries |
What changes when you convert OPUS to FLAC
This is a re-encode, not a repackage
Some tools can move a stream into a different container untouched when the codecs happen to line up. We do not — every job here is decoded and encoded again, so the conversion takes time in proportion to the length of the file and costs a small amount of quality even where a repackage would have been possible. In exchange the output is predictable: it plays everywhere, rather than inheriting whatever the source happened to contain.
What your FLAC will contain
The output is FLAC — which is lossless, so there is no bitrate to set — the size is decided entirely by how compressible your audio turns out to be, usually landing near half of the equivalent WAV while preserving every sample exactly.
Quality cannot come back
OPUS already discarded detail permanently, and FLAC stores exactly what it is given. The result will be considerably larger while sounding identical to the OPUS you started from — lossless preserves, it does not restore. That is still the right move if you are about to edit, because further saves will not degrade it again.