How do I convert FLAC to Opus?

Upload your FLAC file using the box above, confirm Opus as the output format, then select Convert. The converted file is ready to download as soon as processing finishes — usually in a few seconds.

Is converting FLAC to OPUS free?

Yes, and there is nothing to sign up for. Every conversion route is free on every plan — paying raises limits such as file size and how many conversions you get, and removes advertising. It never unlocks a format, adds a watermark or degrades the output.

Will the quality change when converting to Opus?

OPUS uses lossy compression, so some data is discarded to keep the file small. The default quality setting is tuned to be visually or audibly transparent for most material, and you can raise it in the conversion settings.

What happens to my file afterwards?

The uploaded file is deleted as soon as the conversion completes, and the converted file is removed automatically once its retention window ends. Download links are signed and expire within minutes.

flacopus

Convert FLAC to Opus

Free online converter for FLAC files. Low-latency codec with excellent quality at low bitrates. Nothing to install, no watermark, and every file is deleted automatically.

Drag and drop your files

Upload a FLAC file to convert it to Opus. Up to 3 files at once, 100 MB each.

Free · up to 3 files · 100 MB each · files deleted automatically after 1 hour.

About FLAC and 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 .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 and OPUS side by side

FLAC compared with Opus
	FLAC	OPUS
Compression	Lossless	Lossy
Typically used for	Archiving, high-fidelity libraries	Voice, streaming, bandwidth-limited audio

What changes when you convert FLAC to OPUS

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 OPUS will contain

The output is Opus — encoded with Vorbis at 192 kbps by default. Vorbis is royalty-free and holds up slightly better than MP3 at the same bitrate, though Opus has largely superseded it for new work.

This step is irreversible

FLAC holds every sample; OPUS keeps a close approximation. The file gets dramatically smaller, and converting back later will not undo it. Keep the FLAC original if it is a master you will work from again.

Other FLAC conversions

Other ways to get Opus

Worth reading next

What 192 kbps actually means, and when you need more
Bitrate is the single dial that decides how big an audio file is and how good it sounds. Here is what the numbers mean, why they are not comparable between codecs, and where the real thresholds sit.
6 min read