Convert Opus to FLAC
Free Opus to FLAC converter that runs entirely in your browser. No uploads, no signup required.
Drop Opus files here
or browse your device. Free, no signup required, no watermarks.
Files are processed on your device, never uploaded
Media conversions run on a full FFmpeg engine compiled to WebAssembly. The engine (~31 MB) downloads once on your first conversion, then everything runs locally.
Three steps
How to convert Opus to FLAC
Add your files
Drop Opus files into the box above, or click it to browse. Add several to batch convert.
Convert
FLAC is already selected as the output. Hit Convert. Your browser does the work locally.
Download
Save each converted FLAC file. Pro ZIPs whole batches in one click.
Opus audio
Opus
Opus is the most efficient audio codec ever standardized, powering WhatsApp voice notes and Discord calls.
Free Lossless Audio Codec
FLAC
FLAC compresses audio to about half the size of WAV with zero quality loss. It is the audiophile's archive format.
Why convert Opus to FLAC?
Opus is the most efficient audio codec ever standardized, powering WhatsApp voice notes and Discord calls. FLAC compresses audio to about half the size of WAV with zero quality loss. It is the audiophile's archive format. Converting from Opus to FLAC gets you the best of the target format wherever Opus falls short, whether that's compatibility, file size, or what your apps and devices can open. With FormatFusion the switch takes seconds and your files stay on your device the whole time.
Questions
Opus to FLAC: common questions
Is this Opus to FLAC converter free?
Yes. It is completely free with no watermarks and no account required, for files up to 1 GB each. Convert one file or a hundred.
Is it safe to convert Opus files here?
Safer than any upload-based converter. The conversion runs locally in your browser, so your Opus files are never sent over the internet and never touch a server.
Will I lose quality converting Opus to FLAC?
No. This conversion preserves your content, and FLAC output keeps everything the format supports.
Can I convert multiple Opus files at once?
Yes. Free converts up to three Opus files at a time. FormatFusion Pro batches without limits and downloads whole runs as a single ZIP.
Does it work on iPhone and Android?
Yes. FormatFusion runs in any modern mobile or desktop browser. No app install needed.