Convert FLAC to Opus
Free FLAC to Opus converter that runs entirely in your browser. No uploads, no signup required.
Drop FLAC 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 FLAC to Opus
Add your files
Drop FLAC files into the box above, or click it to browse. Add several to batch convert.
Convert
Opus is already selected as the output. Hit Convert. Your browser does the work locally.
Download
Save each converted Opus file. Pro ZIPs whole batches in one click.
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.
Opus audio
Opus
Opus is the most efficient audio codec ever standardized, powering WhatsApp voice notes and Discord calls.
Why convert FLAC to Opus?
FLAC compresses audio to about half the size of WAV with zero quality loss. It is the audiophile's archive format. Opus is the most efficient audio codec ever standardized, powering WhatsApp voice notes and Discord calls. Converting from FLAC to Opus gets you the best of the target format wherever FLAC 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
FLAC to Opus: common questions
Is this FLAC to Opus 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 FLAC files here?
Safer than any upload-based converter. The conversion runs locally in your browser, so your FLAC files are never sent over the internet and never touch a server.
Will I lose quality converting FLAC to Opus?
Opus is a lossy format, but we encode at high bitrate (up to 192 kbps), which is transparent for normal listening.
Can I convert multiple FLAC files at once?
Yes. Free converts up to three FLAC 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.