Convert OPUS to FLAC for editing software, DJ apps and players that need FLAC. Free, private and in your browser — no upload, no sign-up.
Drop audio or video files here
or paste them, or click to choose — several files at once
Choose filesMP3, WAV, FLAC, OGG, M4A, AAC, OPUS, AIFF, WMA, APE, AMR, MP4 and more · up to 300 MB per file
The converter (about 30 MB) is downloaded once on first use and then cached. Your files never leave your device.
Drop OPUS files onto the converter, paste them, or click to choose. You can add many at once.
FLAC is already selected. If you like, adjust the quality, sample rate or channels before or after adding files.
Each file is converted in your browser in seconds. Save them one by one, or all at once as a ZIP.
Opus Interactive Audio Codec
The most efficient modern codec
Opus is an open, royalty-free codec designed for the internet. It powers WhatsApp voice messages, Discord, video calls in the browser and YouTube streaming.
Free Lossless Audio Codec
Lossless compression for music lovers
FLAC compresses audio without discarding anything: once decoded, it is bit-for-bit identical to the original, yet takes roughly half the space of WAV.
Audio is converted by ffmpeg running inside your browser. Your files never reach a server.
Queue up to 50 files and download them one by one or together as a ZIP.
Set the bitrate, bit depth, sample rate and channels — or simply keep the sensible defaults.
Add your OPUS files to the converter above. FLAC is already selected as the output, so conversion starts right away. When a file is ready, click Download, or use Download all to get a ZIP.
Nothing more is lost: FLAC stores the decoded OPUS audio exactly. It cannot restore detail that the OPUS compression already removed, though — the file gets bigger, not better. Convert to FLAC when software requires it or for editing.
16-bit keeps CD-quality sources exactly; use 24-bit for high-resolution recordings. FLAC is lossless at any setting, so there is no bitrate to choose.
No. The OPUS to FLAC conversion runs entirely in your browser using ffmpeg compiled to WebAssembly. Your files are never sent to a server, so even private recordings stay on your device.
Yes. Add up to 50 files; they are converted one after another, and you can download each FLAC file separately or all of them together as a ZIP archive.