Convert Opus to FLAC
Free online audio converter. Turn Opus audio into FLAC right in the browser. Files are never uploaded anywhere.
About Opus and FLAC
Opus is the newest codec here and the most efficient — it outperforms MP3, Vorbis and AAC at low bitrates, which is why WhatsApp, Discord and WebRTC all use it. Support is universal in browsers, patchier in older hardware.
FLAC is lossless compression for audio — bit-identical to the source at roughly half the size of WAV. It is the archival format of choice for music collections and masters.
Converting Opus to FLAC produces a lossless file, though detail already discarded by Opus's compression cannot be recovered — the new file is a faithful copy of the Opus, not of the original recording.
How the conversion works
This tool runs FFmpeg — the same engine behind most media software — compiled to WebAssembly, entirely in the browser. The file is read locally, converted locally and saved straight from memory; nothing is ever uploaded, which also means no queues and no server-side file size limits.
The converter itself is a one-time ~31 MB download on the first conversion, cached by the browser afterwards. Once it is loaded, everything works offline.
More audio converter pages
Free and open source from Earthling Digital, an independent creative agency. Built with Earthling UI.