Steven Frady

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Convert FLAC to Opus Online

Free online audio converter. Turn FLAC audio into Opus right in your browser. Files are never uploaded anywhere.

Choose an audio or video file, or drop it here
Output
Other conversions
MP3 → WAVMP3 → AIFFMP3 → FLACMP3 → OGGMP3 → M4AMP3 → OpusWAV → MP3WAV → AIFFWAV → FLACWAV → OGGWAV → M4AWAV → OpusAIFF → MP3AIFF → WAVAIFF → FLACAIFF → OGGAIFF → M4AAIFF → OpusFLAC → MP3FLAC → WAVFLAC → AIFFFLAC → OGGFLAC → M4AOGG → MP3OGG → WAVOGG → AIFFOGG → FLACOGG → M4AOGG → OpusM4A → MP3M4A → WAVM4A → AIFFM4A → FLACM4A → OGGM4A → OpusOpus → MP3Opus → WAVOpus → AIFFOpus → FLACOpus → OGGOpus → M4AMP4 → MP3MP4 → WAVMP4 → AIFFMP4 → FLACMP4 → OGGMP4 → M4AMP4 → OpusMOV → MP3MOV → WAVMOV → AIFFMOV → FLACMOV → OGGMOV → M4AMOV → OpusWebM → MP3WebM → WAVWebM → AIFFWebM → FLACWebM → OGGWebM → M4AWebM → OpusMKV → MP3MKV → WAVMKV → AIFFMKV → FLACMKV → OGGMKV → M4AMKV → Opus

About FLAC and Opus

FLAC is lossless compression for audio — bit-identical to the source at roughly half the size of WAV. It's the archival format of choice for music collections and masters.

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.

Converting FLAC to Opus is lossy. 192 kbps is transparent for most listeners on most material; pick 320 kbps if you want the ceiling, or drop lower when small files matter more than fidelity.

How the conversion works

This tool runs FFmpeg — the same engine behind most media software — compiled to WebAssembly, entirely in your browser. Your 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 your first conversion, cached by the browser afterwards. Once it's loaded, everything works offline.

A free tool by Steven Frady, a creative developer building apps, shaders, and interactive installations. See the work.