Shrink lossless FLAC audio down to a portable MP3 — batch convert, trim, adjust volume, add fades — entirely in your browser, nothing uploaded.
Everything happens locally in your browser using ffmpeg.wasm — a real build of FFmpeg compiled to WebAssembly. Nothing is uploaded to a server at any point; your files never leave your device.
FLAC is lossless — it preserves the exact original audio with zero quality loss — but that comes at the cost of large file sizes, often 5-10x bigger than an equivalent MP3. Converting to MP3 trades a (usually inaudible, if you pick a high enough bitrate) amount of quality for a much smaller, more portable file that works on virtually any device or player.
This tool defaults to 256 kbps rather than a lower "typical" MP3 bitrate, because if you're starting from lossless FLAC you're usually trying to preserve quality, not just save space. 256-320 kbps keeps the loss close to inaudible for most listeners and most gear; drop lower only if file size matters more than fidelity to you.
No. The conversion runs with ffmpeg.wasm entirely inside your browser tab — your FLAC files are read locally and never sent to a server. Closing the tab discards everything that isn't downloaded.