MP3 to FLAC

Re-encode an MP3 file as FLAC, a lossless compressed format. Note that the MP3 source is already lossy — this conversion preserves whatever quality is in the MP3 but cannot restore detail the original encoder discarded. FLAC is still useful here for archival, for pipelines that require a lossless container, or for libraries that prefer FLAC. Runs entirely in your browser using ffmpeg.wasm; nothing is uploaded. Expect a few seconds for a 5-minute song; longer files may take a minute or two.