FLAC Frontend stands for audio codec, an audio format. FLAC is designed specifically for audio, and you can play back compressed FLAC files in your favorite player. It accepts WAVE, W64, AIFF, and RAW files for encoding and outputs FLAC or OGG-FLAC files. It is able to decode FLAC files, test them, fingerprint them, and re-encode them. It also supports drag and drop.