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You care about audio quality. Or you're archiving a music collection. Or someone sent you a FLAC file and you're wondering why it's three times bigger than an MP3. FLAC compresses audio without losing a single sample — decompress it and you get the exact original back, bit for bit.
The difference between FLAC and MP3 is the difference between a ZIP file and a JPG. MP3 throws away data permanently to achieve small files. FLAC rearranges the data more efficiently without discarding anything, achieving roughly 50–70% of the original file size. Whether you can actually hear the difference between FLAC and a high-bitrate MP3 is the subject of endless audiophile debate. Blind tests suggest most people can't at 320 kbps. But for archiving, the debate is irrelevant — you want the master copy, not a compressed approximation.
VLC plays FLAC on every platform. Foobar2000 (Windows) is the enthusiast's choice. Apple Music supports FLAC playback but Apple's own lossless format is ALAC — same idea, different brand. If you need to share audio with someone who just wants to listen, convert to MP3 with fwip. If you want to keep the definitive version, FLAC is the format that preserves everything.
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