FLAC vs MP3
FLAC and MP3 both compress audio, but FLAC is lossless while MP3 is lossy. FLAC shrinks files without throwing away any sound, preserving full fidelity. MP3 discards inaudible detail to make far smaller files. The choice is fidelity versus storage.
Use FLAC for archiving and critical listening where you want bit-perfect, CD-quality audio and have the storage. Use MP3 for everyday listening, portable devices, and streaming where small file size and universal support matter most.
FLAC vs MP3: side-by-side comparison
| Attribute | FLAC | MP3 |
|---|---|---|
| Compression | Lossless | Lossy |
| Quality | Identical to source | Reduced (inaudible data removed) |
| File size | ~50-60% of WAV | Much smaller (~10% of WAV) |
| Re-encoding loss | None | Compounds each save |
| Compatibility | Wide but not universal | Universal |
| Best for | Archiving, audiophile listening | Portable, streaming, sharing |
What is FLAC and what is MP3?
FLAC
FLAC (Free Lossless Audio Codec) compresses audio with zero quality loss, typically to about half the size of the original WAV. Decoded, it is bit-for-bit identical to the source, making it ideal for archiving and high-fidelity listening, though files remain larger than MP3.
MP3
MP3 uses lossy compression to achieve very small files with good perceived quality at higher bitrates. It is supported on every device and service, making it the practical choice for portable playback and streaming, but it cannot recover the detail it discards.
When to use which
Choose FLAC
Choose FLAC to archive your music collection at full quality or for serious listening on good equipment, when storage is not a concern.
Choose MP3
Choose MP3 for phones, cars, streaming, and sharing, where small size and guaranteed compatibility outweigh perfect fidelity.
Convert between these formats
Use our free, browser-based converters: