MP3 vs FLAC
How do MP3 and FLACcompare? Here's everything you need to know to choose the right format — and how to convert between them.
.mp3
Full guide →MPEG Audio Layer III
MP3 is the most popular audio format in the world. It revolutionized digital music by compressing audio files to a fraction of their original size while maintaining good quality. Nearly every device and application supports MP3.
.flac
Full guide →Free Lossless Audio Codec
FLAC is the leading open-source lossless audio format. It compresses audio files to about 50-60% of their original size without any quality loss — perfect for audiophiles and music archival.
| Specification | MP3 | FLAC |
|---|---|---|
| Full name | MPEG Audio Layer III | Free Lossless Audio Codec |
| Extension | .mp3 | .flac |
| MIME type | audio/mpeg | audio/flac |
| Category | Audio | Audio |
| Developer | Fraunhofer Society / Moving Picture Experts Group | Xiph.Org Foundation |
| Year introduced | 1993 | 2001 |
| Compression | Lossy | Lossless |
MP3 advantages
- Universal compatibility — works everywhere
- Excellent compression ratios
- Metadata support (ID3 tags)
- Variable and constant bitrate options
MP3 limitations
- Lossy compression — some quality loss
- Not suitable for professional audio production
- Patent-encumbered (patents expired 2017)
- Inferior quality to modern codecs at same bitrate
FLAC advantages
- Lossless — identical to original audio
- 50-60% smaller than WAV
- Open source and royalty-free
- Excellent metadata and tagging support
FLAC limitations
- Larger than lossy formats like MP3
- Not supported by all portable devices
- Slower to encode than lossy formats
- iTunes/Apple Music prefer ALAC
Which should you use?
MP3 is practical for everyday listening with good compression. FLAC is essential for professional audio work where every detail matters.
Best uses for MP3
Best uses for FLAC
Convert between MP3 and FLAC
Need to switch formats? Convert for free with SquishConvert.