Quick verdict
MP3 for everyday listening (smaller files, universal support). FLAC for audiophile playback, archival, and DJ/producer source libraries where every detail matters.
FLAC is to audio what PNG is to images: lossless compression. It shrinks WAV files by about 50% without throwing any audio data away. MP3, by contrast, is lossy — it makes much smaller files (~10× smaller than WAV) but at the cost of some audio detail.
For most listeners on most equipment, MP3 at 256–320 kbps is indistinguishable from the original. FLAC matters when you have high-end headphones, a quiet listening environment, lossless source files, and the file-size budget to store them.
| Feature | MP3 | FLAC |
|---|---|---|
| Compression | Lossy | Lossless |
| File size (3-min song) | ~4 MB at 192 kbps | ~18 MB |
| Quality | Transparent at high bitrate | Identical to WAV |
| Hardware support | Every device | Most modern, some old fail |
| iPhone native | Yes | Yes (iOS 11+) |
| Streaming services | Spotify, Apple Music | Tidal, Qobuz, Bandcamp |
| Metadata (tags + art) | ID3 | Vorbis comments |
Use MP3 when
- You're building a phone music library and storage matters.
- You're sharing music with someone who may have older hardware.
- You're streaming or listening casually (background music, car, gym).
Use FLAC when
- You're ripping a CD and want a perfect digital copy.
- You're an audiophile with good headphones / amp / DAC.
- You're a DJ or producer using tracks as source material.
- You want to archive music collections losslessly for the long term.
Convert between MP3 and FLAC in your browser
FAQ
- Will converting MP3 to FLAC improve quality?
- No — the MP3 was already lossy. Converting it back to FLAC just packages the already-degraded audio in a larger lossless container. The original detail is gone forever.
- Can I hear the difference between FLAC and 320 kbps MP3?
- In a controlled blind test, most listeners can't. With high-end headphones in a quiet room you may notice differences in cymbal decay or reverb tails, but it's subtle.
- Is FLAC the same as WAV?
- They're both lossless and bit-exact. FLAC files are about 50% the size of WAV thanks to lossless compression. The audio that comes out of a FLAC decoder is identical to the source WAV.
- Does Spotify use FLAC?
- No — Spotify uses Ogg Vorbis (lossy). Tidal and Qobuz and Apple Music (Hi-Res Lossless) deliver FLAC-equivalent streams.