MP3 vs WAV: What's the Difference?
Short answer
WAV stores audio uncompressed — perfect fidelity at roughly 10 MB per stereo minute. MP3 discards detail the ear is unlikely to notice, giving files about a tenth the size. Use WAV for editing, MP3 for listening and sharing.
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What each format actually stores
A WAV file contains raw PCM samples — the waveform measured tens of thousands of times per second, written down exactly. Nothing is interpreted or discarded, which is why editors can scrub through it instantly.
MP3 uses a psychoacoustic model: it works out which parts of the sound a listener is unlikely to perceive, and removes them. At 192 kbps and above this is genuinely hard to hear on most equipment.
| MP3 | WAV | |
|---|---|---|
| Compression | Lossy | Uncompressed |
| Size (1 min stereo) | ~1.5 MB at 192 kbps | ~10 MB |
| Editing | Degrades on re-save | No degradation |
| Metadata | Full tags and artwork | Minimal |
| Compatibility | Universal | Universal |
Why converting MP3 to WAV changes nothing
It is a common assumption that converting to an uncompressed format restores quality. It does not, for the same reason converting a JPEG to PNG does not sharpen it.
The MP3 encoder discarded data permanently when the file was created. Converting to WAV writes those same already-degraded samples out uncompressed — a file ten times larger containing identical audio.
There is one legitimate reason to do it: some audio software only accepts uncompressed input. That is a workflow requirement, not a quality improvement.
- Recording or editing → WAV
- Listening, sharing, uploading → MP3 at 192 kbps or higher
- Archiving music → FLAC, which is lossless and usually well under WAV's size
- Feeding software that demands uncompressed input → WAV
Sources
- Xiph.Org — FLAC format overview — checked