AudioKit

MP3 vs WAV

WAV is the raw recording, sample for sample. MP3 is a compact version built to sound the same to most ears at a tenth of the size. Use WAV while you work on audio, and MP3 once it’s finished and needs to travel.

Size, side by side

WAV 16-bit/44.1k40.4 MB
FLAC (typical)22.9 MB
MP3 320 kbps9.2 MB
MP3 192 kbps5.5 MB
MP3 128 kbps3.7 MB

How each stores sound

WAV is a container for PCM: a list of amplitude measurements, 44,100 or 48,000 per second per channel. Nothing is thrown away and nothing needs decoding, which is why every editor opens it instantly and why it’s large. See how sampling works.

MP3 splits the sound into frequency bands, estimates which ones the ear won’t notice (masked by louder sounds or outside hearing range), and spends its bit budget only on what’s left. Decode it and you get PCM again, but not the same PCM.

When to use which

SituationUseWhy
Editing, mixing, video post-productionWAVNo generation loss, instant seeking
Sending to a studio or client for workWAV / FLACThey’ll re-export it anyway
Sharing, phones, car, streamingMP3Small, plays everywhere
Podcast publishingMP3 (96–128 kbps)Every podcast app supports it
Archiving originalsFLACLossless like WAV, half the size, with tags

Convert either way: MP3 to WAV · WAV to MP3.

Questions people ask

Is WAV better quality than MP3?

A WAV made from the original recording holds all of it; an MP3 is a smaller approximation. At 192 kbps and above, most people can’t hear the difference on typical equipment. A WAV made from an MP3 is no better than that MP3.

Why are WAV files so big?

They’re uncompressed: 44,100 samples × 16 bits × 2 channels every second = 1,411 kbps, or about 10 MB a minute. MP3 at 192 kbps is 1.4 MB a minute.

Should I send MP3 or WAV to a studio or video editor?

WAV (or FLAC if they accept it). Editors work with uncompressed audio, and every lossy export on top of an MP3 adds artefacts.

Which is better for DJing?

Many DJs use 320 kbps MP3 for size and compatibility. Club sound systems can reveal low-bitrate artefacts, so avoid anything below 256 kbps. WAV and AIFF are safest if storage isn’t a concern, but WAV has limited tag support.

Can WAV hold metadata like artist and cover art?

Only partially. WAV supports basic INFO tags, and some apps add ID3 chunks, but support is patchy. MP3, FLAC and M4A handle tags and cover art reliably.