Why software and hardware still ask for WAV
WAV is the plainest audio format there is, just samples, nothing to decode, and plenty of tools insist on it:
- Hardware samplers and drum machines that only load uncompressed files.
- Radio and broadcast playout systems with strict format rules.
- Video editors and DAWs, which run most smoothly on PCM, especially across long timelines.
- CD-burning software and duplication services that expect CD-ready audio.
- Game engines and apps that need short sounds to play with no decoding delay.
Converting also helps when you'll edit an MP3 and export it again: working on a WAV keeps every intermediate save free of another round of MP3 compression.
What converting can't do
An MP3 has already thrown away part of the original sound. Converting it to WAV decodes what's left into plain samples, so the WAV sounds exactly like the MP3, no better. Think of photocopying a photocopy on a perfect machine: the new copy won't get worse, but it can't regain the detail of the original.
So if you still have the original recording, export your WAV from that. If the MP3 is all you've got, the WAV is the best version of it there is, and it won't lose anything more as you work on it.
One courtesy worth extending: if a mastering engineer, radio station or label asks you for WAV files, mention that they started life as MP3s. It changes how they'll treat the audio, and they'd much rather know up front.
Choosing bit depth and sample rate
- 16-bit: CD quality, and more than enough to hold everything an MP3 contains. Right for most uses.
- 24-bit, worth it if the WAV is heading into a mixing session with heavy processing, or if a system asks for it.
- Original sample rate, most MP3s are 44.1 kHz. Keep it unless something specific requires a change.
- 48 kHz, the standard for video. Converting here saves your video editor from resampling the music on the fly.
- Mono, for single-voice recordings, or equipment that asks for one channel.
Need to change the level as well? Normalize Audio saves a WAV at the loudness you choose, and the audio editor trims and fades before exporting.
How much space WAV takes
Uncompressed audio grows with every second. 16-bit stereo at 44.1 kHz takes about 10 MB per minute, and 24-bit takes half as much again. A 4-minute song that's 9.6 MB as a 320 kbps MP3 becomes about 42 MB as a 16-bit WAV, or roughly 64 MB at 24-bit.
A whole playlist adds up quickly, so glance at the estimate before you start and make sure there's room on your disk. Names stay recognisable, intro.mp3 comes out as intro.wav, and a batch downloads as one ZIP. Heading back the other way later? WAV to MP3 shrinks them again.