How to convert WAV to MP3
WAV files are large; MP3 is the smaller, more compatible format most people actually need. Here is how to convert between them.
Why WAV and MP3 are so different in size
WAV is an uncompressed format: it stores the raw audio data directly, which makes files large but exactly reproduces the original sound. MP3 compresses the audio, discarding some detail that is harder for most people to hear, which is why an MP3 of the same recording is often a tenth the size or smaller.
On a Mac with QuickTime or iTunes/Music
QuickTime Player can export a WAV file as an M4A (File, Export As, Audio Only), but not directly to MP3. The Music app can convert to MP3 if "Create MP3 Version" is enabled first in its settings (Preferences, Files, Import Settings, set to MP3 Encoder), then right-click the imported song and choose it from there — a roundabout path for a simple conversion.
On Windows
There is no built-in converter between audio formats in Windows Media Player or the Photos app; both mainly play files rather than convert them. This is a genuine gap, which is why most people search for a dedicated converter rather than a settings menu.
On an iPhone or Android
Neither platform has a native audio format converter. Files that arrive as WAV, FLAC or another format either play as-is in a compatible app, or need converting elsewhere before they will import into an app that expects MP3 specifically.
A direct converter between formats
Stayput's audio converter tool converts between MP3, WAV, FLAC, M4A and OGG directly, in a batch, in the browser, without uploading the files or needing the Music app's roundabout MP3-encoder setting. It also pulls audio out of a video file in the same step if needed.
Questions
Does converting WAV to MP3 lose audio quality?
Yes, some quality is lost since MP3 is a compressed (lossy) format, though at a reasonable bitrate the difference is not noticeable for most listening.
Can I convert MP3 back to WAV?
Yes, but this does not recover any detail that was discarded during the original MP3 compression; it just changes the container and encoding, not the underlying quality.
Why can't I just rename a .wav file to .mp3?
The file extension does not change the actual audio encoding inside the file, so renaming it does not convert anything; the data still needs to be re-encoded by a converter.
Is there a free way to convert audio formats without installing software?
Yes, a browser-based converter works without installing anything and, when it runs locally, does not upload the audio file anywhere to convert it.