WAV to MP3: small files that still sound good
A three-minute song as a 16-bit WAV is about 30 MB. As a 320 kbps MP3 it is about 7 MB, and at 192 kbps it is closer to 4.3 MB. That difference is why people convert WAV to MP3: to email a demo, upload to a podcast host, fit more music on a phone or send stems to a collaborator over a slow connection.
WAV is the right format while you are recording and mixing. MP3 is the right format once the work is done and people need to hear it.
What WAV and MP3 actually are
WAV (Waveform Audio File Format) came from Microsoft and IBM in 1991 and is built on the RIFF container. It normally holds uncompressed PCM, often 16-bit / 44.1 kHz for music or 24-bit / 48 kHz for video and studio work.
MP3 is a lossy codec standardised by MPEG in 1993, with most of the work done at Fraunhofer IIS. It uses a psychoacoustic model to remove parts of the sound that are masked by louder parts. Its patents have expired, and it plays on practically every device made in the last twenty years.
| Feature | WAV | MP3 |
|---|---|---|
| Compression | Uncompressed PCM | Lossy, perceptual |
| Typical settings | 16-bit / 44.1 kHz or 24-bit / 48 kHz | 128 to 320 kbps at 44.1 or 48 kHz |
| Size per minute | 10.1 MB (16/44.1), 16.5 MB (24/48) | 0.96 MB (128), 1.44 MB (192), 2.4 MB (320) |
| Compatibility | Universal, favoured by editors | Universal, favoured by players and the web |
| Best for | Recording, mixing, mastering | Sharing, streaming, portable listening |
Choosing the right MP3 bitrate
Because WAV is lossless, this is the one conversion where the bitrate really is your choice. Here is how to pick.
- 320 kbps: the highest MP3 setting. Use it for music you care about, masters you are sending for approval, and DJ sets. Most people cannot tell it from the WAV in a blind test.
- 256 kbps: very close to 320 in practice, with files about 20% smaller.
- 192 kbps: the default. A good balance for general listening and playlists.
- 128 kbps: fine for speech, podcasts, lectures and voice notes, where file size matters more than cymbals.
Will I lose quality converting WAV to MP3?
Some, yes. MP3 is lossy, so the encoder removes information it judges you are unlikely to hear. At 256 or 320 kbps that loss is very hard to spot on most material. At 128 kbps you may notice softer high frequencies or a slight swirl on reverb tails and cymbals.
Two tips help. Keep your original WAV as the master, and always convert from it rather than from another MP3. Every time you re-encode an MP3, a little more is lost. If a WAV has 24-bit depth, that makes no practical difference to the MP3, which has no fixed bit depth.
How this WAV to MP3 converter works
The converter runs inside your browser using WebCodecs and a LAME-based MP3 encoder compiled to WebAssembly. Your WAV is read from disk, encoded in memory and saved back to your device. It is never uploaded.
- No account, no watermark, free.
- Works offline after the page loads, handy for large sessions on a train or plane.
- Batch convert a folder of WAVs. Files run in parallel and each downloads separately.
- No fixed file size cap. Very long recordings are limited by your device's memory.
- WAV files rarely carry rich tags, and not all metadata is copied across, so add titles in your music app if you need them.
Convert WAV to MP3 on any device
On Windows or Mac, open this page in any modern browser and drop your files in. On iPhone and iPad, use Safari and pick WAVs from the Files app. On Android, Chrome works the same way. There is no app to install and nothing to configure beyond the bitrate.