How do I convert WAV to MP3?

WAV files store raw, uncompressed PCM audio. A stereo 16-bit/44.1 kHz WAV runs at a fixed 1,411 kbps — roughly 10 MB per minute — which is ideal in the studio but impractical for sharing, podcast feeds, or portable players. Converting to MP3 applies perceptual coding: the encoder analyses the signal and discards components the human ear is least likely to notice, shrinking a 320 kbps MP3 to about a quarter of the WAV size and a 128 kbps MP3 to under a tenth.

Because WAV is lossless, it is the ideal starting point for an MP3 encode. You get exactly one generation of lossy compression, with no inherited artefacts from a previous codec. The encoder used here is LAME (via ffmpeg's libmp3lame), widely regarded as the highest-quality MP3 encoder available; at 320 kbps constant bitrate or V0 variable bitrate the result is transparent to almost all listeners on almost all playback systems.

Bitrate is the main decision. 320 kbps is the MP3 ceiling and the safe choice for music you care about. 192 kbps is a sensible balance for casual listening, and 128 kbps suits voice recordings, lectures, and podcasts where small files matter more than sonic detail. If you are unsure how bitrate maps to audible quality, see our practical guide to audio bitrate.

Reasons to convert WAV to MP3 usually come down to compatibility, file-size, or specific feature requirements. Common situations:

• An app or platform only accepts MP3 uploads.
• You need a feature unique to MP3 (e.g. lossless editing, chapter markers, smaller streaming size, etc.) that WAV doesn't provide.
• You're optimising file size — modern formats often produce smaller files than the older format you started with.
• You need a single archival format across a project so files behave consistently in the same viewer.

1. Open the WAV → MP3 tool on mp3.now.
2. Drag your WAV file onto the drop zone, or click Select files. You can drop a whole folder of files at once.
3. The output is fixed to MP3. If the format supports extra options (bitrate, sample rate, channels, volume normalization), tweak them in the options panel.
4. Click Convert. The job runs on our server and finishes in a few seconds for typical tracks.
5. Download the result. Files stay in storage for 24 hours and are then permanently deleted.

The entire flow is free for the first 10 jobs per day with no signup required. A free account doubles that quota; a premium plan removes the limit entirely.

• Choose 320 kbps for music masters and 128 kbps for speech — voice content stays perfectly intelligible at low bitrates while music loses air and detail.
• Never convert WAV to MP3 and then back again expecting to restore quality; the data discarded by the MP3 encode is gone permanently.
• If your WAV is 24-bit, converting to MP3 handles the bit-depth reduction automatically — no need to dither or convert to 16-bit first.
• For mono voice recordings, select mono output: at the same bitrate all bits go to one channel, effectively doubling the quality per channel.
• Batch-convert an album from a single session so every track gets identical bitrate and sample-rate settings.