WAV to MP3 Converter

What is inside a WAV file

WAV is the RIFF-based audio format Microsoft and IBM introduced in 1991. In practice it is a short header followed by raw PCM samples — no compression at all. CD-quality stereo, 16-bit at 44.1 kHz, is 1,411 kbps, or about 10 MB for every minute of sound. Recorders and studio software often use 24-bit at 48 kHz, which is about 60% larger again — 17 MB a minute.

Because nothing has been thrown away, a WAV is the best possible starting point for an MP3. The encoder sees exactly what was recorded, and every bit it spends goes on the sound rather than on reproducing an earlier codec's artefacts.

Why convert WAV to MP3?

WAV files usually arrive as one of three things: an export from Audacity, GarageBand, Reaper or another audio editor; a handheld or field recorder, which records WAV so nothing is lost in the moment; or an older CD rip or a sound effect library.

A ten-minute WAV is around 100 MB; as a 192 kbps MP3 it is under 15 MB, small enough to email or upload.

Many portals, learning platforms and podcast hosts accept MP3 but cap uploads in a way a WAV will blow through.

Phones, car stereos and smart speakers handle MP3 everywhere; WAV metadata and large files trip up some of them.

What happens to the sound

This is the first lossy step in the recording's life, so the result is as good as MP3 gets. At 192 kbps a music WAV becomes an MP3 most listeners cannot tell apart from the original in normal listening; 320 kbps leaves even critical listeners very little to find.

Keep the WAV. It is the master: you can make another MP3 from it at a different bitrate any time, but you can never turn the MP3 back into the WAV — the discarded detail does not come back.

For scale: WAV runs at about 10 MB per minute at CD quality. An MP3 takes 0.96 MB per minute at 128 kbps, 1.44 MB at 192 kbps and 2.4 MB at 320 kbps — bitrate alone decides it, whatever the source was.

Settings that suit a WAV source

Voice memos and interviews: 96 kbps mono. A 24-bit 48 kHz stereo recorder file is about 17 MB a minute; as 96 kbps mono it is 0.7 MB — a reduction of more than 95%.

Music: 256 or 320 kbps stereo. If the WAV is 48 kHz or 96 kHz and is going to a music library, set the sample rate to 44.1 kHz; MP3 cannot store more than 48 kHz anyway, and 44.1 kHz is what music players expect.

WAV files rarely carry tags, so the MP3 usually starts without title or artist. Any LIST/INFO tags present are copied across where ffmpeg recognises them.

Problems you may run into with WAV

The WAV will not open in the browser preview — some recorders write WAV variants (32-bit float, ADPCM, extensible headers) that browsers will not play. ffmpeg still reads them, so the conversion works even when the duration shows blank.

A very long recording fails — WAV's 32-bit size fields cap a file at 4 GB, and the whole file has to fit in the tab's memory. Split recordings of several hours in an editor first.

The MP3 sounds quieter on one side — the WAV was probably recorded with one microphone on one channel. Choose Mono in the Channels box to mix both sides to the centre.

Your WAV stays on your device

Recordings are often the most private files people own — interviews, voice notes, meetings — and the usual online converter starts by uploading them.

This converter brings the conversion to the file instead. ffmpeg, compiled to WebAssembly, runs in the tab; the WAV is read locally and the MP3 is produced on your device.

The one network cost is the engine itself, about 32 MB, downloaded once the first time you convert and reused for the rest of the session. After that you can disconnect and convert offline.