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WAV to MP3 Converter

Shrink uncompressed recordings to MP3 — constant or variable bitrate, your choice.

Converters Reviews Free · no sign-up

Drop a WAV here, or click to choose one

Converted on your device — the file is never uploaded

Result

Quick Tool Overview

The WAV to MP3 Converter compresses uncompressed recordings with LAME, offering constant or variable bitrate, resampling, mono and loudness normalisation.

What it does
Compresses WAV audio to MP3
You give it
A WAV or AIFF file
You get back
An MP3 about a tenth the size
Best for
Sharing recordings that are too big to send
Converters Free, unlimited use No sign-up Runs in your browser

About the WAV to MP3 Converter

WAV files are enormous — about 10 MB a minute in CD-quality stereo — because nothing in them is compressed. That is right for recording and editing and hopeless for sending: email attachments bounce, upload sites cap the size, and a one-hour recording is well over half a gigabyte.

The conversion runs in your browser through ffmpeg.wasm — the real ffmpeg, compiled to WebAssembly. Nothing is uploaded: a wedding video, a client recording or an unreleased track never leaves your machine. The engine is a one-off download of about 32 MB, after which your browser caches it and every later conversion starts immediately.

The encoder is LAME, the same one desktop tools use. Choose a constant bitrate when the size has to be predictable, or variable bitrate for better quality at the same size — V2 sounds better than a flat 192 kb/s and usually comes out smaller. Resample, force mono, trim to a section, or apply broadcast loudness normalisation on the way through.

Key features of the WAV to MP3 Converter

LAME encoder

The same encoder desktop tools use, running in your tab.

VBR or CBR

Better quality per megabyte, or a predictable file size.

Mono for speech

Halves the size of a voice recording with no real loss.

Trim as you convert

Give a start time and a length to take just the part you need.

Nothing is uploaded

ffmpeg runs inside the browser tab, so the file never leaves your computer.

How to use the WAV to MP3 Converter

  1. 1

    Drop the WAV in

    AIFF works too, at any length.

  2. 2

    Choose constant or variable bitrate

    VBR for quality per megabyte, CBR for predictable size.

  3. 3

    Adjust the details

    Sample rate, channels, trimming, loudness.

  4. 4

    Convert and download

    A tenth of the size, near enough.

Frequently asked questions

About a tenth at 192 kb/s. A 60 MB WAV becomes roughly 6 MB, and a one-hour recording goes from 600 MB to around 80 MB.

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