Skip to content
WAV to MP3

Free online audio converter

WAV to MP3, right in your browser

WAV to MP3 is a free online converter that turns WAV audio into MP3 at 128–320 kbps directly in your browser. Files never leave your device — no upload, no signup — and you can convert up to 25 files of 200 MB each per batch.

A 3-minute stereo WAV weighs about 30 MB; the same track as a 320 kbps MP3 is roughly 7 MB — 77% smaller, with quality most ears can't tell apart.

  • Free forever
  • No upload
  • No account
  • Up to 25 files
  • 320 kbps MP3

Drag WAV files here — they turn into MP3s on this device

.wav up to 200 MB each, 25 files per batch — nothing is uploaded

How to convert WAV to MP3

Three steps, all on your own device — no account and no upload queue.

  1. Add WAV files

    Drag up to 25 .wav files (200 MB each) into the drop zone, or press “Pick WAV files” to browse your device. Conversion starts by itself the moment a file lands.

  2. Set the MP3 bitrate

    The default 320 kbps keeps the most detail from your lossless WAV. Drop to 192 kbps for a smaller everyday file, or 128 kbps when size matters more than fidelity — you can re-convert at a new bitrate without re-adding files.

  3. Download your MP3s

    Each file shows its result the moment it finishes — original size, MP3 size and how much smaller it got. Save tracks one by one or hit “Download all” for the whole batch.

Technical specifications

Input formatWAV (RIFF): 8/16/24/32-bit integer PCM, 32/64-bit float, A-law, µ-law
Output formatMP3, constant bitrate — 128, 160, 192, 256 or 320 kbps
Sample rates32, 44.1 and 48 kHz kept as-is; other rates resampled automatically
ChannelsMono and stereo preserved; surround down-mixed to stereo
Batch limit25 files per batch, 200 MB per file
Processing location100% on your device — LAME encoder in a Web Worker, no upload
PriceFree — no account, no watermark, no daily quota
Works offlineYes, once the page has loaded

Frequently asked questions

How do I convert WAV to MP3 without installing software?

Drop the WAV file on this page and download the MP3 — that is the whole process. The converter runs on the LAME MP3 encoder compiled to JavaScript, so everything happens inside the browser tab: no app to install, no account to create, and nothing sent to a server.

Is this WAV to MP3 converter really free?

Yes, completely. There is no trial period, no daily quota, no watermark and no premium tier — every feature, including 320 kbps output and 25-file batches, is free.

Do my WAV files get uploaded anywhere?

No. Decoding and MP3 encoding both run on your own device inside a Web Worker. Your recordings never touch a server, which also means a 200 MB session file converts without any upload wait.

How much smaller will my file be after converting?

Between 77% and 91% smaller, depending on the bitrate you pick. A 3-minute stereo WAV is about 30 MB; as MP3 it becomes roughly 7 MB at 320 kbps, 4.3 MB at 192 kbps, or 2.9 MB at 128 kbps.

Does converting WAV to MP3 lose audio quality?

Technically yes — MP3 is a lossy format — but at 320 kbps the difference from the WAV original is inaudible to most listeners on most equipment. Keep the WAV as your master copy and use the MP3 for sharing, uploading and everyday listening.

Which MP3 bitrate should I choose?

Use 320 kbps when quality is the priority — it is the highest the MP3 format allows. 192 kbps is the sweet spot for podcasts and voice notes, and 128 kbps produces the smallest files for email attachments or slow connections.

Can I convert multiple WAV files to MP3 at once?

Yes — up to 25 files per batch, 200 MB each. Files convert one after another with a live progress bar, and a single “Download all” button saves every finished MP3.

What kinds of WAV files does it accept?

All common variants: 8-, 16-, 24- and 32-bit integer PCM, 32- and 64-bit float, mono and stereo, plus A-law and µ-law WAVs through the browser decoder. Surround recordings are down-mixed to stereo, and hi-res rates like 96 kHz are resampled to 48 kHz automatically.

About this converter

WAV is the format of raw, uncompressed audio — studio exports, field recordings, voice-over sessions, sound effects. That purity is exactly why the files are huge: every minute of stereo CD-quality WAV takes about 10 MB. WAV to MP3 exists for the moment you need that audio to travel — into an email, a messenger, a podcast host, a phone with limited storage.

The converter reads the RIFF structure of your WAV directly, feeds the raw PCM samples to the LAME MP3 encoder — the same encoder behind most MP3s ever made, compiled to JavaScript — and streams the result back as a download. All of it runs in a background Web Worker on your own machine, so the page stays responsive and a long session file converts as fast as your CPU allows, not as fast as your connection uploads.

Nothing about your audio is collected: no files, no filenames, no waveforms. Close the tab and every trace of the session is gone.

Your recordings stay on your device

Every step — reading the WAV, encoding the MP3, handing you the download — happens locally. There is no server that could store, scan or leak your audio, and the converter keeps working if you go offline after the page loads.