Convert WAV to MP3 Online — Free & Adjustable Bitrate

Compress WAV files to MP3 with selectable bitrate — 128, 192, 256, or 320 kbps.

How It Works

  1. 1Upload your file by dragging it into the drop zone or clicking to browse.
  2. 2Adjust the quality slider to balance file size and visual fidelity (optional).
  3. 3Click Download to save your converted file.

About WAV to MP3

WAV files are uncompressed and can be very large — a 3-minute song at CD quality is roughly 30 MB. Converting to MP3 can reduce the file size by 80-90% while retaining good listening quality. This tool uses the lamejs MP3 encoder running entirely in your browser via JavaScript. Choose your preferred bitrate: 128 kbps for small files, 192 kbps for a good balance, 256–320 kbps for near-transparent quality. Your audio never leaves your device.

Frequently Asked Questions

What bitrate should I choose?

128 kbps is fine for speech and podcasts. 192 kbps is a good balance for music. 256-320 kbps is nearly indistinguishable from the original for most listeners.

Is my file uploaded to a server?

No. Transmute processes everything locally in your browser using JavaScript and the Canvas API. Your files never leave your device — there is no server, no upload, no cloud processing.

How much smaller will the MP3 be?

Typically 80-90% smaller. A 30 MB WAV file at 192 kbps becomes about 4 MB as MP3.

Is there any quality loss?

Yes, MP3 is a lossy format — it discards audio data that's less perceptible to human hearing. At 192 kbps or higher, the difference is very hard to notice for most listeners.

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