WAV to MP3
Compress a WAV to MP3 at the bitrate you choose, in your browser.
Select an audio file
Your WAV is encoded to MP3 at the bitrate you pick — entirely in your browser.
Click to choose, or drop a file here
About converting WAV to MP3
WAV files are uncompressed, which makes them large — often 100 MB for a few minutes. Converting to MP3 typically shrinks that 8–12× with little audible difference at a sensible bitrate, which is why MP3 is what you send by email, upload to a form, or put on a website.
The conversion happens in your browser. The WAV is decoded to PCM samples with the Web Audio API, then a JavaScript port of the LAME encoder (loaded only when you run the tool) writes the MP3 at the bitrate you choose — 128 kbps for voice, 192 for a good default, 256–320 for music you care about. Nothing is uploaded.
MP3 is lossy, so some data is discarded permanently; keep the original WAV if you'll edit further. The encoder handles mono and stereo, and the file is processed in memory, so extremely long recordings are limited by your device rather than by us.
Supported files
Accepts a WAV file. Produces an MP3 at 128, 192, 256 or 320 kbps.
Is my file uploaded?
No. The WAV is decoded and the MP3 encoded entirely in your browser with an in-browser LAME port. Nothing is sent to a server.
Common problems
- The MP3 sounds thin compared to the WAV
- Raise the bitrate to 256 or 320 kbps before converting.
- A very long file is slow
- MP3 encoding in the browser is CPU-bound. It still completes, but a long recording takes a bit — leave the tab open.
How to WAV to MP3
- 1
Add the WAV
Drop in your WAV file — nothing is uploaded.
- 2
Choose a bitrate
Pick 128–320 kbps depending on the size/quality trade-off you want.
- 3
Download the MP3
Save the compressed MP3.
Related PDF tools
WAV to MP3 — frequently asked questions
Which bitrate should I pick?+
192 kbps is a good default. Use 256–320 for music you care about, 128 for voice or when size matters most.
Is my file uploaded?+
No. The WAV is decoded and the MP3 encoded in your browser with a JavaScript port of the LAME encoder.
How much smaller will it be?+
Usually 8–12× smaller than the WAV, depending on the bitrate you choose.
Is any quality lost?+
MP3 is lossy, so yes — but at 192 kbps and above it's hard to hear on most material.
Do you upload my files to a server?+
No — every tool here processes your files entirely on your device, and nothing is uploaded to a server. The only exception is the AI tools, which send the extracted text (not the file) to Claude to do their work.
Is there a file size limit?+
There's no artificial limit we impose, but since processing happens in your browser, very large files (500+ MB or 1,000+ pages) are limited by your device's memory rather than by us.
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