Convert audio to WAV or WebM
Decode almost any audio file your browser can play and re-encode it as a lossless WAV or a smaller WebM (Opus) file.
Read locally, nothing is uploaded.
Lossless WAV or smaller WebM (Opus), an optional sample rate change, and mono/stereo conversion.
Re-encoded entirely in your browser, no server round trip.
Frequently asked
Is my audio uploaded anywhere?
No. It's decoded and re-encoded entirely in your browser.
Why not MP3?
A WAV encoder needs no license (it's just raw PCM audio with a small header); a good MP3 encoder library for the browser is LGPL-licensed, which isn't a risk this tool takes on. WebM (Opus) covers the "I need it smaller" case instead, and plays natively in every modern browser.
What formats can I convert from?
Whatever your browser can decode: MP3, WAV, OGG, and M4A all work in most browsers.
Why would I change the sample rate?
Lower rates (like 16,000 Hz for voice) make for a smaller file when you don't need full audio fidelity - a phone-call-quality recording doesn't need 44,100 Hz. Higher rates than your source won't add any real detail back in, just file size.