WAV to MP3 Converter

Convert WAV to MP3 without uploading your files

WAV stores audio as uncompressed PCM samples - every sample exactly as captured, with no quality loss and no decoding cost. MP3 is a lossy format that discards sound the human ear is unlikely to notice, shrinking the file by roughly an order of magnitude. Converting WAV to MP3 is therefore a deliberate trade: you accept a small, usually inaudible quality reduction in exchange for a file that actually fits in an email, a podcast feed, or a phone.

The arithmetic is easy to predict. Uncompressed audio costs sample rate × bit depth × channels bits per second, so CD-quality stereo (44,100 Hz × 16 bit × 2) runs at about 1,411 kbps - roughly 10.6 MB per minute. A three-minute song is therefore around 30 MB as WAV, but only 4–5 MB at 192 kbps MP3.

Choosing a bitrate

Four presets cover nearly every real use:

• 128 kbps - speech, interviews, voice memos, and audiobooks. Roughly 1 MB per minute; artifacts are inaudible on voice.
• 192 kbps - the default here, and the sweet spot for music on laptop speakers, earbuds, or in a car.
• 256 kbps - high quality for music you will listen to closely, or audio that may be re-encoded later.
• 320 kbps - the MP3 ceiling. Most listeners cannot distinguish it from the source in a blind test, but it leaves the most headroom.

One rule worth internalizing: lossy compression is not reversible. Converting an MP3 back to WAV inflates the file size but restores nothing - the discarded frequencies are gone permanently. Always keep the original WAV as your master, and encode to MP3 only for distribution. For the same reason, avoid re-encoding an MP3 that was already compressed at a low bitrate; the losses compound audibly.

Under the hood the tool decodes your file with the browser's Web Audio API and re-encodes it through a JavaScript build of the LAME encoder, the same engine behind most desktop MP3 tools. Mono and stereo are both handled, and the sample rate of the source is preserved. Because encoding is CPU work done on your own machine, a long file takes a few moments and a faster computer finishes sooner.

Nothing is uploaded at any point - the file is read straight from your disk into the page and never touches a network. That makes it safe for unreleased tracks, client recordings, confidential interviews, and anything else you would not want sitting on someone else's server.