About WAV to MP3

The tool takes uncompressed WAV audio — studio bounces, voice memos, interview recordings, sample packs — and encodes it as MP3 at a bitrate you choose, from 128 up to 320 kbps. Batches of up to 25 files run one after another with live progress, and every finished track reports its exact size saving. A typical result: a 30 MB three-minute WAV becomes a 7 MB MP3 at the default 320 kbps.

Input handling is deliberately forgiving. Integer PCM at 8, 16, 24 or 32 bits and floating-point WAVs are decoded sample-by-sample; A-law, µ-law and other in-container codecs go through the browser's own audio decoder; surround channels fold down to stereo; and sample rates the MP3 format cannot carry, like 96 kHz, are resampled before encoding.

The conversion pipeline has three stages, all inside your browser tab:

1. Parse. A small RIFF parser walks the WAV's chunk structure to find the format description and the raw sample data — cheap enough to run before the heavy lifting starts.
2. Decode. For plain PCM files the sample data is read directly, frame by frame, without ever expanding the whole file into memory. Exotic variants fall back to decodeAudioData, the same decoder your browser uses to play audio, which also handles resampling and surround down-mixing.
3. Encode. The samples are fed to LAME — the reference open-source MP3 encoder, compiled to JavaScript — running in a background Web Worker so the page never freezes. The finished MP3 is handed back as a normal download.

Because the encoder runs on your CPU instead of a shared server, conversion speed scales with your hardware and is completely independent of your internet connection.

Nothing is uploaded — not the recording, not its name, not its duration. All three pipeline stages above run locally, so there is no server-side copy to secure, retain or delete in the first place. That is what makes the privacy promise structural: the architecture has no place where your audio could be stored.

The converter holds your files only in the tab's memory while it works. Removing a file from the list, clearing the batch or closing the tab releases them; nothing is written to disk or to any browser storage, so no trace of a session survives it. You can even cut your network connection after the page loads and keep converting.

This covers what WAV to MP3 itself does. It cannot speak for browser extensions, corporate proxies or the operating system — only that this site's own code never moves your audio anywhere.