Convert WAV to MP3 Free & Private

A typical WAV file at 44.1kHz stereo is uncompressed PCM, meaning a 3-minute song takes about 30MB. The same song as a 128kbps MP3 is around 2.8MB — roughly 90% smaller. At 320kbps (max quality) it's still 7MB, a 75% reduction.

MP3 is a lossy format, so yes — some audio data is discarded during encoding. However, at 128kbps or higher, most people cannot tell the difference in a listening test. For archival purposes, keep your original WAV. For sharing, streaming, or everyday listening, 128–192kbps MP3 is indistinguishable to most ears.

No. All conversion happens entirely in your browser using the Web Audio API and the open-source lamejs encoder. Your files never leave your device — no server ever sees them.

128 kbps is the standard for general listening. Use 64–96 kbps for voice recordings or podcasts where file size matters more. Use 192–320 kbps if you're an audiophile or need near-lossless quality for music production. 128 kbps is the sweet spot for most uses.

Up to 150MB per file. Large WAV files (like multi-hour recordings) can require significant browser memory during conversion. For files over 500MB or batch conversions of thousands of files, the MediaOptim desktop app handles them faster with lower memory usage.