WAV to MP3 Converter
Compress WAV audio into small, universally playable MP3 files. Drop a whole batch at once, pick your bitrate, and download each result. Free, no sign-up, everything in your browser.
Powered by ffmpeg.wasm (WebAssembly). No upload, no account, no watermark.
How the WAV to MP3 converter works
WAV files store raw, uncompressed PCM audio: about 10MB per minute of stereo. That fidelity is useful for editing, but wasteful for sharing, emailing or loading onto a phone. This converter encodes your WAV files to MP3 with libmp3lame, the reference MP3 encoder, shrinking them by roughly 10x at the default 192k bitrate while keeping them playable on every device made in the last two decades.
Batch conversion is built in: drop a whole folder of WAV files and they are processed one after another, each with its own progress bar and download button. Up to 20 files per batch keeps memory use predictable.
Everything runs locally in your browser with ffmpeg.wasm, a WebAssembly build of FFmpeg. The engine (about 32MB) downloads once and is then cached. Your recordings are never uploaded to any server, so the tool is safe for voice memos, studio masters and interviews alike.
Tips for best results
| Situation | What to do |
|---|---|
| Music or studio recording | Use 256k or 320k for the highest quality MP3 |
| Voice memo, interview or lecture | 128k is plenty and produces the smallest file |
| Many files at once | Drop them together; each converts in turn and gets its own download button, or use Download all |
| Archival or further editing | Keep the original WAV; MP3 is a delivery format, not an editing format |
Frequently asked questions
Is WAV to MP3 conversion lossless?
No. WAV is uncompressed and MP3 is always lossy: the encoder discards audio detail that is hard to hear. At 256k or 320k the result is transparent for most listeners, but for archiving or further editing you should keep the original WAV.
How much smaller will my files get?
A stereo WAV takes about 10MB per minute (1411 kbps). At the default 192k MP3 bitrate that drops to roughly 1.4MB per minute, about a 7x saving, and at 128k about a 10x saving.
Can I convert several WAV files at once?
Yes. Drop or select up to 20 WAV files and they are converted one after another. Each finished file gets its own download button, and a Download all button fetches the whole batch.
Is there a file size limit?
There is no hard limit per file, but files are processed in browser memory, so individual files above about 2GB will not fit. Typical WAV recordings convert in seconds.
Does my audio get uploaded anywhere?
No. The converter runs entirely in your browser with ffmpeg.wasm. After the one-time engine download you can go offline and it will still work. Your files never leave your device.