Are files uploaded?
No. Conversion runs in your browser via WebAssembly — files never leave your device, and nothing is sent to a server.
WAV to MP3
Privacy-first audio conversion
The browser engine processes WAV files on your device and returns local MP3 downloads. Nothing is uploaded — no servers, no accounts, no tracking of your audio. Add a batch, pick a bitrate, get MP3 in seconds.
Bitrate guide
128 kbpsVoice notes, drafts, fast sharing
192 kbpsBalanced default for most audio
256 kbpsMusic with smaller file size
320 kbpsHighest MP3 bitrate available here
Get it as a Chrome extension
Prefer to keep the converter one click away? Same private WAV to MP3 tool, opened in the Chrome side panel of any tab.
How it works
1.Drop your WAV files
Drag files onto the page or click to browse. Up to 15 WAV files at a time, 200 MB each (50 MB on mobile).
2.Pick bitrate and options
Choose 128, 192, 256, or 320 kbps. Open Advanced to even out loudness, trim the start or end, or set artist, album, and year tags.
3.Convert in your browser
A WebAssembly encoder runs in a Web Worker on your device. Files stay local — nothing is uploaded, no account needed.
4.Download MP3
Save each MP3 separately, or grab the whole batch as a ZIP. Turn on "Download after conversion" to auto-save when each file is done.
Want the longer version — which bitrate to pick, how to convert a whole folder at once, and what MP3 throws away on the way? Read the step-by-step guide. To see how much smaller each bitrate makes a file, open Compress WAV.
FAQ
What is the file limit?
Up to 15 WAV files at a time, 200 MB per file, and a 500 MB total queue. Mobile browsers get smaller limits so the page stays smooth.
Which bitrate should I pick?
192 kbps is a good default for most audio. Pick 128 kbps for voice notes, or 256/320 kbps when you want maximum quality for music.
Is there a Chrome extension?
Yes — a free WAV to MP3 extension for Chrome that opens in the browser side panel. Same converter, same privacy, always one click away.
Who makes this
Built and maintained by Stanislav Mashkin, an independent developer — more about who runs this and why. The whole converter runs on your device because that is the simplest thing that works — no server means nothing to upload, nothing to store, and nothing to trust me with.
It is one of a handful of small browser tools I build on the same principle. If you deal with documents there is pdfannotation.app for marking up PDFs and csvtopdf.app for turning spreadsheets into clean tables; if you review websites for work, I also make websitefeedback.tools, a Chrome extension that pins comments straight onto a live page.
Contact us
Have a partnership idea, a feature request, or a bug to report? Drop a message — we read every one. Leave an email if you'd like a reply.