Drop your WAV file. We'll convert it to MP3 right here in your browser, your file never leaves your device.
Drop your file here
or click to pick from your device
How it works
Click the dropzone above or drag a WAV from your desktop. Files of any size, there's no upload, so there's no upload limit.
The conversion runs entirely in this tab using JavaScript and WebAssembly. Your file never touches our servers, we don't have any.
Get your MP3 the moment the conversion finishes. Convert another, or close the tab.
Your file is never uploaded. The entire conversion runs in your browser using WebAssembly. We can't see what you convert because we have no server to see it.
Server converters cap free users at 1-2 GB and gate larger files behind a paid plan. Since nothing uploads, our limit is whatever your browser can handle.
No account required. No watermark on the output. No queue. Open source, every line of conversion code is public.
Formats involved
WAV is uncompressed audio, every sample stored as raw PCM data. Developed by IBM and Microsoft in 1991 as the standard for Windows audio. Files are 10× larger than MP3 but bit-perfect, which is why audio engineers and music producers work in WAV during editing and switch to MP3/AAC only for final delivery.
How to open
Universal compatibility, every audio player, DAW (Logic, Pro Tools, Ableton, FL Studio, Reaper), and editing tool reads WAV.
MP3 is the most widely-supported audio format ever, every device, app, and music player on the planet reads it. It uses lossy compression (typically removing audio frequencies humans can't hear well) to shrink files to about a tenth of their uncompressed size. At 192 kbps and above, the difference vs lossless is inaudible to most listeners on most equipment.
How to open
Every audio player ever made. iOS Music, Android, VLC, iTunes, Windows Media Player, browsers, smart speakers, universal.
Related tools
How we compare
| Feature | Ustwineconvert | CloudConvert | iLovePDF | FreeConvert | Smallpdf |
|---|---|---|---|---|---|
| Files uploaded to a server | |||||
| Free file size limit | No limit | 1 GB | 200 MB | 1 GB | 5 GB |
| Free conversions per day | Unlimited | 10/day | Limited | Limited | 2/day |
| Signup required | |||||
| Watermark on output | |||||
| Open source | |||||
| Works offline (after first load) |
Last verified May 2026 from each competitor's pricing and FAQ pages. Limits and pricing change frequently.
FAQ
Yes. No signup, no watermark, no daily file count limit. The entire engine is open source, you can read the conversion code on GitHub.
Nowhere. The conversion runs entirely in your browser using JavaScript and WebAssembly. Your file is never uploaded to our servers. We don't have any servers handling files, there's nothing for us to log, store, or accidentally leak.
Whatever your browser can hold in memory. Practically, this means a few hundred MB on most computers, significantly larger than the 1-2 GB caps that server-upload converters charge for. Very large files (multi-GB) may require closing other browser tabs first.
Audio editing, mastering, archival. Anywhere you need bit-perfect sound. Music files, podcasts, audiobooks, voice recordings. The most common reason to convert is compatibility, MP3 works in places where WAV doesn't, or vice versa.
Universal compatibility, every audio player, DAW (Logic, Pro Tools, Ableton, FL Studio, Reaper), and editing tool reads WAV.
Once the page is loaded, the conversion itself runs entirely offline. The first time you use a tool, your browser downloads the conversion library (a one-time cache). If you reload while offline, the page won't load, but you can install the site as a Progressive Web App for full offline use.
Single file at a time for now. Batch conversion is on the roadmap, for now, drop one file, download the result, then convert the next.