WAV to MP3 Converter
Runs in your browser — your files are never uploaded.
Compress a large, uncompressed WAV file down to a small, universally playable MP3. OkConverter runs a real copy of ffmpeg compiled to WebAssembly directly in your browser, so your audio is never uploaded — the whole encode happens on your device.
OptionsBitrate: Default — best quality for size
How to convert WAV to MP3
- 1
Drop your WAV file onto the box, or click to choose one.
- 2
OkConverter loads the conversion engine (one-time per session) and encodes it locally.
- 3
Click “Download” to save the MP3.
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Frequently asked questions
How much smaller will the MP3 be?+
Typically 5–10× smaller than the source WAV, depending on the audio content — WAV stores every sample uncompressed, while MP3’s lossy compression discards detail that’s harder for human ears to notice.
What bitrate does it use?+
Variable bitrate around 190kbps (libmp3lame quality level 2) — near-transparent for most music and speech, without the unnecessarily large files a constant high bitrate would produce.
Why does the first conversion take longer?+
The tool loads a real build of ffmpeg compiled to WebAssembly (about 31 MB) the first time you use it on this page. It stays loaded for the rest of your session, so later conversions are fast.
Is my file uploaded anywhere?+
No. Once the engine has loaded, encoding happens entirely inside your browser tab.