WAV to MP3 Converter
Convert WAV, FLAC, M4A and OGG files to MP3 in your browser with chosen bitrate, no upload.
- Runs in your browser, files never leave your device
- Free, open source, no account, no ads
- Works offline after the first visit
Convert audio files to MP3
Drop audio files here or choose files
WAV, FLAC, M4A, OGG, AAC or MP3, as many as you like. Nothing is uploaded.
No files yet. Your audio is decoded and encoded right here in this tab, so it never leaves your device.
How it works
- Add your audio. Drop WAV, FLAC, M4A, OGG, AAC or MP3 files, or pick them. Your browser decodes them; formats it cannot read are flagged on their row.
- Pick quality and convert. Choose a bitrate, channels and sample rate, then press Convert. Files are encoded to MP3 one at a time in a background worker.
- Download. Save each MP3 on its own, or every file at once as a ZIP. Sizes and savings are shown for each file.
Questions, answered
Are my files uploaded anywhere?
No. WAV to MP3 Converter runs entirely in your browser. Your audio is read into memory on your device, decoded by the browser, encoded to MP3 with JavaScript, and never sent to a server. You can disconnect from the internet and it keeps working.
Which bitrate should I choose?
192 kbps is a good default for music. 320 kbps is the highest MP3 quality and makes larger files. For speech, podcasts or phone recordings, 64 or 96 kbps with mono is usually plenty and much smaller.
Why does a FLAC or M4A file show a codec message?
Decoding is done by your browser, and not every browser can read every format. Chrome, Edge and Firefox read FLAC and OGG; Safari reads M4A and AAC well. If a row says the format is not supported, try the same file in another browser.
Is it really free? Is there a size limit?
Yes, it is free and open source under the MIT license, with no account, no daily limits and no ads. Each file can be up to about 500 MB, because decoding expands audio in memory. If it saves you a paid subscription, you can say thanks on Ko-fi.
Does it work offline?
Yes. After your first visit the page is cached by a service worker, so it loads without a connection. You can also install it from your browser's menu as an app.
Was this written by AI?
Yes. WAV to MP3 Converter was generated by Claude Code from a written specification inside an automated pipeline, with a test suite that runs in a real browser. The full source is on GitHub, so you can read every line before you trust it with your files.
Built by one person, given away for free
WAV to MP3 Converter is a free alternative to paid tools like CloudConvert WAV to MP3. If it earns a place in your bookmarks, a coffee keeps the updates coming.
☕ Support Or on Ko-fi