WAV to MP3
Convert WAV to MP3 online for free — shrink large WAV recordings by around 90% while keeping great sound, at 96 to 320 kbps. Trim the start and end, add fades and normalise the volume. Runs entirely in your browser, so your audio is never uploaded.
100% private — everything runs in your browser. Conversion happens on your device; nothing is uploaded.
Your browser decodes the audio and an open-source MP3 encoder (LAME, via lamejs) converts it on your device — nothing is uploaded. Works with MP4, MOV, M4A, WebM, MKV, WAV, OGG and more; very long files need plenty of memory, so trim if your browser struggles.
How to convert WAV to MP3
- Drop your WAV file in the box.
- Choose the MP3 quality and stereo or mono.
- Optionally trim, fade or normalise.
- Click Convert to MP3, preview it and download.
What you can use it for
- Shrink voice memos and studio bounces for sharing
- Make MP3s of recordings for email and messaging apps
- Prepare podcast audio for upload
- Save space on phones and audio players
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How much smaller is MP3 than WAV?
A CD-quality WAV uses about 10 MB per minute; a 192 kbps MP3 uses about 1.4 MB — roughly 85–90% smaller.
Will I lose quality?
MP3 is lossy, but at 192–320 kbps most listeners can't tell the difference from the WAV. Keep your WAV as the master copy for editing.
Which quality should I choose?
192 kbps sounds excellent for music and keeps files small; 320 kbps is the highest MP3 quality. For podcasts and speech, 96–128 kbps in mono is plenty.
Can I convert just part of the file?
Yes — set a start and end time (minutes:seconds) before converting. Fade in and out smooths the cut edges.
Is there a file size limit?
There's no upload limit because nothing is uploaded, but the whole file is decoded in your browser's memory. Files up to a few hundred MB work well on most computers; for very long recordings, convert in parts.
Is my file uploaded?
No. Decoding and MP3 encoding both happen on your device.