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WAV to MP3Free · No upload · No install
Audio converter that stays in your browser
Convert WAV to MP3 or MP3 to WAV — up to 320 kbps, up to 25 files at a time, entirely on your device. No file ever leaves your machine.
A 3-minute stereo WAV weighs about 30 MB; the same track as a 320 kbps MP3 is roughly 7 MB — 77% smaller, with quality most ears can't tell apart.
- 100% free
- WAV ↔ MP3
- No upload
- No signup
- Up to 25 files
Drag WAV files here — they turn into MP3s on this device
.wav up to 200 MB each, 25 files per batch — nothing is uploaded
Default: WAV → MP3. Switch to MP3 → WAV for uncompressed output.
How to convert audio files online for free
Four quick steps, all on your own device — no account, no upload queue and no software to install.
Pick a conversion direction
WAV → MP3 is the default. Switch to MP3 → WAV with the link below the tool if you need uncompressed output instead.
Drop your audio files
Drag up to 25 files (200 MB each) into the drop zone, or press the pick button to browse. Conversion starts the moment a file lands.
Choose quality settings
For MP3 output, select 320 kbps for maximum quality or 128 kbps for the smallest file size. For WAV output, pick 16-bit (CD standard) or 24-bit (studio quality).
Download converted files
Each finished file shows its original and converted size. Grab files individually or press “Download all” for the whole batch.
Technical specifications
| Supported conversions | WAV → MP3, MP3 → WAV |
|---|---|
| WAV input/output | RIFF: 8/16/24/32-bit integer PCM, 32/64-bit float, A-law, µ-law |
| MP3 output bitrates | 128, 160, 192, 256 or 320 kbps (constant bitrate) |
| WAV output bit depths | 16-bit (CD), 24-bit (studio), 32-bit float (DAW masters) |
| Sample rates | 32, 44.1 and 48 kHz kept as-is; other rates resampled automatically |
| Channels | Mono and stereo preserved; surround down-mixed to stereo |
| Batch limit | 25 files per batch, 200 MB per file |
| Processing | 100% on your device — LAME encoder + decoder in Web Workers, no upload |
| Price | Free — no account, no watermark, no daily quota, no premium tier |
| Works offline | Yes, once the page has loaded |
Why a browser-based audio converter?
Most audio converters fall into two camps: desktop apps that need installation and updates, or cloud services that upload your files to a remote server. Both come with friction — the first asks you to install software you may use twice a year, the second makes you wait for an upload, trust a third party with your audio, and often hits you with file-size caps or a paywall after the first conversion.
This converter takes a third path. It runs the LAME MP3 encoder — the same encoder behind most MP3s ever made — compiled to JavaScript and executed inside a Web Worker in your browser. There is no server doing the work, so there is nothing to upload, nothing to queue, and nothing to charge for. A 200 MB WAV starts converting the instant you drop it — even on a plane with no internet.
Frequently asked questions
What audio formats does this converter support?
It converts between WAV and MP3 — the two most common audio formats. WAV to MP3 compresses uncompressed audio for sharing and storage; MP3 to WAV decodes back to uncompressed audio for editing and mastering.
Is this audio converter free?
Yes, completely free with no limits. There is no trial period, no daily cap, no watermark and no premium tier. Every feature — 320 kbps MP3 output, 25-file batches, unlimited conversions — is available at no cost.
Do my files get uploaded to a server?
No. The converter runs entirely in your browser using Web Workers. Your audio stays on your device — nothing is uploaded, which also means conversion starts instantly with no upload queue.
What MP3 bitrate should I choose?
320 kbps for maximum quality — most listeners cannot tell it apart from the original WAV. 192 kbps for a good balance of size and quality. 128 kbps when file size matters most, like email attachments or voice recordings.
Can I convert multiple audio files at once?
Yes — up to 25 files per batch, each up to 200 MB. Files convert sequentially with a live progress bar, and a single “Download all” button saves every finished file.
Does the audio converter work on mobile?
Yes. It works in any modern browser — Chrome, Safari, Firefox, Edge — on phones, tablets and desktops. No app download required.
Will converting to MP3 reduce audio quality?
MP3 is a lossy format, so some data is discarded — but at 320 kbps the difference is inaudible on virtually all playback equipment. The LAME encoder used here is the gold standard for MP3 encoding quality.
Can I convert MP3 back to WAV?
Yes. Switch to MP3 → WAV mode and drop your MP3 files. The decoder outputs uncompressed WAV at 16-bit, 24-bit or 32-bit float — ready for editing in any DAW or audio editor.
Looking for a specific direction?
WAV to MP3 — convert uncompressed WAV audio to compact MP3 at 128–320 kbps.
MP3 to WAV — decode MP3 back to uncompressed WAV at 16, 24 or 32-bit float for editing and mastering.
Your files stay on your device
Every step — reading the source file, encoding or decoding the audio, handing you the download — happens locally in a Web Worker. There is no server that could store, scan or leak your audio. The converter even keeps working if you go offline after the page loads.