Queue the files
Drop as many WAVs as you need. They are processed one at a time, so memory use stays bounded even when the folder is large.
Browser tool · nothing uploaded
Convert a folder of WAV files to MP3.
Drop several WAVs, pick a bitrate or a target file size, and let the queue run. Everything is encoded on this device; the files are never uploaded.
.wav → .mp3Batch queueTarget sizeNo upload
batch converter local
ready nothing uploaded
Output settings
Optional. The bitrate is calculated from the duration; it cannot exceed 320 kbps.
Converting… 0%
The MP3s were written in this tab. The WAVs were not uploaded.
01
What this converter does
convertwavtomp3.com converts WAV files to MP3 in batches, in the browser; files are never uploaded.
The WAV file is read from your disk, its audio track is decoded, and the samples are re-encoded as MP3. The output is written in this tab and offered as a download. There is no upload endpoint, no account and no queue.
If you need the reverse direction, or a different source format, this page is deliberately single-purpose. The how-it-works page explains the engine, the browser requirements and the cases where the converter will refuse a file rather than write a broken one.
02
How it works
Pick a bitrate or a target
A target size in MB is converted into a CBR bitrate from each file's duration. If the target is too small for the duration, the page says so instead of pretending.
Download each file or a ZIP
Individual downloads stay available. A ZIP is offered when the total output is under 500 MB, because a larger ZIP would have to sit in memory.
03
What changes in the file
| Property | Result | Notes |
|---|---|---|
| Queue | Sequential | One file at a time keeps memory bounded. |
| Target size | Computed CBR bitrate | From duration; clamped to the MP3 range. |
| Bitrate | 64–320 kbps CBR | CBR is predictable; VBR is not offered. |
| ZIP | Under 500 MB total | Larger batches download individually. |
| Naming | Source base name + .mp3 | Duplicates are numbered in the ZIP. |
| Metadata | Basic tags may carry | Not guaranteed across players. |
Target size is an estimate
Container overhead and encoder padding move the final byte count by a small amount. The page shows the estimate before conversion, not a guarantee after it.
04
Guides for this format
Guide
Batch convert WAV to MP3
How the browser queue handles a folder of WAVs, how names and ZIPs work, and the point where a desktop tool is the better choice.
GuideConvert WAV to MP3 on a Mac
Browser, Music app, Audacity and Terminal ffmpeg. What each one does with a WAV, which one writes MP3, and how to avoid an unnecessary upload.
GuideTarget size MP3
The bitrate math behind a target file size, worked examples for podcasts and music, and the cases where the target is impossible.
05
Questions
Can I convert a whole folder?
Drop the files or select several in the picker. The queue processes them sequentially. A browser folder picker is not used because support is uneven and it can sweep in files you did not mean to convert.
How does target size work?
It is bitrate math: target bytes × 8 ÷ duration. The result is clamped to the MP3 range. If the target is too small for the duration, the lowest rate still produces a larger file, and the page tells you before you start.
Is there a batch limit?
No upload limit. The practical limit is memory and how long you want to wait. The queue is sequential and each finished file is released to a download.
Does it use Audacity?
No. Audacity is a desktop editor with a batch macro system. This is a browser converter for the common case: a folder of WAVs that need to become MP3s. The guide explains when Audacity is the better tool.
Are my files uploaded?
No. The WAVs are read from disk and processed in this tab. There is no upload endpoint.
Can I keep the file names?
Yes. Each output keeps the source base name and changes the extension to .mp3. Duplicate names in the ZIP are numbered instead of overwritten.
06
Limits, stated up front
- No upload limit, but a memory limit. The file is read lazily from disk; the output still has to fit in the tab. Very large files can exhaust a phone or a low-memory laptop.
- MP3 is lossy. The converter never claims otherwise. It re-encodes the audio; choose a bitrate at or above the source to avoid stacking more loss than necessary.
- Not every codec is supported. The browser must be able to decode the audio track. ALAC, AC-3, DTS, WMA, AMR and DRM-protected files are rejected with a clear message.
- No URL input. The file must be on your device. The tool does not fetch from streaming services or bypass DRM.
The full support matrix and browser requirements are on how it works. Privacy details are on privacy.