Audio tool
Convert WAV to MP3
WAV files are uncompressed, which is why a ten-minute recording can be a hundred megabytes. MP3 gets that down to about a tenth with no audible difference at a sensible bitrate.
- 100% free
- No signup
- Batch convert
Drop your WAV files here
or click to browse from your device
Supports WAV · Max 200 MB per file · Up to 100 files
You can also paste a copied image with Ctrl+V / ⌘V
Conversion settings
MP3 is lossy, so this is a size-versus-quality trade. 192 kbps is transparent to most listeners on most material.
- Secure & privateYour files are never shared
- Lightning fastMost images in under a second
- High qualitymozjpeg and libvips under the hood
- Works everywhereAny device, any browser
Input, output and limits
Every figure below is read from the same configuration the server enforces, so this page cannot promise a limit the system will refuse.
- Input formats
- WAV
- Output format
- MP3What is MP3?
- Maximum file size
- 200 MB per file
- Maximum duration
- 60 minutes
- Batch processing
- Yes — several files at once, downloaded as one ZIP
- Price
- Free, with no account and no watermark
- Processing
- On our own server, then deleted automatically
- Engine
- FFmpeg
- File retention
- Upload and result both deleted after 24 hours
Output quality
The WAV is decoded — losslessly, since that is all a WAV is — and encoded once with LAME at your chosen bitrate. Because the source is lossless, this is a single generation of loss rather than the compounding you get when converting one lossy format to another, which makes WAV to MP3 the best-case scenario for MP3 quality. Sample rate and channel layout are preserved; length is frame-accurate. The trade is stated plainly: at 192 kbps you are keeping roughly one seventh of the data and relying on the encoder to discard the parts you were least likely to hear. That works remarkably well on music and speech, and less well on material with a lot of sharp transients such as solo percussion or applause, where 256 or 320 kbps is worth the extra megabytes.
See what this tool actually did to real files — median size change, speed and sample size, published whichever way the numbers fall.
Common use cases
Recordings from a field recorder or DAW
WAV is the capture format; MP3 is what you send to anyone else.
Emailing a rough mix
A 100 MB WAV will not go through most mail servers; a 10 MB MP3 will.
Lectures and meetings
Long speech recordings shrink dramatically at 128 kbps with no practical loss.
Freeing up space
A folder of WAVs converts in one batch.
Settings you can change
Quality
320 kbps — highest, biggest file · 256 kbps — very good · 192 kbps — the usual choice · 128 kbps — small, fine for speech · 96 kbps — voice notes only
MP3 is lossy, so this is a size-versus-quality trade. 192 kbps is transparent to most listeners on most material.
Troubleshooting
- The MP3 is still large
- Lower the bitrate. One hour at 320 kbps is about 140 MB; at 128 kbps about 55 MB.
- My WAV is over 200 MB
- That is about 20 minutes of stereo CD-quality audio. Split it first, or convert it locally with a desktop tool.
- The file is refused as having no audio
- Some WAV files carry unusual codecs rather than plain PCM. If your own player cannot open it either, the file is damaged.
Something else went wrong? Tell us what happened — a person reads every report, and that is how this list gets longer.
Privacy and file deletion
- Stored under a random nameUploads have no connection to the file name you sent and are never served from a public directory. This tool accepts files up to 200 MB, several at a time.
- Deleted on a timerUploads are removed within 2 hours and finished results within 24 hours, whichever comes first.
- Nobody looks at themNo one browses uploads, nothing is shared with third parties, and no file is used to train anything. The only thing kept past deletion is the size and timing of the job.
- Encrypted in transitEvery request runs over HTTPS, so the file is encrypted between your device and our server.
Full privacy policyHow the system is builtWhat we measure, and why it is kept
Frequently asked questions
Browse video toolsHow much smaller will it be?
Roughly a tenth at 192 kbps. A CD-quality stereo WAV runs at about 1,411 kbps, so 192 kbps is a factor of seven; 128 kbps is a factor of eleven. The exact number depends on the source sample rate.
Will I hear the difference?
On normal listening equipment, at 192 kbps and above, almost certainly not. WAV is lossless and MP3 is not, so information is genuinely discarded — but MP3 discards it in the places human hearing is least sensitive, which is the whole point of the format.
Should I keep the WAV?
If it is a master recording, yes. Any further editing should happen on the WAV, because each MP3 encode compounds the loss. Treat the MP3 as the distribution copy, not the archive.
Is my file uploaded?
Yes. Encoding needs FFmpeg on our server. Stored under a random name, never listened to, deleted within 24 hours.
How long does my video stay on your server?
Your upload and the finished file are both deleted 24 hours after the job starts. This tool accepts files up to 200 mb and 60 minutes long. Nothing is shared with anyone and there is no account for it to be attached to; while a job is live we may open it in our own admin area to check the encode came out clean.