Shrink WAV recordings into MP3 files about one-seventh the size at 192 kbps, with a bitrate choice and batch conversion. Encoding runs in your browser.
Works in your browser. What you paste or upload is processed on your device.
Click the box or drop up to 20 WAV files onto it.
192 kbps suits most music. Pick 320 kbps for the best quality, or 128 kbps and Mono for speech.
Press Convert to MP3. A progress bar shows each file being encoded.
Download each MP3, or all of them as one ZIP file.
WAV stores audio uncompressed: a minute of CD-quality stereo takes about 10 MB. That is ideal for recording and editing, but too big to email, upload to most sites or keep hundreds of on a phone. MP3 throws away sounds the ear is least likely to notice and keeps the rest. At 192 kbps an MP3 is roughly one-seventh the size of a 16-bit, 44.1 kHz stereo WAV; at 128 kbps about one-eleventh.
This tool reads the WAV file directly in your browser (8, 16, 24 and 32-bit PCM and 32 or 64-bit float, mono, stereo or multichannel), then encodes it with the LAME MP3 encoder in a background thread. WAV files in rarer codecs such as ADPCM are decoded by the browser or, if needed, by an ffmpeg audio engine that downloads once.
Honest limits: MP3 supports sample rates up to 48 kHz, so 88.2, 96 or 192 kHz recordings are resampled to 48 kHz. Surround WAV files are mixed down to stereo. Very long WAV files (over about an hour) need a lot of memory and may fail on phones; use a computer for those.
Studio bounces, field recordings and exported podcast episodes come out as WAV, and most of the places you want to send them have upload limits. Converting to MP3 is the quickest way to make them shareable, and doing it in the browser means unreleased music and private recordings never touch someone else's server.
Something else? Ask the team
A 16-bit, 44.1 kHz stereo WAV uses about 1,411 kbps. An MP3 at 192 kbps is about 14% of that size, at 128 kbps about 9%, and at 320 kbps about 23%. The page shows the estimated size before you convert.
MP3 is lossy, so some detail is removed. At 256 or 320 kbps the difference is very hard to hear on most music; at 128 kbps you may hear it on cymbals and reverb. Keep the WAV as your master copy if you might edit it again.
No. The WAV is read and encoded on your own device in the browser tab. Only a usage count for the free daily run is sent to our server.
Yes. 24-bit and 32-bit float files are read at full precision. Because MP3 tops out at 48 kHz, higher sample rates are resampled to 48 kHz first.
Yes, in Safari and Chrome. Pick WAV files from the Files app or your Downloads. Phones have less memory than computers, so very long recordings (an hour or more) are better converted on a computer.
Up to 20 files per run, each up to 500 MB. All of them count as one run.
You get one free run of this tool per day, and one run converts every file you press the button for (up to 20). After that, each run costs 5 credits (5 US cents) from a free AI Rank Lab account. The free run resets every day.
Each one opens on its own page and works straight away, with no sign-up.
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