Shrink huge uncompressed recordings: free, unlimited, and entirely on your Mac.
Drop your WAV files into AudioRoo’s pouch, choose MP3, and hit Convert. MP3 conversion in AudioRoo is completely free: no trial limits, no account, no subscription, and nothing gets uploaded. Your files never leave your Mac.
Converting WAV to MP3
Which MP3 settings should I choose?
WAV is uncompressed CD-quality stereo runs about 10 MB per minute so converting to MP3 typically shrinks files around ten-fold. By default AudioRoo encodes at High (VBR 2), roughly 170–210 kbps, the same setting FFmpeg’s own encoding guide recommends as a good baseline spot where most listeners can no longer tell the MP3 from the source.
When to change it:
For final mixes and music you want at maximum quality, switch to 320 kbps CBR in advanced mode the biggest files MP3 allows, and the ceiling of the format. For voice recordings, meetings, and field notes, you can go the other way: 96–128 kbps sounds fine for speech, and switching the channel setting to mono halves the file size again. Leave the sample rate auto detected matching your source (usually 44.1 or 48 kHz) upsampling adds size without adding quality.
More WAV to MP3 Questions
Is it really free? How are you making money?
MP3 conversion in AudioRoo is free forever batch processing and advanced settings included. Other output formats have a one-time unlock which is a one-time paid in-app purchase, but free MP3 conversion is unlimited.
Can I convert a whole folder of recordings at once?
Yes. Drop in folders with subfolders and AudioRoo can mirror your folder structure at the destination or flatten everything into one place it remembers your choice.
Do my files get uploaded anywhere?
No. AudioRoo runs entirely on your Mac, powered by a native ARM build of FFmpeg. Nothing is uploaded, nothing is collected. Works offline.
Why are my WAV files so big?
WAV stores audio uncompressed every sample, no shrinking. CD-quality stereo runs about 10 MB per minute. MP3 compresses that around ten-fold at AudioRoo’s default quality, which is why it’s the format of choice for sharing.
Does AudioRoo read high bit-depth or float WAVs?
Yes — anything FFmpeg can open, AudioRoo can read, including 24-bit, 32-bit, and floating-point WAVs. They’re converted down to MP3’s range automatically.