Shrink your lossless library for everyday listening: free, unlimited, and entirely on your Mac.
Drop your FLAC 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 FLAC to MP3
Which MP3 settings should I choose?
FLAC is lossless, a perfect copy of the source, while MP3 trades a little fidelity for much smaller files. Keep your FLAC files as the archive and treat the MP3s as your portable copies. 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?
If you want the largest, safest MP3s the format allows, switch to 320 kbps CBR in advanced mode the ceiling of the format. For spoken-word FLACs like audiobooks or interviews, you can go the other way: 96–128 kbps sounds fine for voice, and switching the channel setting to mono halves the file size again. Leave the sample rate auto detected matching your source.
More FLAC 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 my whole music library at once?
Yes. Drop in folders with subfolders and AudioRoo can mirror your folder structure at the destination or flatten everything into one place.
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.
Will converting FLAC to MP3 lose quality?
Technically yes MP3 is a lossy format. In practice, at AudioRoo’s default High (VBR 2) setting most listeners can’t tell the difference on normal playback gear. Keep your FLACs as the archive and you lose nothing permanently.
Can AudioRoo read hi-res FLAC (24-bit, 96/192 kHz)?
Yes anything FFmpeg can open, AudioRoo can read, including hi-res FLAC. MP3 itself tops out at 48 kHz, so hi-res sources are converted down to fit the format automatically.