AAC Compressor
Pick a quality, keep what matters. Free, fast, no signup.
One file at a time for now
Batch processing isn't available yet: drop files one by one, or use the Merger to join them.
- Free, no signup
- No watermark, ever
- Files auto-delete in 1 hour
- Nothing to install
AAC is MP3's better-trained successor: cleaner sound from the same number of bits. Advanced Audio Coding: the default soundtrack of YouTube, iTunes and most MP4 video.
- Born
- 1997, an MPEG all-star team: Fraunhofer, Dolby, Sony, AT&T and Nokia
- Type
- audio · lossy
- Typical size
- similar to MP3, but it sounds better at the same bitrate: or the same at about 25% smaller
- Plays on
- Apple everything, YouTube, Android, modern players; patchy on legacy gear.
- Fun fact
- Every song Apple has sold on iTunes since day one has been AAC, not MP3.
What compressing AAC actually does
AAC is already lossy-compressed, so compressing it further means re-encoding at a lower bitrate. Realistic savings run 30–70%, depending on how generous the original bitrate was: AAC typically runs similar to MP3, but it sounds better at the same bitrate: or the same at about 25% smaller. Squeeze too hard and you will hear it; Flippy's presets stay on the polite side of that line.
Questions people ask
How much smaller will my AAC get?
It depends on how generously it was encoded: AAC typically runs similar to MP3, but it sounds better at the same bitrate: or the same at about 25% smaller, and most files give up 30–70% at the medium preset before quality visibly suffers.
Will I lose quality working with AAC here?
AAC is a lossy format, so re-encoding trims a little detail each time. Work from the best source you have and convert once: at sensible bitrates the difference stays inaudible.
Is this AAC compressor really free?
Yes: free for everyday use with no daily cap, no signup, and your files delete themselves from our servers within an hour. Pro exists for heavy days: bigger files, whole folders at once.