Audio Compressor
Shrink recordings and music by lowering the bitrate, channels and sample rate. See the estimated size before you choose.
How small?
How to use
When it helps
A WAV recording of a meeting or lecture can be over 600MB per hour, far too big for email or chat. Speech does not need as much detail as music, so mono at a low bitrate can make it dozens of times smaller while staying perfectly clear.
Voice is 32kbps mono at 22kHz, about 14MB per hour. Small is 64kbps mono, Normal is 96kbps stereo, and Good is 128kbps stereo. When you add files, their length is read and the estimated size is shown first.
If you are shrinking an MP3 that is already small, quality may drop noticeably. Listen to the result before you decide.
FAQ
How much smaller does it get?
From WAV, usually more than 90%. From a 320kbps MP3, about 90% with Voice. The size depends on length and settings, so the result is very close to the estimate.
What happens if I use Voice for music?
It is mixed to mono and high frequencies are cut, so music sounds muffled. For music, use Normal or higher.
The result is bigger than the original.
This can happen when the original already has a low bitrate. Pick a lower level.
What format is the result?
MP3, which plays everywhere.
Are my files uploaded to a server?
No. Compression happens entirely in your browser.