Compress M4A
Drop an M4A and make it smaller, at a quality that still sounds right.
Your file stays on your device. Nothing is uploaded.
Compress M4A in three steps
1.
Drop your M4A
Up to 500 MB.
2.
Pick the target
64 kbps for voice, 96 or 128 kbps for music.
3.
Compress and download
You get a smaller M4A file.
How low can you go
M4A is AAC audio in an MP4-style file, Apple's usual audio format (Voice Memos, GarageBand, iTunes). It sounds a little better than MP3 at the same size.
Bitrate is how much data each second of sound uses. Speech is clear at 64 kbps; music needs 96 to 128 kbps before cymbals and high notes get muddy.
A one hour recording at 64 kbps is about 28 MB.
Frequently
Asked Questions
What bitrate is good for voice?
64 kbps is clear for speech.
Will it sound worse?
At 128 kbps most music sounds fine; lower than 96 kbps, high frequencies suffer.
Is my file uploaded?
No. It's processed in your browser, on your own device, and never leaves it.