Disable macOS screen capture snapshot sound?

Solution 1:

In short: replace the Grab.aif file with a blank audio file.

1. Go to /System/Library/Components

2. Right click on CoreAudio.Component & select Show Package Content

3. Go under Contents/SharedSupport/SystemSounds/system

4. Make a back up of Grab.aif (duplicate it)

5. Replace Grab.aif by an empty audio file

Links/Resources

http://forums.macrumors.com/showthread.php?t=797999

Solution 2:

The easy version: Disable all the sound effects

1. Click on the Apple logo in the top-left corner of your screen and select “System Preferences…”

2. Click on the option that says “Sound”

3. Click on “Sound Effects”