I was looking for a quick way to blur out sensitive information in a screenshot using Preview on a Mac. While I didn’t find an actual blur tool, something can can accomplish the same thing is simply drawing a box around the area you want to hide and pressing delete – see screenshot below where my Access Key ID is whited out:
This seems to only work in image files, not pdfs.
Trying to preview your vide in After Effects, but the audio isn’t playing? In order to play the sound or audio during the video preview, you need to click the “RAM Preview” button in the Preview pain as shown below: