Special pick: Screencapture.com
Before I explain how to screenshot on a Mac and crop, I’d like to deviate a bit from the topic. I first started with this special tool for one simple reason. I often record the steps I take before I crop a screenshot, and this site helps me show that flow in a short video. So it earns a place here, even if the topic revolves around cutting an image on a Mac.
Screencapture.com runs in any modern browser on a MacBook. Chrome, Safari, Firefox, and the others handle it without trouble. The tool is primarily designed to record a video, not still pictures, so I use it when I want someone to see my screen video. A quick clip often answers a question faster than a written message.
The page loads in a second. You press one button, and the capture starts. The picture stays sharp at standard sizes, and the file comes out in formats people use every day. It does not take the role of a screenshot app. It works as a support tool when video matters.
The online version also covers common needs. You pick whether you want camera input, system sound, or both. You let the site access the mic or cam. Then you choose a tab, a window, or the whole desktop. One click on Share starts the process, and you stop it whenever the point is made. After that, you download the file or record another run.
It supports major browsers used on macOS. It works free of charge. People in many countries use it, and the interface stays simple. That is why I keep it in the toolkit. It lets me explain a screenshot task with a short clip, even when the work itself deals with cutting still images on a Mac.