Question 1

How does this screenshot tool work?

Accepted Answer

It uses the browser Screen Capture API (getDisplayMedia) to ask you which screen, window or browser tab to share, then captures a single video frame as a PNG image. Everything happens locally — nothing is uploaded.

Question 2

Why does the browser ask me to pick a screen or window?

Accepted Answer

For privacy, browsers require explicit user consent before any website can capture your screen. A native picker appears — choose Entire Screen, an Application Window, or a Browser Tab, then click Share.

Question 3

Can I capture a specific browser tab?

Accepted Answer

Yes. When the picker appears, switch to the Chrome Tab or Firefox Window option and select the tab you want. Some browsers support getDisplayMedia with the preferTab option for a smoother flow.

Question 4

Why does nothing happen in some browsers?

Accepted Answer

Screen capture requires a modern browser (Chrome 72+, Firefox 66+, Edge 79+, Safari 13+) and HTTPS. If your browser blocks getDisplayMedia, install a browser extension or use the OS print-screen shortcut instead.