Image Annotator

Screenshots need scribbles, and I got tired of opening a heavy editor to circle one button. This is a thin front end over marker.js: drop in an image, draw freehand or drop a shape on top, and adjust colour and stroke as you go.

The part I actually cared about is undo. It steps back one mark at a time, so if the box you drew around a sketch lands slightly off, you remove just that box and try again — the rest of the session stays untouched. Rendering happens in the browser and the finished image downloads straight to your machine; nothing is uploaded anywhere.