It stores shapes, not pixels
Which sounds like an implementation detail and decides everything you can do with it. A board held as pixels can only undo by keeping whole snapshots, can only erase by painting white over things, exports at one fixed resolution, and takes a megabyte to save a drawing of three lines.
Holding the strokes themselves means undo is exact however far back you go, the eraser removes the object under the pointer rather than smearing white across it, the SVG export is genuinely resolution-free, and the whole board saves as a few kilobytes.
Why a pen stroke is not every point you drew
A modern pointer reports at 120Hz or more, so one flick of the wrist arrives as several hundred coordinates — nearly all of them sitting on a straight line between their neighbours. Keeping them makes the file large, the redraw slow and the SVG unreadable, and removes nothing you can see.
Each stroke is thinned as you lift the pen, keeping the points that change its shape and dropping the ones that do not. A 400-point scribble typically becomes fewer than a hundred, and looks identical.
Where the board lives
In this browser’s local storage, on this device. There is no account and no server copy — which means nobody else can see it, and also that clearing site data or switching to another machine loses it. Export what you want to keep.
Ctrl+Z and Ctrl+Shift+Z work as you would expect. Clearing the board is undoable in one step, because doing it by accident is common.
Frequently asked questions
Is my drawing saved if I close the tab?
Yes, in this browser on this device. It is not on a server, so clearing site data or opening it elsewhere gives you a blank board. Export anything you need to keep.
Can I collaborate with someone else on it?
No. Real-time collaboration needs a server relaying every stroke, which would mean your board leaving your machine. This is a single-person sketchpad by design.
PNG or SVG?
SVG for anything going into a document or a slide — it scales to any size without softening. PNG for pasting into a chat, where SVG often is not accepted.
Why does the eraser delete a whole line?
Because the board holds objects rather than pixels, so the eraser removes the thing you touched. It is faster than scrubbing, and undo brings it straight back.
Does it work on a tablet?
Yes — it uses pointer events, so a stylus or a finger draws the same as a mouse. Scrolling is disabled over the board so a drag draws rather than pans the page.
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