Mouse doodle pad
Hold the left button and draw whatever you like. You can change the stroke width, clear the pad and start over, or save the drawing as a PNG. This page produces no readings — it is just a drawing pad and makes no judgment about your mouse. To test your mouse, use the diagnostic tools above.
What this pad deliberately does not do
- No readings. It does not count strokes, measure speed, or judge whether your lines are straight. Every other tool page on this site counts something; anything this page could count would be useless — how fast you draw has nothing to do with whether the mouse is any good.
- No color. Keeping the page surface uncolored is a rule across the whole site; see the FAQ.
- It does not use the sampling layer. The trail test’s machinery (sampler plus renderer) was built to measure: it writes every sample into a fixed-length buffer, then reads them back out in a rAF loop to draw. A doodle pad needs draw on press, break on release, and lines that stay put on screen — joining the points directly is the right approach, and wrapping it in that machinery would only add a frame of delay for nothing.
What to do if no line appears
- Make sure the left button is actually held down. This page only draws with the left button; the middle and right buttons do nothing.
- Make sure the pointer is inside the dashed box. The canvas only covers that test area.
- If it still does not work, check whether the other tool pages are behaving. If Buttons shows no response even to the left button, the problem is not this page.
Common questions
No, and this page is not trying to. It produces no readings at all. To judge whether your mouse is faulty, use the diagnostic tools above — each of those pages states how far its numbers can be trusted. Here there is only a pen and a pad. The other way round, though: if the lines you draw have visible breaks, or a line you drew straight comes out jagged, that is worth checking on the trail test page — but you are seeing that with your eyes, not measuring it on this page.
No. The page surface across this site is deliberately uncolored — color is reserved for places that are producing readings, and that split depends on the surface staying uncolored. This pad sits in an instrument panel (dark background, phosphor green), so the pen takes the same color as the trail test page. For colorful drawing, use your system’s own paint program; this page is not competing for that.
No. The pad is a single canvas; every stroke stays inside that canvas and is gone when you close the page. “Save image” converts the canvas to a PNG and downloads it to your own machine — that is the browser’s own download, and has nothing to do with this site.
Yes, and it is one of the few things on this page that loses nothing on a phone — press a finger down and you are drawing. The page disables touch scrolling on the canvas, so a finger sliding across it draws a line instead of scrolling; to scroll the page, start the swipe outside the canvas.
