Touch Screen Test
Drag across the screen to find dead spots, and see how many fingers it tracks at once.
How to use the Touch Screen Test
- Drag one finger around the box — a line follows it.
- A gap in the line means the screen missed your touch there.
- Put several fingers down to see how many it tracks at once.
About the Touch Screen Test
Drag a finger across the pad and this tool draws the line your screen actually reported. A gap in the stroke, a jump, or a patch where nothing appears at all is a dead zone in the digitiser — the kind of fault that is obvious once you can see it drawn, and almost impossible to prove by poking at an app. Every touch gets its own colour, so you can put several fingers down and watch each one traced separately.
It is built on Pointer Events, which means it works in every current browser and treats a mouse exactly like a finger. On a desktop that is still useful for checking a trackpad or a pen, and the tool says so plainly: if the device reports no touch points it warns you up front rather than pretending it found a broken screen. The counter shows how many contacts are down right now, the most you have managed at once, and the hardware limit the browser reports via navigator.maxTouchPoints — which is the number the panel itself claims to support.
If the picture looks fine but something still seems off, a dead pixel test checks the panel underneath the glass. The mobile and tablet tests cover the rest of the device.
Frequently asked questions
How do I find a dead zone on my touch screen?
Drag slowly across the whole pad in overlapping passes, corner to corner and edge to edge. Wherever the line breaks or refuses to start, the digitiser is not reporting touches. Because the drawing stays on screen you can look at the finished pattern rather than trying to notice a problem in the moment.
How many fingers should my screen detect?
Most modern phones track five or ten, and the tool shows the limit your browser reports from navigator.maxTouchPoints. Put as many fingers down as you can and compare the live count with that number. If you can only reach two or three on a panel that claims ten, that is worth investigating.
Can I use this on a desktop with a mouse?
Yes. It uses Pointer Events, so a mouse, a trackpad and a stylus all draw exactly like a finger. On a machine with no touch hardware the tool warns you that no touch points were reported, so you do not mistake a normal desktop for a broken screen.
Does it work with a stylus or pen?
A pen registers as a pointer, so it draws normally and you can check the pen reaches every part of the surface. The tool does not read pressure or tilt values, so it will not tell you anything about pressure sensitivity.
Why does the page not scroll while I am drawing?
Scrolling and zooming are deliberately blocked inside the test pad, otherwise every drag would move the page instead of drawing a line. Outside the pad the page scrolls normally.