Touchscreen Tester
Drag across a grid to reveal touchscreen dead zones, with live multi-touch tracking and per-finger coordinates.
Processed locally in your browser — nothing is uploaded.
Active touches: 0
Slowly drag a finger across the whole grid — cells paint green as they register. Any cell you cannot paint no matter how you swipe over it is a likely dead zone. Multi-touch is tracked per finger; a mouse or stylus also works for basic pointer testing.
About Touchscreen Tester
Slowly drag a finger across the grid — every cell you touch paints green. Any cell that refuses to paint no matter how you approach it points to a digitizer dead zone. Multiple fingers are tracked separately with live coordinates, so you can also verify multi-touch works.
A mouse or stylus paints too, which makes it handy for basic pointer testing on laptops and convertibles.
Common uses
- Find dead zones on a phone or tablet screen after a drop or screen replacement
- Verify how many simultaneous touches a device actually registers
- Check that a replacement digitizer covers the full panel
Limitations
- The grid covers the browser viewport, not the areas under browser chrome or system bars — test in fullscreen for full coverage.