WhitestScreen

Touch Screen Test

A free touch screen test that maps dead zones on a grid and shows your multi-touch count, how many fingers register at once.

By , WhitestScreen.com

Active touches0
Max this session0
Cells tapped0
Coverage0%
Mode

Tap or drag anywhere on the panel above to test your screen's touch response. Grid mode lights up each cell you touch, so any square that never lights up despite repeated taps is a candidate dead zone. Draw mode traces your finger so you can spot skipped segments or jitter. Touch points are tracked live at the top, which is the easiest way to check your device's real multi-touch support. It's free, works instantly on any touchscreen device, and doesn't require an app or sign-up.

How to use it

  1. Go fullscreen for full coverage, since a non-fullscreen browser leaves the address bar and toolbar covering exactly the edges where dead zones are most common.
  2. In Grid mode, systematically tap every cell, corner to corner, including the very edges.
  3. Try placing several fingers down at once and check the "Active touches" and "Max this session" counters against what your device should support.
  4. Switch to Draw mode and trace slow curves and fast zig-zags. A smooth, unbroken line means healthy tracking; skipped or jumpy segments are worth re-testing on a clean, dry screen.
  5. Tap Clear to reset the grid and canvas between passes.

Frequently asked questions

What counts as a touch dead zone?
A dead zone is an area of the screen that doesn't register touch input at all, even though the display itself shows an image fine there. In grid mode, any cell that never lights up no matter how many times you tap it is a candidate. Try it a few more times before concluding it's a real dead zone, since a single missed tap can happen on a perfectly healthy screen.
How many touch points should my screen support?
Most modern phones support 5 to 10 simultaneous touch points, and most tablets and laptops support 10. iPhone reports 5 touch points at the system level even though the hardware can sense more. If your device supports fewer simultaneous touches than expected for its category, that's worth noting, though it's not necessarily a defect, since some manufacturers cap it intentionally.
Does this detect stylus pressure?
If your stylus and browser support it, yes. Pressure and tilt appear in a small readout when you use it. Finger and mouse input don't report meaningful pressure data, so the readout only appears for real stylus input.
What causes jitter or jumping when I draw on the screen?
A wet or dirty screen is the most common cause, since capacitive touch works by sensing tiny changes in electrical charge, and moisture disrupts that signal. Electrical interference from a cheap charger can also cause drift or ghost touches. If jitter persists on a clean, dry screen away from a charger, it may point to a digitizer issue worth having checked.

Testing a brand-new device? A touch dead zone belongs on the same checklist as a dead pixel. See our new monitor defect checklist for the full return-window walkthrough, or head to the Dead Pixel Test to check the display itself.

Not sure this is your actual problem? Start with the full screen defect triage guide →

Cedrick Reese built this touch test. It listens to the same pointer events any web page receives, lights a grid cell only when your browser reports contact there, and traces your finger in Draw mode, so a gap means the screen didn't report a touch, not that the page guessed. How many simultaneous touches you can see depends on your device and browser as well as the panel.

About the creator

WhitestScreen.com was founded by Cedrick Reese, a retired veteran and web developer who enjoys building free, user-friendly online tools that simplify everyday tasks. More about Cedrick Reese →