Screen test

Touchscreen Dead-Zone Tester

Drag a finger across every part of the grid. Touched areas turn green, making skipped or unresponsive spots easy to see.

Runs locally — touch data stays here

Use one or more fingers. Try slow horizontal and vertical lines.

How to use this touchscreen dead-zone tester

Open the page on the touch device, enter full screen, and drag a finger slowly through every row and column of the grid.
Repeat the same movement across the full test area. A problem that appears in the same place on each pass is more useful than a single missed input.
Repeat the test once if the result looks unusual, then record the final reading you want to keep.

About this touchscreen dead-zone tester

Touchscreen Dead-Zone Tester helps you draw across your screen to find missed touch areas and dead zones. The input and result appear together for easy comparison.

You can also use it to check a screen protector or recent repair.

Example

If every grid square turns green except the same narrow patch after two passes, that patch may be missing touch input.

Common uses

→ find unresponsive areas on a phone or tablet
→ check a screen protector or recent repair
→ compare touch coverage before and after a restart