Touch Screen Test
Quick answer
What is the Touch Screen Test?
A touch screen test checks whether every part of your touchscreen responds. Tap every cell of a grid to find dead zones, draw lines to spot breaks or jitter, and place several fingers at once to see how many touch points your phone or tablet supports.
Key features
- Grid mode that marks each cell as you touch it, with coverage %
- Draw mode to find gaps, jumps and ghost touches
- Multi-touch mode that counts simultaneous fingers
- Works with fingers, stylus and mouse
Why use it
- Find dead zones after a drop or screen repair
- Check a used phone or tablet before buying
- No app install needed
Built and tested by Whitson Rao
About the Touch Screen Test
Test your phone, tablet or touchscreen laptop for dead zones and multi-touch problems. Dead zone grid mode fills each square you touch, so any square that will not light up is a spot your digitizer misses. Draw mode shows whether lines stay smooth and unbroken, and Multi-touch mode shows every finger with its coordinates and counts how many touches your screen tracks at once. Check the display itself with the Dead Pixel Test.
How to use the Touch Screen Test
Choose Dead zone grid and slowly swipe your finger across every square until the coverage reaches 100%.
Squares that will not fill, even with several tries, point to a dead zone.
Switch to Draw and drag slow lines across the screen; breaks or jumps mean missed touches.
Use Multi-touch and put down several fingers to see how many are tracked at once.
Common uses
Unresponsive spots
Find exactly where a phone or tablet ignores touches.
After a screen repair
Check a replacement digitizer before you hand it back.
Buying second-hand
Test the whole surface in a minute.
Ghost touches
Watch for touch points that appear without a finger.
Frequently asked questions
How many touch points should my screen support?
Most phones and tablets track 5–10 fingers. The page shows the number your browser reports and the most it has seen at once.
Does it work with a mouse or stylus?
Yes. Mouse and pen input are drawn too, so you can test a stylus the same way.
What causes dead zones?
Cracked glass, a damaged digitizer cable, moisture, or a screen protector with an air gap. Remove the protector and test again first.