Method 3 · Mobile & display
Open the fullscreen grid and drag your finger across the whole display. Every cell you touch fills in, so any dead zone is easy to see.
Runs in your browser. Nothing is uploaded.
0 / 0 cells (0%)
Drag across the grid to fill every cell
Every cell responded. No dead zones found.
Press Start fullscreen test, then drag over the whole screen, including the edges and corners.
How it works
FAQ
A dead zone is an area of the display that does not register touch. It is often caused by a cracked screen, a bad screen protector, or a failing digitizer.
Some phones reject touches at the very edge to prevent accidental input, and some cases cover it. Try without a case.
Yes. Any display that supports touch or pen input works, and a mouse also paints cells for a quick check.
Open this page on your phone and run your finger across the whole screen, including the corners and edges. Each area you touch is marked on the grid, so any spot that does not respond is easy to see. Test with one finger first, then use the multitouch test to check several fingers at once.
Open the test on the device, then drag your finger over every part of the screen until the grid is filled. Cells that stay empty point to a dead zone. Test the corners and edges, and try slow and fast swipes. This works on phones, tablets and touchscreen laptops.
Yes. You can test your mobile screen online with no app. Open this page in your phone's browser to test touch response. To look for dead or stuck pixels, use the dead pixel test, which fills the screen with solid colours.
Ghost touch is when the screen registers taps you did not make. Open this test, put the phone down and keep your hands off the screen. If marks keep appearing on the grid without any touch, you have ghost touch. Remove the screen protector and case, clean the screen, and make sure your hands and the charger are dry and the phone is not charging with a faulty cable. If it continues, restart the phone, update it, and contact the manufacturer, since persistent ghost touch often means a display or digitizer fault.
Yes. This page runs in your mobile browser, so you can test the touchscreen online without installing anything. Touch and swipe across the screen and watch the grid fill. Nothing is uploaded, because all of the testing happens on your device.
Open this page on the phone, then swipe across the full screen in rows and trace the edges and corners. Any area that stays unmarked is not detecting touch. If you suspect a hardware fault, take a screenshot of the grid to show a repair shop or support team.
No. It is an independent touch screen test. It can help you practise using a touch display, but it is not affiliated with any DMV.
Open this page in Safari, press Start fullscreen test and drag across the screen until every cell is filled. Swipe down from the top or tap Close to leave.
Guide
Press Start fullscreen test and drag a finger over the whole display. Each grid cell fills in when it registers a touch, so a dead zone shows up as a cell that will not fill. The touch screen test iPhone owners run most often is after a screen replacement, and the same grid works on Android phones, tablets and touch laptops.
Many DMV offices use touch screen kiosks for the knowledge test, so a smooth tap-and-swipe habit helps. This is not an official DMV touch screen test and has no connection with any motor vehicle department, but it is a safe way to get comfortable dragging and tapping on a large display, and to rule out your own device when you practise permit questions online.
Remove the case and screen protector, clean the glass, restart the device and test again. If the same cells stay empty, the digitizer is likely damaged. Next try the multi touch test to see how many fingers the screen tracks, and the dead pixel test for display faults.
Keep testing