Touch Screen Test for Dead Zones & Multi-Touch
Run a touch screen test right in your browser to check whether every part of the display responds correctly. Tap, swipe, and drag to spot dead zones, confirm multi-touch support, and judge how accurately your screen tracks your finger.
It is handy before buying a used phone, after a screen repair, or any time touch feels off. Two modes cover it: Grid mode turns each touched cell green so unresponsive areas stand out, and Draw mode lets you draw freely to test accuracy and trail smoothness.
How to Test Your Touch Screen
Start the test
Press Start Test. The tester tries to open in fullscreen so you can reach the entire screen, including edges and corners. Press Esc or Exit to leave at any time.
Sweep in Grid mode
Grid mode is on by default. Swipe across the whole screen so every cell turns green. The progress percentage shows how much you have covered; any cells that stay dark mark a possible dead zone.
Adjust cell size (optional)
Use the − and + buttons to change cell size from 10px to 100px in 5px steps. Smaller cells test in finer detail; larger cells cover the screen faster. The grid rebuilds automatically.
Draw to check accuracy
Tap Draw, then drag your finger to leave a glowing trail. A smooth, continuous line means good tracking; breaks or gaps point to trouble spots, especially near edges and corners.
Test multi-touch
Place several fingers on the screen at once. The live counter shows how many touches are detected, and Max Points records the highest you reached. Most phones support 5 to 10 simultaneous points.
Features
Grid Mode
Touched cells turn green while a progress percentage tracks coverage, so any unresponsive dead zone stays dark and easy to spot.
Adjustable Grid Density
Set cell size from 10px to 100px in 5px steps. The grid adapts to your screen and rebuilds instantly whenever you change it.
Draw Mode
Drag your finger to draw a smooth, glowing trail that follows your movement precisely, revealing any spots where tracking breaks.
Color-Coded Fingers
Each touch draws in its own color, with up to 10 distinct colors, so you can follow several fingers at once.
Multi-Touch Detection
A live counter shows current active touches and a Max Points stat records the most you managed at the same time.
Distraction-Free Display
The header and toolbar auto-hide while you touch the screen, leaving a clean dark canvas with high-contrast touch points.
Fullscreen Testing
The test opens in fullscreen where supported so you can reach edges and corners, and exits cleanly with Exit or the Escape key.
Works on Any Touch Device
Use it on phones, tablets, touch laptops, and touchscreen monitors, with mouse support as a fallback on a desktop.
Frequently Asked Questions
How do I test my touch screen?
Press Start Test, then swipe across the whole screen in Grid mode so every cell turns green. Switch to Draw mode to drag your finger and check tracking. Nothing to install — open the page and test.
How do I find dead zones or dead spots on a touchscreen?
Use Grid mode and swipe slowly across every part of the screen. Touched cells turn green, so any cell that stays dark after you cover that area marks a likely dead zone. Shrink the cell size to catch smaller spots.
How do I test multi-touch and how many fingers should work?
Place several fingers on the screen at once. The center counter shows how many touches are detected and the Max Points stat keeps the highest. Most modern phones and tablets support 5 to 10 simultaneous touch points.
What is ghost touch and how do I detect it?
Ghost touch is when the screen registers taps you never made. Open Draw mode, keep your fingers off the screen, and watch for trails or touch points that appear on their own. Random marks or a counter that rises by itself point to ghost touch.
Why do lines break or skip when I draw?
Broken or choppy trails usually mean a dead zone, reduced touch sensitivity, screen-protector interference, or a failing digitizer. Try cleaning the screen and removing any protector, then draw across the same area again.
Does this work without installing an app?
Yes. It runs entirely in your browser, with no app, download, or sign-up. It works in modern browsers such as Chrome, Safari, Firefox, and Edge; your device's default browser usually gives the most accurate results.
Can this tool detect screen damage?
It checks touch responsiveness, not visual damage. A cracked screen can still pass if touch works, and a screen that looks fine can still hide dead zones this test will reveal.
Is my data stored or sent anywhere?
No. Every test runs locally in your browser. No touch data, device information, or results are sent to any server, so your privacy is fully protected.
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