Touch Screen Test
Check that every part of your phone, tablet or laptop touchscreen responds. See each finger as a numbered circle, count how many touches register at once, draw to spot jumpy lines and sweep a grid to find dead zones.
How to use the Touch Screen Test
- Pick a mode: Multi-touch to count fingers, Draw trails to check smooth tracking, or Dead-zone grid to check every area.
- Press Start full-screen test so the test area covers the whole display, edges included.
- Touch the screen with one or more fingers. Each contact gets a numbered circle and the counters update instantly.
- In grid mode, swipe over every cell. Cells turn green when they register; press Show missed cells to see any that stayed empty.
- Press Clear to reset the drawing, the grid and the counters and test again.
What each mode tells you
| Mode | What to do | Healthy result | Warning signs |
|---|---|---|---|
| Multi-touch | Place fingers one at a time, then all together | Each finger gets its own circle that follows smoothly; the maximum matches your device (often 5 or 10) | Circles that vanish, swap numbers, jump, or appear with no finger on the glass |
| Draw trails | Draw slow straight lines and fast circles across the whole panel | Continuous lines with smooth curves | Gaps, zig-zags along straight lines, or lines that bend near the edges |
| Dead-zone grid | Swipe over every cell in rows, then in columns | 100% coverage after one or two passes | A row, column or patch of cells that never turns green |
Typical touch point limits
The number of fingers a screen can track at the same time depends on the touch controller, not on the size of the display. These are common values; your own device may differ.
| Device type | Typical simultaneous touches |
|---|---|
| Modern smartphones (Android and iPhone) | 5 to 10 |
| Tablets | 10 or more |
| Touchscreen laptops and 2-in-1s | 5 to 10 |
| Interactive displays and kiosks | 10 to 40 |
| Older resistive or budget screens | 1 or 2 |
Fixing an unresponsive touchscreen
- Clean and dry the glass. Water drops and grease confuse capacitive sensors and cause both dead spots and ghost touches.
- Remove the screen protector or case and test again. Thick or bubbled protectors and tight case lips are a common cause of dead edges.
- Unplug the charger. Cheap chargers can add electrical noise that makes touches jump or register on their own.
- Restart the device and install system updates, which often include touch firmware fixes.
- Recalibrate if your system offers it (for example the Windows "Calibrate the screen for pen or touch input" setting).
- If the same cells stay dead after all of this, the digitizer or its cable is probably damaged and needs a repair.
Frequently asked questions
How do I test my touch screen?
Open this page on the device, press Start full-screen test and touch the screen. In Multi-touch mode every finger shows as a numbered circle. In Dead-zone grid mode swipe over every cell; any cell that never turns green after several tries is a likely dead zone.
How many touch points does my screen support?
Place as many fingers as you can on the screen in Multi-touch mode and read the Max at once counter. Most modern phones and tablets detect 10 touches, many laptops detect 5 or 10, and some older or budget screens detect only 2. The note under the test also shows the number your browser reports.
What is a touch screen dead zone?
A dead zone is an area of the touchscreen that does not register touches, often caused by a damaged digitizer, a cracked panel, a badly fitted screen protector or a loose connector. It usually shows up as a line or patch of cells that never light up in the grid test.
Why does my screen register ghost touches?
Ghost touches are contacts that appear without a finger on the screen. Moisture, a dirty or cracked panel, a faulty charger or a poorly grounded device can cause them. If circles appear on their own in Multi-touch mode, clean and dry the screen, unplug the charger and test again.
Does the test show touch pressure?
Yes, if your device reports it. Most phones report a fixed value of 0.50 for fingers, while pens and some tablets report real pressure between 0 and 1. The contact width and height are shown when the browser provides them.
Can I test a touchscreen laptop or a monitor?
Yes. The test works in any modern browser on Windows, macOS, ChromeOS, Android and iOS. On a computer without a touchscreen you can still click and drag with a mouse or pen to try the tool.
Is anything recorded or uploaded?
No. The test runs entirely in your browser. Touch positions are drawn on the page and are never stored or sent anywhere.