Touch Screen Test

How to test your touch screen

1. Go full screen. Open this page on the device you want to check and tap Full screen, so the test covers the whole display. On iPhone the test fills the browser window instead.
2. Fill the grid. In Grid mode, drag one finger slowly across the screen, row by row, until every cell turns green. The bar under the test area counts the cells you’ve touched. Choose a smaller grid size for a finer check.

   

3. Find dead zones. Tap Show missed cells to outline every cell that hasn’t registered in red, then touch those cells directly. A cell that never turns green is a dead zone.

   

4. Draw lines. Switch to Draw and drag slow, straight lines with one finger, then several. Each finger gets its own colour, and every new touch starts with a dot — gaps, extra dots or zigzags show where the screen loses track.

   

5. Check the edges. In Edges mode, slide along all four borders and into every corner, where screens and screen protectors usually fail first.

   

6. Look for ghost touches. Tap Ghost touch check, put the device down and keep your hands away. Any touch recorded during the countdown is a ghost touch and is marked in red.

   

What the readings mean

• Active touches is how many fingers or pens the screen sees right now, and Max at once is the highest number so far. To count every finger your screen can track, use the Multi Touch Test.
• Pointer shows whether the browser received a touch, pen or mouse event — handy for checking that a stylus is recognised as a pen.
• Pressure appears for pressure-sensitive pens such as Apple Pencil, Surface Pen or S Pen, and lines in Draw mode get thicker as you press harder. Most finger touchscreens don’t report pressure, so a dash is normal.
• Position is the x, y coordinate in pixels from the top-left corner of the test area. With Show touch points on, the ring and crosshair should sit right under your finger; if they’re offset, the screen may need calibrating.
• Input rate, under Your touchscreen, is how often the browser receives a new position while a finger moves. Fast screens deliver more updates, which makes drawing and games feel smoother.

Touch screen not working? Fix it step by step

1. Clean and dry the screen. Wipe it with a soft, slightly damp microfibre cloth and let it dry completely. Water, grease and dirt confuse the touch sensor and cause both dead spots and phantom taps.
2. Take off the case and screen protector, then run the grid and edge tests again. A thick, bubbled or cracked protector, or one lifting at the edges, is one of the most common causes of dead edges. On Samsung phones that keep a protector, turn on Settings › Display › Touch sensitivity.
3. Unplug the charger and repeat the ghost touch check. If the check ends with Ghost touches detected, red markers show where the screen registered touches nobody made. Faulty or uncertified chargers and cables add electrical noise that the screen reads as touches, so compare the result on battery power.

   

4. Restart the device. A stuck touch driver often recovers after a reboot. Install pending system updates too — touch firmware fixes often arrive with them.
5. Check the touch settings. iPhone and iPad: in Settings › Accessibility › Touch, turn off Touch Accommodations, which changes how touches are registered and can make the screen seem to ignore taps. In Safari, a swipe from the left edge may go back a page, so start edge swipes slightly inside the screen.
6. Windows touch laptops and 2-in-1s: if the test says No touchscreen detected or touch stops working completely, open Device Manager › Human Interface Devices, then enable, or disable and re-enable, HID-compliant touch screen and update its driver. If touches land in the wrong place, calibrate in Control Panel › Hardware and Sound › Tablet PC Settings › Calibrate.
7. Chromebook: do a hard reset — turn the Chromebook off, then hold Refresh and tap Power. If you’ve enabled the debugging keyboard shortcuts flag, Search + Shift + T switches the touchscreen on and off, so check it hasn’t been turned off by accident.
8. Android: test in safe mode. Press and hold the power button, then touch and hold Power off or Restart until the safe mode option appears (the steps vary by brand). If phantom taps stop in safe mode, an app you installed recently is the likely cause.
9. Get the hardware checked. If the same cells stay dead on a clean screen without a protector, or ghost touches continue on battery power, the digitizer (the touch layer) is probably damaged and needs repair. A swollen battery pressing on the display can cause ghost touches too, so stop using the device and get it checked if the screen bulges.

Keyboard shortcuts

• F Full screen
• C Clear the test
• Esc Exit full screen or cancel the ghost check

About this touch screen test

This free online touch screen test runs entirely in your browser using Pointer Events, so there’s nothing to install and nothing is sent to a server. It works with fingers, pens and a mouse, and on browsers without Pointer Events it falls back to Touch Events.

Use it on Android phones and tablets, iPhone and iPad, Windows touch laptops and 2-in-1s, Chromebooks and touch monitors, in Chrome, Edge, Safari, Firefox or Samsung Internet. Full screen uses your browser’s full-screen mode where it’s available; on iPhone, where web pages can’t go full screen, the test fills the browser window instead.

Frequently asked questions