Display · No. 15
Touch Screen Test
This tool turns your display into a grid you paint by dragging a finger or mouse. Every cell you touch fills in, so any patch that stays blank exposes a dead zone, while stray marks you never made point to ghost touch. Multi-touch is supported and each finger gets its own color.
Slide across the whole surface. Cells that never fill in point to dead zones or a cracked digitizer. Use multiple fingers at once to check multi-touch. Each finger gets its own color, and the device limit above is what your hardware reports as the maximum simultaneous touch points. Nothing is recorded or uploaded.
How to find dead zones and unresponsive spots
A dead zone is an area of the screen that no longer registers touch, usually caused by a damaged digitizer, a hairline crack, water damage, or a failing display cable. To find one, drag slowly and deliberately so the tool captures a continuous path, and pay special attention to the edges and corners where damage often starts. Any cell that stays empty after you have clearly passed over it is a suspect spot.
Run the drag a few times in different directions to rule out a missed swipe. If the same region refuses to fill every time, that is a strong sign of a hardware dead zone rather than user error. A thin dead line straight across or down the panel often traces back to a loose or damaged internal connector.
The coverage percentage at the top helps here. Once it climbs close to 100 percent, any cells still blank are the areas worth a second look, and you can use them to describe the exact fault to a repair technician.
Checking for ghost touch and multi-touch
Ghost touch is the opposite problem, where the screen reports presses you never made. On this grid it shows up as cells that fill in on their own or as the touch counter rising while your fingers are off the glass. Ghost touch is frequently triggered by a cheap or damaged charger, a poor quality screen protector, dirt or moisture on the panel, or a swollen battery pressing on the display.
The device limit tile reports the maximum simultaneous touch points your hardware advertises, and the max at once tile records how many the tool actually saw. Press down with several fingers together to confirm they all register and match the limit. Most modern phones report five or ten points, and a stylus or damaged panel can change what the device exposes.
What to do if your screen fails the test
If you found a dead zone, first remove any case or screen protector, clean the glass with a soft dry cloth, and restart the device to clear a temporary software glitch. On a phone, install pending system updates and test again, since firmware fixes sometimes restore touch response. If the same area still fails, the digitizer likely needs professional repair or replacement.
For ghost touch, unplug the device and see if the phantom presses stop, which points to a faulty charger or cable as the cause. Remove the screen protector, dry the panel completely, and check for a swelling battery, which is a safety issue that needs immediate service. Persistent ghost touch on a clean, undamaged screen usually means the digitizer or display assembly needs to be repaired.
Frequently Asked Questions
- How do I test my touch screen for dead spots?
- Open this tool, tap Fullscreen, and slowly drag one finger across the entire screen including the edges and corners. Cells fill in as you touch them, so any area that stays blank after you clearly pass over it is a likely dead zone. Repeat the drag a few times to confirm the same spot fails every time.
- What is ghost touch and how do I check for it?
- Ghost touch is when a screen registers presses you did not make, often causing apps to open or text to type on their own. On this grid it appears as cells filling in without your finger or the touch counter rising while you are not touching the screen. A bad charger, damaged screen protector, moisture, or a swollen battery are common causes.
- Why is part of my phone screen not responding to touch?
- An unresponsive area usually means a damaged digitizer from a drop, crack, water, or a failing internal connector. Remove any case or screen protector, clean and dry the glass, and restart the device to rule out a software glitch. If the spot still fails after updates and a restart, it typically needs professional repair.
- How many fingers can my touch screen detect at once?
- The device limit tile shows the maximum simultaneous touch points your hardware reports, and the max at once tile records how many this tool actually detected. Press down with several fingers together to compare the two numbers. Many modern phones support five or ten points.
- Can I test a laptop or tablet touch screen with this tool?
- Yes. The test works on any touch enabled phone, tablet, or laptop, and it also accepts mouse input as a fallback on non touch devices. Use Fullscreen so the grid spans the whole display, then drag across every region. The coverage percentage helps you confirm you reached the entire surface.
- Does this touch screen test record anything?
- No. The test runs entirely in your browser and nothing about your touches is recorded or uploaded. Your coverage and results stay on your device and clear the moment you reset or leave the page.