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    Touchscreen Test

    • Coverage: 0%
    • Edges: 0%
    • Corners: 0%

    The touchscreen is an important part of any modern device: smartphone, tablet, laptop or ATM. If it does not work correctly, it can cause freezing, ghost touches or no response to touch.

    How Do I Test a Touchscreen?

    This test draws every registered touch on a full-screen canvas and marks the covered grid cells. Before starting, clean and dry the screen, choose the orientation you normally use, and close controls that could cover its edges.

    1. Leave Show grid enabled to see which cells have responded. Enable Each finger a different color for a clearer multitouch check. Technical data displays the current and maximum simultaneous touches, the input type, and the value reported by navigator.maxTouchPoints.
    2. Press Start test. Slowly draw parallel horizontal and vertical lines across the whole display. Then trace all four edges and corners without lifting your finger.
    3. Place two or more fingers on the screen and move them at the same time. Repeat with as many fingers as you normally use for gestures or games.
    4. Use the clear button to repeat the method from the beginning. The save button downloads the current canvas as a PNG, so you can compare runs or show the result to a technician.

    How Do I Interpret the Results?

    Coverage is the percentage of visible grid cells that registered at least one touch. Edges and Corners measure those harder-to-reach areas separately. A 100% value means that every visible cell responded during this run; it does not measure pressure accuracy or calibrate the display.

    • A gap that appears in the same place after strokes from different directions may indicate a dead or poorly responsive zone.
    • Lines or points that appear without a deliberate touch may indicate ghost touches. Moisture, a charger, a damaged protector, or electrical interference can cause similar symptoms.
    • Low edge or corner coverage means those areas need another careful pass. If they repeatedly ignore input, check whether a case or screen protector overlaps the display.
    • If one of several colored traces stops or jumps, the device may be losing simultaneous touches. The maximum shown is the highest number observed in this run, not a guaranteed hardware specification.

    What Should I Do If the Touchscreen Fails the Test?

    Repeat the test at least twice. Dry the screen and your hands, disconnect the charger, restart the device, and try another browser. If the problem remains, temporarily remove the case or protector and install available system updates. Persistent failure in the same area, especially after a drop or crack, is a reason to back up your data and contact a repair service.

    This browser test cannot identify the exact damaged component. Use the dead-pixel test to separate a visible image defect from a touch-input problem, or the 3D Touch test to check supported pressure input. Touch traces are rendered on the canvas in your current browser; saving creates a local PNG file.

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