Touch Screen Test
Test your touch screen online. Trace the grid to find dead zones, count multi-touch points, and check for ghost touches on phones, tablets, and laptops.
Drag your finger over every part of the screen. Cells turn green when they register a touch. A cell that never fills may sit on a dead zone.
Tip: rest the device on a table without touching it. If markers or painted cells appear on their own, the screen is registering ghost touches.
Check Your Touch Screen Before It Fails You
A single dead strip on a screen can make typing and swiping unreliable long before the display looks damaged. Three quick tests show you exactly where your screen responds, how well it tracks, and how many fingers it can follow.
Why Run a Touch Screen Test
Map Dead Zones Precisely
The grid shows exactly which areas respond and which stay silent, so you can document a fault before a repair or warranty claim.
Count Multi-Touch Points
Games and gestures need several simultaneous touches. The counter shows how many your screen actually tracks.
Diagnose Before You Repair
Separate software glitches and dirty screens from real digitizer damage before paying for a screen replacement.
Nothing Leaves Your Device
Touch input is processed on a local canvas in your browser. No recording, no upload, no app install.
What Each Touch Test Mode Checks
Run all three modes for a complete picture. Together they cover the most common touch faults: unresponsive areas, inaccurate tracking, and phantom inputs on phones, tablets, touchscreen laptops, and 2-in-1 devices.
Dead zone grid
The screen is divided into cells that fill green as you touch them. Any cell you cannot fill, no matter how you swipe over it, marks an unresponsive strip of the digitizer.
Free draw
Trace slow lines and circles. The stroke should follow your finger smoothly. Gaps, sudden jumps, or straight-line shortcuts reveal tracking dropouts.
Multi-touch counter
Each finger gets a numbered, colored marker. Add fingers one at a time to find the maximum number of simultaneous touches your screen reports.
Ghost touch watch
Set the device down without touching it. If markers appear or cells fill on their own, the screen is registering inputs that never happened.
Edge and corner coverage
Cracked digitizers and failing flex cables usually show up along edges first. The grid makes it easy to sweep every border cell.
Full-screen accuracy
The test expands to the whole display so browser toolbars do not hide parts of the screen you need to check.
How to Read Your Touch Test Results
- A cell never fills: clean the screen, remove any screen protector, and retry. If the same spot stays empty, that part of the digitizer is likely damaged.
- Lines break or jump: occasional small jitter is normal. Repeated gaps in the same area, or strokes that leap across the screen, point to a failing digitizer or a loose display cable.
- Fewer touch points than expected: most phones track 5 to 10 fingers and most tablets track 10. A lower count can be a hardware limit rather than a fault, so compare against your device's specifications first.
- Markers appear on their own: ghost touches are commonly caused by moisture, a damaged protector, a worn charging cable, or a faulty digitizer. Dry and clean the screen, unplug the charger, and test again.
- Edges respond poorly: some missed touches near the very edge come from palm rejection built into the operating system. Consistent dead strips along one edge, however, usually mean physical damage.
This test reads the touch events your browser receives. It cannot measure hardware sampling rate in hertz, repair a digitizer, or bypass operating system gestures reserved for screen edges.
How this Touch Screen Test works
This tool reads your screen through pointer events, the browser standard that reports the position and identity of every finger touching the display. The test surface is an HTML canvas element with the touch-action CSS property set to none, which stops the browser from turning your swipes into scrolling or zooming while a test runs. In dead zone grid mode, the canvas is divided into 44-pixel cells. Every pointer position is mapped to a cell through its coordinates, and the cell is painted green the first time it registers a touch. Because a fast swipe can jump over cells between two reported positions, the tool interpolates extra points along the path so the trail stays continuous. Coverage is the share of painted cells out of the total. Free draw mode connects the consecutive positions of each pointer with line segments, which makes tracking dropouts visible as gaps or jumps in the stroke. Multi-touch mode keeps a map of active pointer IDs and redraws a numbered, colored marker for each one on every update, while a counter records the highest number of simultaneous touches seen. The start button requests full screen through the Fullscreen API, with a fixed-viewport fallback for iPhones and restricted browsers. All touch data is processed on the local canvas and discarded when you reset or close the page — nothing is sent anywhere.
How to use this Touch Screen Test
Pick a Test Mode
Start with the dead zone grid, then use free draw for tracking accuracy and multi-touch to count fingers.
Go Full Screen
Tap Start to expand the test surface over the whole display so you can reach every edge and corner.
Cover the Whole Screen
Swipe until every cell fills green. Any cell that stays empty after several passes marks a possible dead zone.
Frequently Asked Questions
What does a touch screen test check?
How do I find dead zones on my screen?
What causes ghost touches?
How many fingers should my screen detect at once?
Why does my screen miss touches near the edges?
Can a screen protector cause touch problems?
My drawn lines look slightly wobbly. Is the screen broken?
Does this test work on touchscreen laptops?
Will this test fix ghost touch or dead zones?
Why can I not swipe from the very edge of the screen?
Is anything recorded while I test my screen?
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