Touch Screen Test: Check Multi-Touch & Sampling Rate

Test your phone, tablet, or iPad's touch screen online: 10-point multi-touch, sampling rate in Hz, and drag lines that reveal dead zones and dropouts.

Updated 2026-08-16

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Features

10-point multi-touch: every finger is tracked with its own numbered dot, so you can press all ten fingers at once and see each one register
Touch sampling rate in Hz: the tool counts touchmove events per second in a rolling window, revealing the screen's real touch response rate
Peak sampling rate tracking: the highest Hz seen during the session is kept, useful for comparing against a phone's spec sheet (120/240/360 Hz panels)
Dropout detection: sudden jumps in a drag line are flagged and counted, the classic sign of touch signal loss or a faulty digitizer
Multi-color drag lines: each finger draws its own colored line, so broken or skipped strokes are easy to spot by color
Dead zone hunting: drag slowly across every part of the screen; any area where the line skips is a candidate dead zone
Works on any touch device: phones, tablets, and touch laptops with Chrome, Safari, or Firefox
Perfect for second-hand phone inspection: verify touch health before paying, alongside the gyroscope test for a full sensor checkup
No installation: runs entirely in the browser, nothing to download

How to Use

1Open this page on your phone or touch device; the test area occupies most of the screen for maximum coverage.
2Touch the test area with one finger and drag slowly across the whole screen; the line should be continuous everywhere you drag.
3Press with 2, 5, and finally 10 fingers at once; every finger should show a numbered dot. Missing dots mean that touch point is dead.
4Watch the sampling rate: move a finger quickly and note the Hz. A 120 Hz panel should show close to 120 Hz, a 240 Hz panel near 240 Hz.
5Check the dropout counter while dragging; each jump in your line adds one. Multiple dropouts in the same spot point to a faulty digitizer area.
6For a dead zone check: drag in slow straight lines from edge to edge, covering the full screen in a grid pattern.
7After a screen repair, run this test before accepting the repair; broken digitizers show up as missing touches or skipped lines.
8Clear the lines between tests so each pass starts fresh; the Clear button resets the canvas and counters.

Frequently Asked Questions

Why is my iPhone touch screen not registering touches?

Run a web-based test like this one in Safari first; iPhones have no dialer test code like Samsung's *#0*#, and a clean test result (no dead zones, no dropouts) points to software, not hardware. Check Settings > Accessibility > Touch > Touch Accommodations to see whether hold duration or ignore-repeat options are filtering your touches, then restart the iPhone and test in a different app. If the same area fails everywhere, the digitizer or its connection is faulty and needs repair.

My iPad or tablet touch screen is not working, can this test help?

Yes, tablets run the same touch event pipeline as phones, so multi-touch dots, sampling rate, and drag lines all work. iPad Pro models report 120 Hz touch sampling, most Android tablets 60–120 Hz. The larger screen actually makes dead-zone hunting easier, since a full-screen drag covers more area per pass. If your iPad screen is unresponsive or jumpy, run the drag test first to see whether the problem is a dead zone, dropouts, or a software issue. Note that iPadOS mouse and trackpad input doesn't count as touch; use your finger or a stylus (a stylus is also a great way to test the full screen without finger smudges).

What is the touch screen test code for my phone?

Some Android phones, especially Samsung, have a built-in hardware test menu you can open with a dialer code (Samsung: *#0*# → tap Touch); iPhones have no such code. This tool is a web-based test that needs no code at all: open this page and the test area is ready immediately. The two methods complement each other: the dialer code tests the digitizer at the system level, while this page tests what browsers and apps actually receive.

How do I test my phone touch screen?

Open this page on the phone and drag one finger slowly across every part of the screen; the colored line must stay continuous. Then press all 10 fingers at once and confirm every dot appears. A missing dot, a broken line, or a rising dropout count in the same area means that part of the digitizer is faulty. On a 120 Hz panel, the sampling rate should read close to 120 Hz when you move a finger quickly.

What is touch sampling rate and why does it matter?

Touch sampling rate is how many times per second the screen reads your finger position, measured in Hz. A 60 Hz screen reads 60 times per second, a 120 Hz panel 120 times, and gaming phones reach 240 or even 360 Hz. It matters because higher sampling makes touches feel more responsive and helps in fast games. This tool measures the rate your browser actually receives, which reflects the panel and driver working together.

Why is my touch screen not responding in some spots?

Dead zones are usually caused by a cracked or damaged digitizer, a loose screen connector after repair, or in rare cases a failing touch controller. Run the drag test and drag slowly across the whole screen; areas where the line skips or the touch stops responding are the dead zones. If dead zones appeared after a screen replacement, the digitizer cable is likely not seated properly and the repair shop should re-check it.

My phone registers only one touch at a time, is that normal?

No. Modern phones support at least 5 and usually 10 simultaneous touches, so single-touch-only is a digitizer fault. If only one finger registers or touches interfere with each other, the digitizer or its connection is faulty, commonly after a bad screen repair. Test with all 10 fingers: every finger should get its own numbered dot. Interference between fingers (dots merging or dropping) is a digitizer signal problem.

What does a broken line in the drag test mean?

A broken or skipped line means the screen lost the touch signal while you were dragging; the touch events between the gap were never delivered. One small gap can be a palm or thumb edge case, but gaps that repeat in the same location point to a faulty digitizer row or a damaged connector. Count the dropouts: a healthy screen shows zero or very few during a full-screen drag.

Why does the sampling rate show lower than my phone's spec?

The browser only delivers touch events as fast as the page can process them, so the measured rate is usually a bit lower than the panel's marketing spec. It also depends on how fast you move your finger; slow movement produces fewer move events. For a fair comparison, flick your finger quickly and compare the peak reading to the spec. A rate far below spec (like 60 Hz on a 240 Hz phone) can indicate a driver or screen problem.

Can this test detect a screen problem after a repair?

Yes, detecting repair problems is one of its main uses: poorly reconnected digitizers after screen or battery replacement cause missing touches, dead zones, and broken drag lines. Run the 10-finger test and the full-screen drag test after any repair. If specific spots don't respond or lines break in the same area every time, the connector needs to be re-seated by the repair shop.

My touch screen works but feels laggy: what should I check?

Laggy touch has several causes: a low sampling rate (check the Hz reading; below 60 Hz is poor), heavy background apps consuming CPU, a thick screen protector or old glass, and in some cases a damaged digitizer. Check the sampling rate first, then close background apps and retest. If the rate is fine but touch still feels delayed, the issue is likely software or the protector, not the panel.

Does a screen protector affect this test?

It can. Thick or poorly applied protectors reduce touch sensitivity and can cause missed touches, especially at the edges. Tempered glass with an air gap is the usual culprit. If the test shows dead zones or broken lines, remove the protector and retest before concluding the screen is faulty; a protector issue costs nothing to fix, a digitizer issue doesn't.

Why do touches jump when I drag quickly?

Fast drags produce large distances between consecutive touch events; a jump of 60+ pixels between two moves usually means the digitizer dropped intermediate samples. One jump during a very fast flick is normal; repeated jumps at the same position, or a rising dropout count during normal-speed dragging, indicates a digitizer or cable problem worth checking by a repair shop.

Is this touch test accurate? Can a browser really measure sampling rate?

The browser can't access the digitizer hardware directly; it reports the touch events the OS delivers. So the measurement is a practical estimate of what apps actually receive, which is what matters for real-world responsiveness. The dropout and dead-zone tests are quite reliable because they detect missing events, not hardware internals. For lab-grade measurements you would need a factory service tool.

What should the touch screen test show on a healthy phone?

A healthy phone shows: all 10 fingers register as numbered dots simultaneously, the drag line is continuous across every part of the screen, the dropout counter stays at 0 or very low, and the sampling rate reads near the panel's spec (60/120/240 Hz) when you move quickly. Any repeated deviation from these four points is worth investigating.

Why is the touch screen ghost-touching or typing by itself?

Ghost touches (phantom inputs without your finger) are a digitizer failure or interference symptom: a damaged digitizer, water damage, a failing touch controller, or electromagnetic interference from a faulty charger. This tool can't detect ghost touches directly because no events originate from your finger; the first diagnostic step is removing the charger and screen protector, then testing in a clean area. Persistent ghost touches need a repair shop.

Can I test a laptop touchscreen with this tool?

Yes. Touch laptops run the same touch event pipeline, so all tests work: multi-touch dots, sampling rate, and drag lines. Some touch laptops report lower sampling rates (60 Hz is common); that's normal for the hardware, not a fault. Note that the test measures the touchscreen, not the trackpad: trackpads are a separate device and won't trigger touch events.

Why does the test not work on my desktop computer?

Desktop computers without a touchscreen don't generate touch events, so the test area stays empty; that's expected, not a bug. The tool detects this and shows a notice. If your monitor has touch capability, make sure the touch driver is installed and the USB cable carries touch data. This test is designed for phones, tablets, and touch laptops.

Does the dropout counter reset by itself?

No. The dropout counter accumulates until you press Clear lines, which resets the counter, the peak sampling rate, and the canvas. This is intentional: during a second-hand phone inspection you want one cumulative count for the whole session. If you're testing a specific spot repeatedly, press Clear before each pass so you can tell whether that spot consistently produces dropouts.