What a browser touch test can't diagnose in a stylus

Your stylus skips, draws uneven lines, or fails to respond in one app. A browser touch test can help check whether the screen registers contact in different areas, but it cannot fully test the pen or its special features.

The Touch Screen Test shows touch points and dead zones. Use it to check basic screen response, then use a pen-aware app and the device maker's settings to investigate stylus-specific problems.

Check what the screen registers

1. Open the Touch Screen Test on the device with the touchscreen or connected tablet.
2. Touch the screen with a finger in several areas. Check whether the test shows the points where you touch.
3. Try the stylus in the same areas. Move it slowly across the screen and note whether contact appears, disappears, or skips in a particular place.
4. If the device supports multiple simultaneous touches, try two fingers. This checks touch points, not whether a pen can report pressure or tilt.
5. Repeat the pen test in an app designed for your stylus. Draw slow lines, press lightly and firmly, and try any pen buttons or hover features you use.

A browser may handle a pen as a touch, a mouse-like pointer, or a separate pen input. That depends on the device, browser, and stylus. If the stylus does not appear in the test, that alone does not prove the pen is broken.

What the result means

Your finger registers, but the stylus does not

The test confirms that the screen responds to finger touch in those areas. It does not show that the browser can receive the stylus's separate input signals. Check the pen in a compatible drawing or note-taking app, and confirm that the stylus works with this particular device. A passive capacitive stylus may behave like a finger, while an active pen often needs a supported screen and matching protocol.

The stylus point follows, but drawing still feels wrong

The screen is registering contact, but the test cannot measure pressure sensitivity, tilt, or the pen's pressure curve. A line that stays the same width when you press harder may mean the browser is seeing ordinary touch input, or that the app, pen, or display does not support pressure. Check those features in a pen-aware app rather than treating the browser result as a pressure test.

The point skips in the same part of the screen

A repeated gap can point to a touchscreen dead zone, especially if a finger also fails there. If only the stylus skips, investigate the stylus tip, pen compatibility, and driver before assuming the screen is faulty. Remove accessories that could affect contact, such as a thick screen protector, and repeat the check.

The browser test works, but one app does not

The basic touch path is responding, but that does not confirm the app can use the pen's advanced input or that its settings are correct. Check the app's pen settings and try another app that explicitly supports your stylus. If the pen works elsewhere, focus on the original app rather than the screen.

How to fix stylus problems

1. Confirm the pen is compatible. Check the device maker's specifications for the exact stylus type or protocol supported. A pen that physically fits or sticks to a tablet may still be incompatible with its digitizer.
2. Check the tip and charge. For an active pen, charge it or replace its battery if applicable. Make sure the nib is seated correctly and not worn, loose, or cracked. A passive capacitive stylus may need a clean, undamaged contact tip.
3. Check pairing and pen settings. On Windows 11, open Settings › Bluetooth & devices › Pen & Windows Ink if that page is available, and check the pen options. Use the tablet or stylus manufacturer's driver utility for calibration and pressure settings. On macOS, a connected graphics tablet generally uses its manufacturer's settings app; check System Settings › Bluetooth if the stylus or tablet pairs over Bluetooth.
4. Try a pen-aware app. Draw a line with light and firm pressure, then test tilt or buttons if your device supports them. If the pen works in one app but not another, review the app's input settings and update it.
5. Reconnect the device and restart. Disconnect and reconnect a wired graphics tablet, or remove and pair a Bluetooth device again. Restart the browser or computer if input stopped after sleep or an update.
6. Compare another browser or device. If the stylus works in a compatible app but not in the browser test, the browser may not expose that pen input to the page. If it fails across compatible apps, check the manufacturer's support steps or test another supported stylus.

When the stylus or screen may be faulty

Look for a consistent pattern. If fingers register everywhere but a compatible stylus fails in several pen-aware apps, test that stylus on another compatible device if possible. If it also fails there, the pen or its tip may need replacement. If several compatible pens skip in the same screen area, the digitizer or screen may need service. Keep the device and stylus model numbers handy when contacting support.

Touch input and pen input are not always the same

A touchscreen can detect contact without providing the extra signals a drawing app needs. Depending on the hardware, a pen may use a separate sensor layer or send information such as pressure, tilt, and hover through a supported pen system. The browser test focuses on touch points and dead zones, so it can help locate a basic contact problem, but it cannot certify every function of a stylus.