Touch screen test online. Dead zones and fingers at once.
Draw on the screen with one finger, then several. Lines that break up point at a dead zone; the finger count shows what the screen supports.
One check
- Touch screen
One check after another, with your progress along the top and a plain verdict on each. Nothing you show the camera or say into the microphone leaves this page.
In short
Touch screen test: the answer first
A touch screen test shades every cell of a grid your finger passes through, however fast you swipe, so a stretch the digitiser misses stays blank. It also counts the most fingers seen at once.
Reading your result
- A blank strip
- Remove a thick screen protector and clean the glass. If the strip stays blank, the digitiser is damaged.
- A dead edge
- Many phones ignore the outermost few millimetres on purpose; a gap only there is normal.
- One finger only
- Check the touch screen is enabled in the system or the maker's settings, and that no accessibility setting limits touch.
What it measures
Measured here, not assumed.
- Drawing
- Your drags are drawn as lines, and every cell of a grid the drag passes through is shaded, however fast the swipe. A cell that will not shade under your finger is a stretch the digitiser missed.
- Fingers at once
- The most touch points reported at the same time. Most screens support ten.
- Touch support
- Whether the browser reports a touch screen at all, and how many points it claims.
If it fails
The usual failures, and what fixes each.
- A strip never registers
- Remove a thick screen protector and clean the screen. If the strip stays dead, the digitiser is damaged and the screen assembly is the repair.
- Touches are missed near the edge
- Many phones ignore the outer few millimetres on purpose. A dead edge inside that band is normal.
- Only one finger registers
- On a laptop, check the touch screen is enabled in Device Manager or the maker's settings. On a phone, a system-level accessibility setting can limit touch.
Where a browser stops
What it cannot tell you.
- Ghost touches that happen only in certain apps or at certain temperatures.
- Pressure and stylus tilt, which few browsers expose.
- The screen's edges beyond the browser window.
Privacy
Nothing leaves this page.
The camera and microphone are read on this page and stopped as soon as they have been measured. The clip you can play back lives in the browser's memory and is discarded when you leave. The location check discards the position. The internet test sends random bytes to this site and nothing else. The result is stored nowhere unless you ask for it by email, and then only the fact that an email was sent is kept.
Questions
Touch screen test, answered
- How do I check my touch screen for dead spots?
- Drag one finger slowly across the whole test area in rows. Where the line breaks, the screen missed the touch. Use the full-screen browser mode to cover the edges.
- How many fingers should my screen support?
- Most phones and tablets support ten; laptops usually five or ten. Two is enough for pinch and zoom.
- Is anything recorded?
- No. Touch positions are drawn on this page and discarded.
- Can I test a used phone's screen before buying?
- Yes. Open this page on the phone and draw across the whole surface; the phone test adds the camera, microphone, speakers and sensors.
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