iPhone Dead Pixel Test

Check an iPhone display with solid colors in Safari, without installing software. This is a manual visual check: the website shows colors and you inspect the screen. It cannot automatically identify defective pixels, test touch sensitivity or inspect another device remotely.

Open the color test →

Check the display in Safari

1. Follow Apple’s cleaning instructions for your device. Use comfortable brightness and reduce reflections.
2. Open the color test on the iPhone you want to inspect. Select a color to begin. Read the introduction if it appears, then let the hints fade.
3. Inspect white for persistent dark marks and black for persistent bright marks. Compare red, green and blue at the same location to look for subpixel differences. Check several backgrounds before interpreting a mark.
4. Tap to change color or swipe left and right. Double-tap to exit. Touch the screen to reveal hidden controls, then choose Finish check when ready.
5. Try portrait and landscape. Note which areas are actually filled with color in each orientation. Turning the phone does not guarantee coverage of every physical pixel.

Safari viewport and Home Screen limits

If the browser does not grant full-screen mode, the test fills the available browser viewport. Browser controls, the status area, the Dynamic Island or notch, and rounded corners may remain outside the test. A webpage reaching its visible edges is not proof that the whole panel was checked.

An optional alternative is to add the website to your Home Screen. In Safari, use the Share menu and Add to Home Screen; choose Open as Web App if your version offers it, then launch the saved icon. Menu placement varies with Safari layout and iOS version. Apple’s Home Screen instructions explain the available steps.

This changes how you launch the site, but it does not guarantee full panel coverage. Compare the visible areas yourself before recording what was inspected.

Device feedback and what remains unverified

An initial user check on an iPhone 14 Pro running iOS 26.5.2 reported no apparent problems on October 6, 2026. This is limited user feedback, not a compatibility certification or proof of defect detection.

Photograph and record an unusual mark

Dust or a surface mark can look like a pixel defect. After cleaning safely, compare the same location across white, black and the primary colors. A persistent dark or colored dot is an observation, not an automatic hardware diagnosis.

Use another phone or camera to take a wider photo and close-ups of the same area on several backgrounds. A screenshot captures the generated image; it does not record a physical defect in the panel. Keep the original photos and write down the device model, iOS version, browser mode and visible coverage using the observation record.

Do not press, rub or heat the screen. Check the seller’s return deadline and service options for your exact device. Color cycling cannot restore a physically failed pixel; the optional stuck pixel experiment has flashing-light warnings and no guaranteed result.

For a new or used device, use the screen inspection checklist to organize your observations before the return deadline.