Test your iPhone screen for dead pixels, stuck pixels, discoloration, backlight bleed and other display faults — directly in your browser, with nothing to install. Just open the full-screen test, cycle through the solid colours, and inspect the screen closely.
📱 iPhone Screen Test
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How to test your iPhone screen
- Clean the screen so dust and smudges are not mistaken for pixel faults.
- Turn brightness up and dim the room so faint defects stand out.
- Open the full-screen test and cycle through black, white, red, green and blue.
- Look closely for any dot that stays dark or stuck on one colour across every background.
Tips for iPhone screens
- View the solid colours in a dark room with brightness turned up to spot faint dead or stuck pixels.
- Remove any screen protector or case first — edge pressure can mimic display faults.
- iPhones rarely ship with dead pixels, and Apple may replace affected units, so test within your return or warranty window.
Why test your iPhone screen?
Catching a faulty pixel or panel defect early makes it far easier to deal with — within a store return window or a manufacturer warranty. Whether your iPhone is brand new, second-hand, or just acting up, a quick test gives you a clear, objective answer.
Open the full-screen test on your iPhone, set brightness high, and step through the solid colours. A dead pixel stays black on every colour; a stuck pixel stays fixed on one colour. Inspect the whole screen, including the corners and edges.
Stuck pixels can sometimes be revived by rapidly cycling colours with our Pixel Fixer. A true dead pixel is a hardware fault with no software fix — in that case, check whether your iPhone is covered by warranty or a return policy.
It depends on the manufacturer. Some replace a screen for a single bright (stuck) pixel; others require several defective pixels before replacing the panel. Test early and keep a record so you can claim within the warranty period.