Phone Screen Test

A full phone-screen checkup — dead pixels, color, focus and more — plus refresh-rate and touch tests, all built for phones and tablets.

On a phone or tablet? Tap to scan

Point your phone camera at the QR code to open this test on mobile.

▶ Run the display test

Start with the solid-color test, then work through all 8 checks in order. Tap the screen to move to the next test project. a total of 32 steps

💡 Operation tips
  1. Tap anywhere on the screen to move to the next view; when the current check finishes it advances, and exits fullscreen once all checks are done.
  2. Swipe left to go back to the previous view; it stops at the very first view.
  3. After entering fullscreen, the top title and bottom controls auto-hide so the screen stays unobstructed.
  4. Touch the bottom-centre zone to bring the title and controls back; move away and they hide again.
  5. The breathing test ends and exits fullscreen automatically after about 10 seconds.

Phone screen tests

Why choose the phone screen test?

Built for phone screens

Big tap targets, swipe navigation and fullscreen tap-to-advance — the full display checkup, reworked for hands.

Covers the real checkpoints

Dead / stuck pixels, backlight bleed, color accuracy, focus and dark-level detail in one place, plus refresh-rate and touch tests.

Fullscreen immersion

Request fullscreen and slide finger to move to the next view; on iPhone where the API is restricted it still uses a full-viewport overlay.

Free, private, no install

Nothing to download, no account needed — everything runs in your browser. No screen image ever leaves your device.

How to start testing

  1. 01 · Open in a phone browser

    Landscape + max brightness gives the most accurate results; switch off night / dark-mode color filters first.

  2. 02 · Run the display check

    Tap the big button (or a single tab). The overlay fills the screen and steps through colors, backlight, grayscale and grids.

  3. 03 · Judge and record

    Tap / swipe left to advance, swipe right to go back; mark any dead or bleeding spots, and screenshot anything unusual as evidence.

Frequently asked questions

What’s a dead pixel, and how is it different from a bright or stuck pixel?

A dead pixel is a spot that fails to change color. Bright pixels stay white or colored on dark screens, dark / stuck pixels stay black on light screens, and tinted pixels hold a single color like red, green or blue. A few dark pixels are usually more noticeable, and most manufacturers set warranty thresholds — check your official after-sales policy.

Is backlight bleed a quality defect?

Slight bleed is within normal manufacturing tolerance on many OLED / LCD panels, especially visible in a fully dark room and at wide angles. If the bleed is large and clearly visible at normal viewing angles and brightness, contact support or get it serviced.

How long does the test take?

The full display check takes about 2–3 minutes; adding the refresh-rate and touch tests brings it to around 5 minutes. Test only the items you care about if you’re in a hurry.

Which phones and browsers are supported?

iOS and Android default browsers plus Chrome, Safari and Edge, with no plugins needed. Older devices or browsers may measure refresh rate less accurately — the system browser usually gives the best result.

Can a web test find every screen hardware problem?

It covers the common visible issues — dead pixels, bleed, color, touch and refresh rate — so it catches most problems you can see with your eyes. It can’t fully replace professional gear; for deeper faults (ribbon cables, display driver IC) go to official service or a repair shop.

What should I watch during testing?

Test for dead pixels and bleed in a dim room without direct light, and raise brightness to max to spot anomalies more clearly; turn off night mode and color filters for the color and uniformity checks.