My PC Tester

Screen Test

8 fullscreen checkups — dead pixels, backlight bleed, focus, contrast and more.

→ Refresh-rate test — click here to go

▶ Run the full screen check

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

💡 Operation tips
  1. Click the right half of the screen to move to the next view; when the current project’s views are done it advances to the next project, and when every project is finished it exits fullscreen automatically.
  2. Click the left half of the screen to go back to the previous view; at the very first view it stops.
  3. After entering fullscreen, the top label and bottom buttons auto-hide after 3 seconds so you can view the screen unobstructed.
  4. Hover in the bottom-centre of the screen for 1 second to bring the label and buttons back; move away and they hide again after 1 second.
  5. The breathing test ends automatically after about 10 seconds.

Screen tests

Dead / Stuck Pixels : Fullscreen solid colors to hunt bright, dark and tinted pixels. Backlight Test : Detect light bleeding from the edges and corners on black backgrounds. Interference Test : Checker, line and grid patterns to reveal moiré and striping. Focus Test : Text, lines and shapes to check sharpness and sharp edges. Contrast Test : Black-white gradients to gauge tonal depth and smooth transition. Grayscale Test : A stepped gray ramp to check uniformity and banding. Color Saturation : Vivid solid colors to assess gamut coverage and color accuracy. Breathing Test : Watch a static gray screen to judge periodic brightness pulsing.

Why choose My PC Tester?

Install-free, privacy safe

Runs entirely in the browser — nothing to download. Every test runs locally and no screen data is uploaded.

Eight-in-one checking

Dead pixels, backlight, interference, focus, contrast, grayscale, saturation and breathing — a complete screen exam in one place.

Fullscreen immersion

One click enters fullscreen mode, clearing the browser UI so patterns cover every pixel for more accurate results.

Free and easy

Everything is permanently free with no sign-up. Guided tips, arrow keys and shortcuts switch colors and modes easily.

Works on phones & tablets

Runs right in your phone browser: tap to switch patterns and inspect dead pixels or backlight bleed fullscreen — perfect for on-the-spot checks when buying a used phone or tablet.

How to start testing

  1. 01 · Pick a test

    Click “Run the full screen check” or any single sub-test to enter fullscreen; you can also open one test page directly.

  2. 02 · Scan the screen

    In fullscreen, look over every region and use the arrow keys to switch solid colors, patterns or directions.

  3. 03 · Judge the result

    Decide whether you spot dead pixels, bleed, tint or other faults. Click the right half to move on, or press ESC to exit.

Frequently asked questions

I found a dead pixel — can I get a replacement?

Under most makers’ policies, up to 3 dead pixels count as normal. But some premium brands (Dell UltraSharp, EIZO) promise a zero-bright-dot guarantee. Test a new monitor immediately and contact support within the return window.

Is IPS backlight bleed normal?

Mild IPS Glow is a physical trait of IPS panels and is almost impossible to avoid. Severe edge bleed that visibly hurts dark scenes at normal brightness and distance is a quality-control issue and can be exchanged.

Why can’t I enter fullscreen?

Some browsers restrict the fullscreen API. Use the latest Chrome/Edge/Firefox, allow fullscreen permission, and trigger it by clicking the button on the page. Even without fullscreen, the test continues in a window.

Will the test damage my screen?

No — the tool only displays patterns and colors, which cannot hurt a display. That said, leaving an OLED on a solid white frame for very long can accelerate ageing, so keep each test under a minute.

I see obvious banding in the grayscale test — why?

It usually comes from a shallow panel color depth (6-bit dithered to simulate 8-bit), a wrong output bit-depth in the GPU driver, or insufficient interface bandwidth. Set 8-bit/10-bit full-range output in the driver and use HDMI 2.0+ or DP 1.4+.

Can I use it on a phone or tablet?

Yes — just open the page. Landscape orientation and higher brightness help, and since mobile screens are small you can use the system zoom when hunting dead pixels.