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DigitalHackingTips · Display Diagnostics

Touch Screen Test Online.

A free, in-browser diagnostic bench for laptops, monitors, TVs and phones. Run it on a brand-new display before the return window closes, or on an old one before you blame the wrong thing.

Dead pixelsStuck pixelsLine defects IPS glowBurn-inColor uniformityBacklight bleed

Test bench

Tap a swatch to jump straight to it, fullscreen

For best results: dim the room for backlight-bleed and IPS-glow checks, set your display to full brightness for dead-pixel and uniformity checks, and give each test a few seconds — some defects only show up after the panel warms up.

What Can This Touch Screen Test Online Tool Detect?

Our display diagnostic tool uses different colors and patterns to make common screen defects easier to spot.

Dead Pixels

A dead pixel may remain black or fail to display correctly. Use the white, red, green, and blue screens to look for small pixels that stay unchanged.

Stuck Pixels

A stuck pixel may remain red, green, blue, or another fixed color. Switch between different color patterns and look for pixels that don't change with the rest of the screen.

Line Defects

Vertical or horizontal lines can indicate a problem with the display panel or its connections. Use the line test to inspect the entire screen for persistent lines.

IPS Glow

IPS glow appears as lighter areas, often near the corners of an IPS display. Check it using a near-black pattern in a dark room and view the screen from your normal position.

OLED Burn-In

OLED burn-in can appear as persistent logos, text, icons, or other shapes. Use fullscreen color patterns to check whether a previous image remains visible.

Backlight Bleed

Backlight bleed appears as brighter areas around the edges or corners of an LCD screen. Use a black fullscreen pattern in a dim room to check for excessive light leakage.

How to Test Your Screen?

Test your screen online with our free screen testing tool by following these guidelines:

1. Prepare Your Display

Before testing:

  • Clean the screen.
  • Use fullscreen mode.
  • Set the display to its native resolution.
  • Disable Night Light or similar color filters.
  • Reduce reflections and glare.
  • Use a dim room for black-screen tests.

2. Run the Full Diagnostic

Start with the full diagnostic to check your display systematically. Inspect the center, edges, and corners instead of focusing on one area.

3. Check Each Color Pattern

Different patterns reveal different problems:

  • White: dead pixels and uniformity
  • Black: backlight bleed and dark-area issues
  • Red, green, blue: stuck or defective subpixels
  • Gray: color and brightness uniformity
  • Line patterns: horizontal and vertical defects

4. Record Any Defects

If you find something unusual, note its location and whether it remains visible across different colors. You can also photograph the screen if you need evidence for a retailer or manufacturer.

How to Identify Common Screen Problems?

Not sure what your screen is actually showing? Dead pixels, stuck pixels, backlight bleed, IPS glow, and screen lines can look surprisingly similar. Here's how to identify the most common display problems and understand what you're seeing.

How to Spot Backlight Bleed?

Display a black fullscreen pattern in a dim room. Check the corners and edges for unusually bright areas. Some edge light can be normal on LCD displays.

Learn More

How to Check for OLED Burn-In?

Display different solid colors and look for persistent logos, text, icons, or shapes. If the same pattern remains visible across different backgrounds, it may indicate image retention or burn-in.

Learn More

Dead Pixel vs. Stuck Pixel

A dead pixel may remain black regardless of the displayed color. A stuck pixel usually remains a fixed color because one or more subpixels are stuck.

Dead Pixel vs. Stuck Pixel: See the Difference

How to Check for IPS Glow?

Display a near-black pattern and slightly change your viewing angle. IPS glow typically changes as your viewing position changes.

Learn More

How to Find Screen Lines?

Use the line test and inspect the entire display. A line that remains in the same position across different colors and applications may indicate a hardware-related problem.

Troubleshoot Black Screen Lines

What Do the Test Results Mean?

A test can reveal a lot, but spotting a problem is only the first step. Learn what dead pixels, stuck pixels, uneven brightness, backlight bleed, screen lines, and burn-in actually mean, and when a result may require further action.

01

One or More Dead Pixels

A consistently dark pixel may indicate a dead pixel. If the display is new, check the manufacturer's pixel-defect policy before requesting a replacement.

02

Stuck Pixel

A pixel that remains a fixed color may be stuck. Run several color tests to confirm that it consistently behaves differently.

03

Uneven Brightness

Dark patches, bright areas, or cloudy sections may indicate uneven display uniformity. Minor variation can be normal depending on the panel.

04

Backlight Bleeding

Bright areas around the edges of a black screen may indicate backlight bleed. Judge it from your normal viewing position rather than relying only on photographs.

05

Permanent Lines

Persistent horizontal or vertical lines can indicate a panel or connection problem. If the line appears only in one application, check your software, cable, and graphics hardware too.

06

OLED Burn-In

Persistent shapes or text on an OLED display may indicate burn-in. If the pattern remains visible across different content, check your manufacturer's warranty or support policy.

Tips for Getting Accurate Screen Test Results

1. Clean the display before testing.

2. Use fullscreen mode.

3. Test multiple colors. Inspect the entire panel.

4. Use a dim room for black-screen tests.

5. Test from your normal viewing position.

6. Let the display warm up before checking subtle defects.

7. Don't press or rub the screen to fix a pixel.

Frequently Asked Questions

Find answers to commonly asked questions about our Online screen testing tool.