Monitor Test Online
Check a monitor, laptop, phone, tablet, or TV screen with fullscreen patterns for dead pixels, backlight bleed, uniformity, color, contrast, gamma, text clarity, and motion.
Live screen test
Start with the real patterns.
Find dark dead pixels and dust spots.
Recommended flow
Test the screen in the right order.
- 01
Pixel sweep
Start with white, black, red, green, and blue screens for dead or stuck pixels.
- 02
Panel quality
Use black and gray fields for backlight bleed, dirty screen effect, and uniformity.
- 03
Tone and motion
Finish with brightness, contrast, gamma, text clarity, response time, and refresh checks.
Tools
Display tests for every common screen issue
Dead Pixel Test
Use full-screen color fills to find pixels that stay black, white, or visibly different from the surrounding panel.
Stuck Pixel Test
A stuck pixel often stays red, green, or blue. Cycle primary colors to spot the subpixel that is not changing correctly.
Backlight Bleed Test
A dark room and a full black screen make edge leakage, cloudy corners, and panel glow easier to judge.
Screen Uniformity Test
Uniformity patterns help you see whether brightness and color remain consistent from center to corners.
Brightness Test
The brightness test helps you set a comfortable level while keeping near-black and near-white detail visible.
Contrast Test
Use stepped tone patterns to see whether your display keeps dark and bright details separate.
Gamma Test
Gamma affects midtone brightness. This test gives you reference patterns for judging whether gray steps look balanced.
Color Banding Test
Smooth gradients reveal banding, posterization, and compression-like steps that flat color screens can hide.
Response Time Test
Moving blocks and high-contrast edges make slow transitions, dark smearing, and overshoot easier to see.
Ghosting Test
Ghosting appears as visible trails behind moving objects. This page gives you a quick motion target for tuning the display.
Text Clarity Test
Text samples and fine lines help reveal blur, wrong scaling, subpixel issues, and overly sharp processing.
Monitor Test Patterns
Test patterns combine grids, lines, gradients, and color blocks so you can check geometry and image processing quickly.
Refresh Rate Test
A refresh-rate visual test helps you confirm that motion looks smoother after switching to a higher display mode.
White Screen
A fullscreen white screen makes dark pixels, dust, smudges, and brightness falloff easier to see.
Black Screen
A fullscreen black screen helps reveal bright stuck pixels, light leakage, OLED behavior, and dark-room panel glow.
Red Screen
A pure red screen isolates the red channel so stuck subpixels, tint shifts, and color uniformity issues stand out.
Green Screen
A pure green screen stresses the green subpixel channel and makes channel-specific defects easier to spot.
Blue Screen
A pure blue screen isolates the blue channel and helps reveal defects that may hide on white or red patterns.
Featured checks
Start with the tests most people need first.
These six pages cover the highest-value inspection path for a new monitor: pixels, bleed, uniformity, tone setup, and motion behavior.
Dead Pixel Test
Run a fullscreen dead pixel test with solid black, white, red, green, and blue screens. Check a monitor, laptop, phone, or TV before you keep it.
Open testBacklight Bleed Test
Use a fullscreen black screen to check backlight bleed, corner glow, and uneven light leakage on LCD monitors, laptops, and TVs.
Open testScreen Uniformity Test
Check screen uniformity with white, gray, and color patterns. Find cloudy zones, tint shifts, dirty screen effect, and uneven brightness.
Open testBrightness Test
Use grayscale steps and black level patterns to check whether your monitor brightness keeps shadow and highlight detail visible.
Open testContrast Test
Check monitor contrast with black, white, and grayscale steps. Tune contrast without losing shadow or highlight detail.
Open testResponse Time Test
Use moving patterns to check monitor response time behavior, smearing, overshoot, and motion blur in a browser.
Open testHow it helps
A practical monitor test site, not a marketing page.
Tool first
The homepage opens with real patterns and controls, so a quick screen check can start immediately.
Focused checks
Each test page has its own use cases, FAQ, and related links for the specific display problem.
Visual patterns
Color fills, gradients, grids, text targets, and motion targets make the pages useful before any SEO content.
Clear caveats
The content separates visual browser checks from hardware measurement and warranty decisions.
Guides
Practical monitor testing guides
How to Check a Monitor for Dead Pixels
A reliable dead pixel check uses fullscreen solid colors, steady lighting, and a repeatable inspection path. The goal is to separate real panel defects from dust, reflections, scaling artifacts, and temporary cable issues.
How to Test a New Monitor
A new monitor should be tested before you mount it, remove packaging, or let the return window pass. Start with panel defects, then verify uniformity, tone, text clarity, refresh rate, and real content.
Monitor Calibration Guide
Browser tests can help you set a monitor to a sensible baseline and spot obvious problems. They do not replace a colorimeter, but they make brightness, contrast, gamma, sharpness, and banding easier to judge before hardware calibration.
Backlight Bleed vs IPS Glow
Backlight bleed and IPS glow both appear on dark screens, but they behave differently. Bleed is usually fixed in place, while IPS glow changes with viewing angle, seating position, brightness, and camera exposure.
Best Monitor Settings for Gaming
The best gaming monitor settings balance motion clarity, visibility, latency, and comfort. Confirm refresh rate first, then tune brightness, contrast, gamma, adaptive sync, and overdrive with real gameplay checks.
FAQ
Monitor test questions
What is MonitorTest.im?
MonitorTest.im is a browser-based display testing site with fullscreen patterns for pixels, backlight bleed, uniformity, brightness, contrast, gamma, text clarity, and motion.
Do I need to install anything?
No. The tests run in a modern browser. Fullscreen mode is recommended for the cleanest inspection.
Which monitor test should I run first?
Start with white, black, red, green, blue, and gray screens. That first sweep catches most dead pixels, stuck pixels, bright pixels, dust spots, and obvious uniformity issues.
How do I check for dead pixels?
Open a solid white screen to find dark dots, then use black, red, green, and blue screens to check bright pixels and subpixel defects. Inspect the whole panel, especially corners and edges.
What is the difference between a dead pixel and a stuck pixel?
A dead pixel usually stays dark or inactive. A stuck pixel often stays red, green, blue, or bright while nearby pixels change normally.
How do I test backlight bleed?
Use the black screen test in a dark room at your normal brightness. Look for fixed bright patches near edges or corners, then compare with real dark video or game content.
Why should I use a gray screen?
A mid-gray screen makes dirty screen effect, uneven brightness, color tinting, and panel uniformity problems easier to see than a pure white or black screen.
Can I test a phone, tablet, TV, or projector?
Yes. Open the site on the device or browser source you want to inspect, use fullscreen if available, and keep room lighting consistent while you compare patterns.
Why does fullscreen mode matter?
Fullscreen removes browser UI, bookmarks, and page chrome from the inspection area. It gives you cleaner solid colors and makes edge problems easier to judge.
Are online monitor tests accurate?
They are accurate for visual inspection of visible defects, brightness steps, contrast steps, gradients, and motion behavior. They do not measure exact color accuracy or luminance.
Can these tests replace professional calibration?
No. They are practical visual tests. For measured color accuracy, use a hardware colorimeter.
Is it safe to use these tests on OLED displays?
Yes for normal short inspection sessions. Avoid leaving any static high-brightness pattern on an OLED screen for a long time.
Why do photos exaggerate backlight bleed?
Phone cameras often raise exposure in dark scenes, so black screen glow can look worse in a photo than it does to your eyes. Judge the panel visually first.
What should I do if I find a problem?
Repeat the test after cleaning the screen, changing cables if relevant, and checking normal brightness. If the issue remains visible in daily use, record evidence and contact the seller or manufacturer.
Start with the fullscreen monitor test.
Run the solid color sweep first, then continue with targeted pages if you find a problem.