Display Tests
Check your screen for dead pixels, backlight bleed, uniformity issues, and color accuracy.
Dead Pixel Test
Run a free dead pixel test in fullscreen. Check monitors, laptops, phones, tablets, and TVs for dead or stuck pixels using solid color screens.
Black Screen
Display a full black screen to check for stuck pixels, backlight bleed, screen uniformity, and OLED burn-in. Works on monitors, TVs, phones, and tablets.
White Screen
Display a full white screen to find dead pixels, check screen brightness uniformity, and clean your display. Works on all devices.
Red Screen
Display a full red screen to detect stuck sub-pixels and check color uniformity on monitors, TVs, and phones.
Green Screen
Display a full green screen to detect stuck sub-pixels and check green color uniformity on your display.
Blue Screen
Display a full blue screen to detect stuck sub-pixels and check blue color uniformity on your display.
Screen Color Test
Cycle through solid colors to test your monitor, TV, or phone for dead pixels, stuck pixels, and color accuracy. Free fullscreen tool.
Backlight Bleed Test
Use a fullscreen black screen to check your monitor, laptop, or TV for backlight bleed, edge glow, clouding, and screen uniformity issues.
Screen Uniformity Test
Test your display for uniformity issues including clouding, dirty screen effect, tinting, and banding using gray and white test screens.
Refresh Rate Test
Measure your display's refresh rate in Hz using your browser. Check if your monitor is running at 60Hz, 120Hz, 144Hz, 240Hz, or higher.
Gradient Banding Test
Test your monitor, TV, or phone for gradient banding and color stepping artifacts using smooth color gradients.
Monitor Ghosting Test
Test your monitor for ghosting and slow response time. See if fast-moving objects leave visible trails.
Motion Blur Test
Test your display for motion blur with moving stripe patterns. Check if fast motion appears sharp or blurry.
OLED Burn-In Test
Check your OLED screen for burn-in and image retention. Display solid colors to reveal permanent ghost images.
Image Retention Test
Test your display for temporary image retention. Display a pattern and check if it leaves a ghost on a gray background.
HDR Test
Check if your display supports HDR (High Dynamic Range) and its color gamut. Test shadow and highlight detail.
Gamma Test
Test your monitor gamma calibration with a grayscale step chart. Check if your display shows accurate brightness levels.
Contrast Test
Test your display contrast with near-black and near-white steps. Check if your monitor clips shadow or highlight detail.
Viewing Angle Test
Test your display viewing angles with a color grid. Check if colors shift when viewed from the side, above, or below.
Stuck Pixel Test
Test your screen for stuck pixels — pixels stuck on red, green, or blue. Cycle through solid colors to find and identify stuck subpixels.
Screen Burn-In Test
Check your monitor, TV, or phone screen for burn-in damage. Display solid colors to reveal permanent ghost images from static content.
IPS Glow Test
Test your IPS monitor for glow — the warm light visible in corners when viewing dark content at an angle. Compare IPS glow vs backlight bleed.
Dirty Screen Effect Test
Test your monitor or TV for dirty screen effect (DSE) — uneven patches visible on uniform gray or colored backgrounds.
Vertical Banding Test
Test your display for vertical banding — visible vertical lines or stripes on uniform backgrounds caused by panel defects.
144Hz Test
Verify your monitor is actually running at 144Hz. Test if your refresh rate is correctly set and your display is using its full speed.
240Hz Test
Verify your monitor is running at its full 240Hz refresh rate. Confirm your display, cable, and GPU support 240Hz output.
Response Time Test
Test your monitor response time visually. Check for ghosting, smearing, and overshoot caused by slow pixel transitions.
Device Info
Screen Resolution
Instantly check your screen resolution, viewport size, device pixel ratio, and estimated DPI. Works on monitors, laptops, phones, and tablets.
Screen Size Checker
Check your screen size, resolution, viewport dimensions, and device pixel ratio instantly in your browser.
Viewport Size Checker
Check your browser viewport width and height in pixels. Useful for web developers testing responsive designs.
DPI Checker
Check your screen's DPI (dots per inch) and pixel density. See your device pixel ratio and estimated PPI.
Related Guides
IPS Glow vs Backlight Bleed
Learn how to tell the difference between IPS glow and backlight bleed on your monitor.
How to Test Backlight Bleed
Step-by-step guide to checking your monitor for backlight bleed issues.
How to Check for Dead Pixels
Find dead and stuck pixels on any screen using solid color tests.