Test your screen.
Know what you see.
A strange pixel. A blurry trail. A screen that just looks off. Use free test patterns to see what is happening, then find the next sensible step.
Start here
What are you trying to find out?
Most display problems have a standard order of checks. Pick the situation that matches yours and follow the tools and guides that belong together.
I just bought a monitor
Check for dead pixels, backlight bleed and uniformity problems while you can still return it.
My screen looks wrong
Blurry text, flickering or washed-out color. Work through the usual causes before blaming the panel.
I want faster gaming
Check browser refresh timing, compare overdrive settings, and look for frame skipping.
I have an OLED
Check for retained outlines and learn when to let the panel rest or use its built-in care routine.
Every test your display needs
From dead pixel detection to OLED burn-in analysis. Browse by category, or see all 50+ tools.
Pixel & defects
Find dead pixels, stuck sub-pixels, backlight bleed and uniformity problems before your return window closes.
Color & calibration
Compare reference colours, gamma patterns and white balance. For measured accuracy, use a calibration instrument.
Motion & performance
Compare visible trails, estimate browser refresh cadence, and learn which motion settings work for your screen.
OLED care
Inspect uniform fields for retained outlines. Follow your manufacturer’s care routine; browser patterns cannot repair OLED wear.
Precision & detail
Fine patterns that expose sharpness, sub-pixel rendering and text clarity problems at native resolution.
Fullscreen color screens
Solid color fills for spotting defects, cleaning guides, and light-leak checks.
Pick a test
Choose from 50+ diagnostic tools built for LCD, OLED and HDR displays.
Go fullscreen
Run it fullscreen so nothing but the test pattern is on your panel.
Read the result
Every tool explains what you are looking at and what counts as normal.
From the blog
Guides and deep dives into display technology.
Free & browser-based
Ready to test your display?
Every tool runs entirely in your browser. No installs, no accounts, no catch. Works on phones, laptops, and ultra-wide monitors alike.