Monitor Test Tools: The Complete Free Online Toolkit
Everything a screen can get wrong fits into a handful of checks: pixel defects, backlight faults, tone-response errors, motion artifacts and sharpness problems. This page collects every free browser test for those faults in one directory — open a tool, press F for fullscreen, and judge the result with your own eyes. Nothing to install, nothing to pay.
Pick the right test for the symptom
Start from what you noticed. Specks or colored dots that never move point to pixel defects; glowing corners or blotchy edges on dark scenes mean backlight bleed; washed-out or banded dark scenes call for the grayscale and gamma checks; smearing behind fast motion is a job for the ghosting test; fuzzy text asks for text clarity and a resolution sanity check.
If you have no specific complaint, run the all-in-one screen test first — its solid colors, bars and gradients surface the majority of panel faults in under two minutes. New monitor or second-hand purchase? Add the dead pixel, uniformity and HDR pages before the return window closes, and keep the burn-in page bookmarked if the panel is OLED.
How the toolkit works
Every tool renders its test patterns directly in the browser at your display's native resolution — press F to enter fullscreen so browser chrome does not cover the panel edges. Most tests are judgment calls you make by eye against reference patches; the guides on each page tell you exactly what a healthy result looks like and which monitor settings to change when it does not.
The toolkit also includes utilities that read your display instead of testing it: monitor info reports live resolution, scaling and measured refresh rate, and the PPI calculator computes pixel density for any diagonal and resolution. For photographers and video calls, the solid color screens double as instant lighting backdrops and camera white references.
Frequently Asked Questions
Are all these monitor test tools really free?+
Yes. Every test on this site runs locally in your browser — there is no download, no account and no watermark. Press F to enter fullscreen for accurate results.
Which test should I run first on a new monitor?+
Start with the all-in-one screen test, then run the dead pixel test, the backlight bleed test and the grayscale page. Together they cover the faults most likely to justify a warranty exchange, and they take about five minutes.
Can these tests damage my screen?+
No. The patterns are ordinary static images your display can render indefinitely — with one caveat: the pixel fixer intentionally exercises the panel at full intensity, so OLED owners should keep sessions short and avoid running it for hours.
Do the tests work on TVs, laptops and phones?+
Yes. Open the site in any modern browser on the device you want to check. On TVs, use the browser built into the TV or cast a tab from a laptop; press F or use the fullscreen button so the pattern covers the whole screen.