All tests
Every test on this site, what it checks, and which one to run first.
Tests
Frame rate and motion
If games or scrolling feel choppy, start with the FPS test. When it stops at 60 on a faster monitor, the refresh rate test shows whether the screen itself runs at 60 and which setting to change. Trails or bright halos behind moving shapes are the ghosting test’s job: run it, then step through your monitor’s overdrive settings. To see what a faster screen would change, the frame rate comparisons play 30 to 360 fps side by side.
- FPS test
Frames per second on your screen, dropped frames and 1% lows.
- Refresh rate test
Your screen's Hz to two decimals, and what to change when it shows 60.
- Ghosting test
Moving shapes that show ghosting, overshoot and motion blur.
Pixels and panel
Check a new monitor while you can still send it back. The monitor test steps through 13 full-screen patterns, and when one of them shows a fault, the test for that fault looks closer. Dead and stuck pixels show on solid colors, burn-in on flat gray, mostly on OLED screens, and backlight bleed on black in a dark room.
- Monitor test
13 full-screen patterns: pixels, black level, gamma and uniformity.
- Dead pixel test
Solid full-screen colors that show dead, stuck and hot pixels.
- Burn-in test
Flat gray and color fields that show burn-in and image retention.
- Backlight bleed test
A full black screen that shows light leaking at the edges of an LCD.
Color and HDR
Visible steps in a sky or a dark gradient are banding, and they show most in dark shades; a 10-bit signal smooths them if your monitor accepts one. The HDR test shows whether your screen is in HDR mode at all and, in Chrome and Edge, how far above normal white it goes.
- Color banding test
Gray and color gradients, plain and dithered, to spot banding.
- HDR test
What your browser reports about HDR, and brighter-than-white highlights in Chrome and Edge.
Size and load
Screen resolution shows how many pixels your screen has and how much Windows or macOS scales them up. The PPI calculator turns resolution and screen size into pixel density, so you can compare two monitors before you buy. The GPU stress test puts your graphics card under load, so you can watch whether the frame rate holds.
- Screen resolution
Your screen's resolution, pixel ratio and scaling, updated as you resize.
- PPI calculator
Pixel density, pixel size and screen size from resolution and diagonal.
- GPU stress test
Load your graphics card or CPU and watch frame rate and frame time.
Setup
Before a timing test
Every test runs in your browser. Keep its tab in front and the window on the screen you plan to measure: browsers pause pages in background tabs. On battery, Chrome’s Energy Saver can hold a page to 30 frames per second. Plug a laptop in first.
Before a pattern test
Go full screen at your normal brightness, in a dim room: backlight bleed and near-black faults disappear in daylight. Wipe the screen first, since a speck of dust can pass for a stuck pixel.