Test Your PC Hardware
Right in Your Browser
Keyboard tester, reaction time test, aspect ratio calculator, dead pixel test and more. All free, all instant, no installation needed.
Featured Tools
Reaction Time Test
How fast are your reflexes? Click when the screen turns green and get your reaction time in milliseconds.
Open tool →Keyboard Tester
Press every key to test for ghosting, N-key rollover, and mechanical switch actuation.
Open tool →Aspect Ratio Calculator
Calculate the perfect aspect ratio for any resolution, monitor, or custom crop size.
Open tool →All Tools
Click any tool to open it instantly — no download needed.
Keyboard & Mouse
Calculators
Why UltimatePCTools?
Every tool runs entirely in your browser — nothing is installed, nothing is tracked.
Instant Results
Tools run entirely in your browser memory. Zero latency between action and result.
No Account Required
Jump straight to testing. We never ask for your email or personal data.
Works Anywhere
Compatible with all modern browsers across Windows, Mac, Linux, iOS, and Android.