Free Screen Tools
9 free browser tools to calculate, test, and work with screen colors. No uploads, signups, or installs.
Calculate
Calculate pixel density, physical screen size, aspect ratio, and CSS pixel conversions.
Test
Inspect displays for dead pixels and look up detailed device screen specifications.
Color
Pick, convert, and validate colors for accessible screen interfaces.
Physical measurement (Screen Ruler)
Open calibrated rulers, a protractor, and printable rulers on Screen Ruler.
Tools for everyone who works with screens
ScreenTools is a collection of nine free browser-based utilities for designers, developers, and anyone who spends time measuring, testing, or planning around screens. Three sister-site partners for screen ruler, online protractor, and printable ruler PDF workflows are linked from the home grid. No accounts. No subscriptions. No installs.
Calculate pixel densities, aspect ratios, screen diagonals, or convert between CSS units. Test your display for dead pixels and look up exact specs for modern phones, tablets, laptops, monitors, and TVs. For measurement and print workflows, go to screenruler.online.
Each tool is fast and privacy-conscious: calculations run locally in your browser, and your inputs are not stored on our servers.