Know Your
Screen Size
Instantly detect resolution, pixel density, aspect ratio,
and device type — no installs, no sign-up.
Screen Analyzer
Every metric about your display, calculated in real time.
Viewport Ruler
Drag or resize your window to see live measurements update.
Breakpoint Tester
See which CSS media query breakpoints your device matches right now.
Display Capabilities
Advanced display features and color space support detected from your hardware.
Screen Size Comparison
See how common screen sizes compare. Your screen is highlighted.
How It Works
Zero servers. Zero tracking. All detection runs locally in your browser.
Browser API Access
We query the browser's native screen, window, and navigator APIs — no permissions needed, no data sent anywhere.
Real-time Calculation
Aspect ratios, pixel density, physical dimensions, and breakpoints are calculated on the fly using mathematical formulas.
Live Updates
Resize your window, rotate your device, or change resolution — all values update instantly via event listeners.
Private by Design
Everything stays on your device. No analytics, no fingerprinting, no cookies. Your data never leaves your browser.
Frequently Asked Questions
Everything You Need
A complete suite of display diagnostics, all in one page.
Instant Detection
Results appear the moment you load the page. No button clicks required.
Physical Size Calc
Enter your diagonal screen size and we calculate exact physical width, height, and PPI.
All Devices
Works on laptops, phones, tablets, desktops, TVs, and any web-enabled display.
Color Space
Detects HDR, P3 wide gamut, sRGB, and other color capabilities your monitor supports.
Live Ruler
Interactive pixel ruler that updates in real time as you resize your browser.
Breakpoint Map
Visual grid showing all CSS breakpoints and which one your device currently hits.
100% Private
No tracking, no cookies, no data collection. Everything runs locally in your browser.
Copy & Share
Copy your complete screen stats to clipboard in one click for easy sharing.