🔒 Runs in your browser — nothing is uploaded✓ Free, no signup
What Is My Screen Resolution?
Your screen resolution, browser viewport and device pixel ratio — measured instantly and updated live as you resize the window.
When should you use the Screen Resolution Checker?
- Checking your display size for a bug report or support ticket
- Testing responsive layouts and breakpoints
- Finding the device pixel ratio for retina images
How to use the Screen Resolution Checker
- 1
Open the page
Your screen and viewport sizes appear immediately.
- 2
Resize the window
The viewport size updates live, which helps when testing breakpoints.
- 3
Check the details
Pixel ratio, available area, colour depth and display features are listed.
- 4
Copy all
Copy every value in one go for a bug report.
Examples
A typical laptop
Display
13-inch laptop at default scaling
Result
Screen 1440 × 900 Physical 2880 × 1800 Pixel ratio 2
Common errors and how to fix them
The resolution is lower than my monitor's- Browsers report CSS pixels. With display scaling (like 150%) or a retina screen, the physical resolution is the CSS size × device pixel ratio.
The numbers change when I zoom- Browser zoom changes CSS pixel sizes. Reset zoom with Ctrl/⌘ + 0.
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Screen Resolution Checker FAQ
Screen resolution is the whole display. The viewport is the area inside the browser window where the page is drawn — that's what CSS media queries use.
How many physical pixels make up one CSS pixel. Retina and most phone screens are 2 or 3.
With 200% display scaling, the browser reports CSS pixels: 1920 × 1080 at a pixel ratio of 2 equals 3840 × 2160 physical pixels.
The screen minus permanent system UI like the Windows taskbar or macOS menu bar and Dock.
No. Everything is read and shown in your browser — nothing is sent or stored.
No. Everything runs in your browser, so your data never leaves your device.