Screen Resolution Checker — Free Online Tool
See your screen, viewport, pixel ratio, and color depth in real time.
—Screen Resolution
—Available Screen
—Viewport Size
—Pixel Ratio
—Color Depth
—Orientation
💡 Resize your browser window — the viewport values update automatically.
About Screen Resolution Checker
The Screen Resolution Checker instantly reports your display and browser dimensions, including full screen resolution, available screen area, current viewport size, device pixel ratio, color depth, and orientation. It is a quick reference for designers, developers, and anyone troubleshooting how a page looks on their device.
The viewport values update live as you resize the window, which makes it easy to test responsive breakpoints without extra tools. Everything is read directly from your browser, so the numbers reflect exactly what your current device reports.
How to Use Screen Resolution Checker
- Open the page to see your screen and viewport details immediately.
- Resize your browser window to watch the viewport values change.
- Compare screen resolution against the available screen area.
- Note the pixel ratio and color depth for design work.
Key Features
Shows full screen and available screen dimensions
Live viewport size that updates on resize
Reports device pixel ratio and color depth
Detects portrait or landscape orientation
Reads values directly from your browser
Frequently Asked Questions
What is the difference between screen resolution and viewport size?
Screen resolution is the total size of your display, while the viewport is the visible area inside the browser window, which is smaller because of toolbars and borders.
What does device pixel ratio mean?
It is the ratio of physical pixels to CSS pixels. A value above one indicates a high-density display such as a Retina screen.
Why does the viewport change when I resize?
The viewport reflects the current browser window size, so it updates in real time as you make the window larger or smaller.
Is any of this information collected?
No. All values are read locally in your browser and are not sent anywhere or stored.