The Screen Resolution Checker instantly detects your display’s resolution, browser viewport size, aspect ratio, and pixel density. It’s a quick way to answer “what is my screen resolution?” and to grab the numbers developers and designers need.
How to check your screen resolution
- Open the tool — it detects your screen automatically.
- Read your screen resolution, viewport size, aspect ratio, and pixel ratio.
- Resize your browser to see the viewport values update live.
Screen resolution vs viewport size
Screen resolution is the total number of pixels on your display, while the viewport is the visible area inside the browser window. They differ because of browser chrome, zoom, and device pixel ratio — this tool shows both.
Frequently Asked Questions
What is my screen resolution?
The tool reads your display and shows its resolution in pixels (for example 1920×1080) automatically.
What is the difference between resolution and viewport?
Resolution is your full screen size in pixels; the viewport is the visible web page area, which is usually smaller.
What is device pixel ratio?
It’s the ratio of physical pixels to CSS pixels. On high-density (retina) screens it’s 2 or more, which is why images need higher resolution to look sharp.
Is the screen resolution tool free?
Yes, it’s free and detects everything locally in your browser.