Free online Screen Resolution Detector
Our Screen Resolution Detector tool is completely free and works directly in your browser. Detect your screen resolution, viewport, pixel ratio and orientation in one click. No signup required, no data sent to any server.
How to use this tool?
Simply fill in the fields above and the result appears instantly. Our screen resolution detector supports resolution, screen, viewport, pixel ratio. The tool is optimized for both mobile and desktop.
Why use SmartGap Tools?
SmartGap Tools offers over 30 free online tools. Also check out: My User Agent, My IP Address. All our tools are fast, free and privacy-friendly.
What is screen resolution?
Screen resolution is the number of pixels displayed horizontally and vertically on your monitor. A resolution of 1920 x 1080 means 1,920 columns by 1,080 rows of pixels. Our resolution detector reads this value directly from your browser and also displays your viewport size, device pixel ratio and color depth.
Common screen resolutions
- 1920 x 1080 (Full HD): the standard for most desktop monitors and laptops.
- 2560 x 1440 (QHD): popular among gamers and creative professionals.
- 3840 x 2160 (4K UHD): four times Full HD, ideal for video editing and large displays.
Screen size vs viewport size
The screen resolution is the total number of physical pixels on your display. The viewport is the visible area inside your browser window, which is smaller because of toolbars, scrollbars and OS taskbars. Web developers use viewport size to build responsive layouts.
Frequently Asked Questions
How does this screen resolution detector work?
The tool reads your display properties directly from the browser API. It detects your screen resolution, viewport size, device pixel ratio, color depth and orientation in real time.
What is the difference between screen resolution and viewport size?
Screen resolution is the total number of physical pixels on your display. Viewport size is the visible area inside your browser window, which is smaller due to toolbars and system taskbars.
Can I use this to test my monitor resolution?
Yes, open this page on any device to see its screen resolution instantly. It works on desktop monitors, laptops, tablets and phones.
What is device pixel ratio (DPR)?
DPR indicates how many physical pixels correspond to one CSS pixel. A DPR of 2 means a Retina-type display where each CSS pixel maps to a 2x2 grid of physical pixels.
Is this screen resolution tool free?
Yes, it is completely free, requires no download, and works in any modern browser. Results update automatically if you resize your window.