What Is My Screen Resolution?
Screen Resolution Checker instantly detects your screen resolution and shows your display in physical pixels the moment the page loads. It also reads your browser viewport, device pixel ratio, color depth, and aspect ratio, so you get a complete picture of your display without opening any system settings.
It is built for web developers testing responsive layouts, designers checking how artwork renders at different sizes, gamers tuning display settings, and anyone curious about exactly what their monitor or phone is doing. Switch between a Common Resolutions reference and a Breakpoints view to compare your screen against standard devices and CSS breakpoints in real time.
How to Use the Screen Resolution Checker
Read your screen and viewport
The page detects everything automatically. Screen Resolution shows your monitor's native pixels, and Browser Viewport shows the current size of your browser's content area.
Check the detailed stats
Below the main display you will find Total Pixels in megapixels, Device Pixel Ratio, Color Depth, and Aspect Ratio. Tap the info icon on any card for a short explanation.
Compare with references
Switch to Common Resolutions to match your screen against desktop, laptop, tablet, and mobile standards, or to Breakpoints to see which CSS breakpoint your viewport falls into. Matching entries are highlighted.
Copy your screen info
Click Copy Info or press Ctrl+C (Cmd+C on Mac) to copy every detail to your clipboard, ready to paste into a bug report or test note.
Features
Real-Time Detection
Every value updates instantly when you resize the window, change display scaling, or rotate your device.
Visual Device Representation
An on-screen frame switches between desktop, laptop, tablet, and mobile to match your current viewport.
Display Scaling Detection
When your OS scales the display, it shows both native and scaled resolution plus the exact scaling percentage.
Reference Comparisons
Compare your screen with common desktop, laptop, tablet, and mobile resolutions, with matches highlighted.
CSS Breakpoint Indicator
See which Bootstrap 5 breakpoint (XS, SM, MD, LG, XL, 2XL) your viewport currently lands in.
One-Click Copy
Copy native resolution, viewport, pixel count, DPR, color depth, aspect ratio, device type, and breakpoint in one click.
Frequently Asked Questions
What is my screen resolution?
Your screen resolution is the number of physical pixels your display can show, written as width by height (for example, 1920 × 1080). This tool detects it automatically and shows it in the Screen Resolution card the moment the page opens.
How do I check my screen resolution in a browser?
Just open this page. It reads your resolution straight from the browser using JavaScript, so there is nothing to install or configure. It works the same way on desktop, laptop, tablet, and phone browsers.
What does a resolution like 1920x1080 mean?
It means the display is 1920 pixels wide and 1080 pixels tall, which is Full HD. More pixels generally means a sharper image. The tool labels common resolutions for you, such as HD, Full HD, QHD, 4K UHD, 5K, and 8K UHD, and shows the total in megapixels.
What is the difference between screen resolution and viewport size?
Screen resolution is your monitor's full pixel count. The browser viewport is the smaller visible area where web content is drawn, since it excludes the browser's toolbars and the operating system taskbar. The viewport changes when you resize the window; your screen resolution does not.
Why is my resolution different from my monitor's specs?
This is almost always display scaling. Modern systems scale high-DPI screens to make text larger, so a 4K monitor at 150% scaling reports an effective resolution of 2560 × 1440 while its native resolution stays 3840 × 2160. The tool shows both values plus the scaling percentage.
What is Device Pixel Ratio (DPR)?
Device Pixel Ratio is how many physical pixels make up one CSS pixel. A DPR of 2x, common on Retina and other HiDPI displays, means four physical pixels (2 × 2) render each CSS pixel, giving sharper text and images. A higher DPR indicates a denser screen.
How do CSS breakpoints work here?
CSS breakpoints are viewport widths where a responsive layout changes. The Breakpoints view uses Bootstrap 5 ranges — XS (below 576px), SM, MD, LG, XL, and 2XL (1400px and up) — and highlights the one your viewport is in, which is handy for testing responsive designs.
Is my screen information sent to any server?
No. All detection runs entirely in your browser with JavaScript. Your resolution, viewport, and device details are never transmitted to our servers or any third party, so your privacy stays fully intact.
Can I use this on a phone or tablet?
Yes. It works on any device with a modern browser. On phones and tablets you can rotate the device to watch the viewport dimensions, orientation, and aspect ratio update live.
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