Screen Resolution Checker — What Is My Screen Resolution?

What is a Screen Resolution Checker?

A screen resolution checker (स्क्रीन रेज़ोल्यूशन चेकर) tells you how many pixels your screen has and how your device presents them to websites. You might need this to buy a matching wallpaper, design a website or presentation, report a display problem to support, check a second-hand laptop, set up a game, or simply satisfy curiosity about your new phone.

This free tool reads everything directly from your browser: your screen size in CSS pixels, the estimated physical resolution, the device pixel ratio (scaling), your browser's viewport, the aspect ratio, colour depth and touch support — and it can measure your refresh rate too.

Key Features

• Screen resolution as websites see it.
• Estimated physical resolution after scaling.
• Device pixel ratio and scaling percentage.
• Viewport and visual viewport for web design.
• Aspect ratio with familiar names.
• Refresh rate measurement and one-click copy.

How to Use It

1. Open the page — the values appear immediately.
2. Read the main resolution and the details table.
3. Press Measure refresh rate and keep the tab visible for a second or two.
4. Press Copy details to paste the full summary anywhere.

CSS Pixels vs Physical Pixels

Modern screens pack more pixels into the same space, so operating systems scale everything up to keep text readable. Websites then work in "CSS pixels", which may each cover several physical pixels. The ratio between them is the device pixel ratio (DPR).

The physical figure is an estimate based on the reported values; for unusual scaling settings it can differ from the panel's exact specification by a pixel or two.

Common Screen Resolutions

Aspect Ratio

Aspect ratio is the shape of the screen — width compared with height. Most TVs and many laptops are 16:9; many newer laptops use the taller 16:10 or 3:2, which show more of a document; ultrawide gaming monitors are 21:9; and modern phones are tall, around 9:19.5 or 9:20 in portrait. The checker reduces your dimensions to the nearest common ratio and names it. Knowing it helps when choosing wallpapers, editing videos or designing slides.

Viewport: What Websites Actually Get

The viewport is the part of the browser window where the page is drawn — the screen minus tabs, address bar, bookmarks bar and any side panels. Responsive websites change their layout based on the viewport width, so developers and designers use it to test breakpoints. On phones, the visual viewport is the area visible after pinch-zooming; it shrinks when you zoom in. Resize the window and watch the numbers update live.

Refresh Rate

The refresh rate is how many times per second the screen updates the image, measured in hertz (Hz). 60 Hz is standard; 90 and 120 Hz phones and 120–240 Hz gaming monitors feel noticeably smoother when scrolling and in games. The checker measures it by timing the browser's animation frames for about 90 frames and rounding to the nearest common rate. If the result is lower than your screen's advertised rate, check:

• Display settings — Windows: Settings → Display → Advanced display → Choose a refresh rate; macOS: System Settings → Displays.
• Battery saver or power-saving modes, which often cap the rate.
• Cables and ports — older HDMI cables may not support high rates at high resolutions.
• Browser limits — some browsers reduce animation rates in the background or on battery.

Colour Depth and Touch

Colour depth is reported in bits per pixel; 24-bit (16.7 million colours) is normal for most displays, while higher values appear on HDR or wide-colour setups. Touch points show whether your device supports touch and how many fingers it can track at once — 0 means no touch screen, 5 or 10 is typical for phones, tablets and touch laptops.

When You'll Need This

• Downloading wallpapers in the exact size of your screen.
• Web and app design — testing layouts at real viewport sizes.
• Tech support — sharing accurate display details.
• Buying a used laptop or monitor — confirming the advertised resolution and refresh rate.
• Gaming — choosing the right in-game resolution and checking high-refresh setups.
• Presentations and videos — matching the shape of the screen you'll present on.
• Screen recording — choosing a recording size that matches your display for sharp results.

Screen Size vs Resolution vs PPI

People often mix up three different things. Screen size is the diagonal in inches, like a 15.6-inch laptop. Resolution is the number of pixels, like 1920 × 1080. Pixel density (PPI) combines the two: how many pixels fit in each inch. A 15.6-inch Full HD laptop has about 141 PPI, while a 6.5-inch phone with a similar number of pixels exceeds 400 PPI, which is why phone text looks so crisp. Browsers cannot measure the physical size of your screen, so this tool reports resolution and pixel ratio rather than inches.

For Web Designers and Developers

When testing a website, the numbers that matter most are the viewport width (which triggers your CSS breakpoints) and the device pixel ratio (which decides whether images look sharp). Serve images at least DPR × their displayed CSS size — a 400-pixel-wide image slot on a DPR 2 screen needs an 800-pixel image to look crisp. Use responsive images with srcset so phones don't download desktop-sized files. Resize the browser window while watching this page to see exactly when the viewport crosses your breakpoints, and use the copy button to record the details of a device that shows a bug.

Phones and Tablets

On phones the reported resolution is usually small — around 360–430 CSS pixels wide — with a high device pixel ratio, so the physical resolution is much larger. Rotating the phone swaps width and height, and the page updates automatically. Tablets in landscape often report around 1024–1366 CSS pixels wide, close to small laptops, which is why many websites show their desktop layout on tablets.

Privacy

All values come from standard browser features and are calculated on this page. Nothing is sent to any server or stored. Reload the page any time for fresh readings. Because no information leaves your device, it's safe to use on office and school computers too — and the copied summary contains only display details, nothing personal.

Common Mistakes

• Reading CSS pixels as the panel resolution — check the physical pixels figure.
• Leaving browser zoom on, which changes the numbers.
• Measuring refresh rate with the tab in the background, which slows animation frames.
• Checking the wrong monitor — move the window to the screen you care about.
• Confusing screen size with resolution — inches and pixels are different measurements.

Quick Glossary

• Resolution: width × height in pixels.
• DPR: device pixel ratio — physical pixels per CSS pixel.
• Viewport: the area of the browser window where pages are drawn.
• Hz: refreshes per second.
• PPI: pixels per inch — how sharp a screen looks.
• Breakpoint: a viewport width where a website changes its layout.

Why Use This Checker?

It explains not just one number but the full picture — scaling, physical pixels, viewport, shape and refresh rate — in plain language, updates live and copies a neat summary for support or design work. It's free, instant and private. Testing other hardware? Try our Keyboard Tester and Webcam & Mic Test.

Screen Resolution Checker — Key Facts

Frequently Asked Questions

Explore More Prompt Minds Tools

Screen Resolution Checker works great alongside our other free tools. Every Prompt Minds tool runs entirely in your browser — no sign-up, no uploads, no watermarks. Browse all free tools.