Screen Resolution Tester Online Free

Check your screen resolution, viewport size and device pixel ratio

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Current viewport size

xs (mobile)

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Screen Resolution

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Viewport Size

Device Pixel Ratio

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Physical Resolution

Portrait

Orientation

xs (mobile)

Breakpoint

Tailwind CSS Breakpoints

xs (mobile)0px – 639px

sm (small)640px – 767px

md (tablet)768px – 1023px

lg (laptop)1024px – 1279px

xl (desktop)1280px – 1535px

2xl (wide)1536px+

Screen Resolution Tester Online Free - Check Display Size

Check your screen resolution, viewport size, device pixel ratio, and current Tailwind CSS breakpoint online free. All values update in real-time as you resize the browser window. Shows physical screen resolution, CSS viewport dimensions, device pixel ratio (DPR), physical resolution calculation, orientation, and the active Tailwind CSS breakpoint. Essential for web developers testing responsive designs and understanding display characteristics.

Key Features

Physical screen resolution (width × height)

CSS viewport size (browser window)

Device pixel ratio (DPR) for retina displays

Physical resolution calculation (screen × DPR)

Current Tailwind CSS breakpoint indicator

Orientation detection (landscape/portrait)

Real-time updates on window resize

Device type icon (mobile/tablet/desktop)

Free, no registration required

Why Check Screen Resolution?

Web developers need to know the viewport size to test responsive designs at different breakpoints. The device pixel ratio helps understand retina and HiDPI displays — a DPR of 2 means images need to be 2x the CSS size to look sharp. Knowing the current Tailwind CSS breakpoint helps debug responsive layout issues without opening DevTools. This tool gives you all display information at a glance, updating in real-time as you resize the window.

Benefits

•Debug responsive design issues at specific breakpoints
•Test layouts at different viewport sizes
•Understand retina display scaling for image optimization
•Verify media query behavior in real-time
•Check orientation for mobile-first design
•Identify the active Tailwind CSS breakpoint instantly

How to Use the Screen Resolution Tester

1Open the tool on any device to see your current display info
2View screen resolution, viewport size, and DPR
3Resize the browser window to see values update in real-time
4Check which Tailwind CSS breakpoint is currently active
5The device icon changes between mobile, tablet, and desktop
6Use browser DevTools device emulation for specific device testing

Common Screen Resolutions Reference

Mobile: 375×667 (iPhone SE), 390×844 (iPhone 14), 360×800 (Android). Tablet: 768×1024 (iPad), 820×1180 (iPad Air). Laptop: 1280×800, 1366×768, 1440×900. Desktop: 1920×1080 (Full HD), 2560×1440 (2K), 3840×2160 (4K). Retina MacBook: 2560×1600 (DPR 2). The most common viewport width for web design is 1440px for desktop and 375px for mobile.

Frequently Asked Questions

What is the difference between screen resolution and viewport size?

Screen resolution is the physical pixel count of your display. Viewport size is the CSS pixel area available to the browser, which may differ due to browser chrome (address bar, etc.) and device pixel ratio.

What is device pixel ratio?

DPR is the ratio of physical pixels to CSS pixels. A DPR of 2 (retina) means 4 physical pixels per CSS pixel, resulting in sharper images.

Why does my viewport change when I scroll?

On mobile browsers, the viewport height changes when the address bar hides/shows on scroll. This is a known browser behavior.

What are Tailwind CSS breakpoints?

Tailwind uses: sm (640px), md (768px), lg (1024px), xl (1280px), 2xl (1536px). The tool shows which breakpoint is currently active.

How do I test a specific screen size?

Resize your browser window to the desired width. The values update in real-time. You can also use browser DevTools device emulation.

Related Keywords

screen resolution checkerviewport size testerdevice pixel ratioresponsive design testerbreakpoint checkerdisplay resolution onlinescreen size detectortailwind breakpoint checker

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