Check your screen resolution, viewport size and device pixel ratio
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Current viewport size
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Screen Resolution
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Viewport Size
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Device Pixel Ratio
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Estimated Physical Pixels
Portrait
Orientation
xs (mobile)
Breakpoint
Tailwind CSS Breakpoints
Check your screen resolution, viewport size, device pixel ratio, orientation, estimated physical pixel count, and current Tailwind CSS breakpoint online free. Values update in real time as you resize the browser window. The tool helps web developers, QA testers, and designers understand CSS viewport dimensions, responsive breakpoints, device pixel ratio, and layout behavior without opening a full testing dashboard.
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.
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.
Viewport size is the CSS pixel area available to the browser page. Device resolution and screen values may be affected by operating system scaling, browser UI, zoom level, and device pixel ratio. For responsive design, viewport width is usually the most important value because CSS media queries respond to CSS pixels rather than raw hardware pixels.
Use this tool to quickly identify your current breakpoint, then resize the browser or use DevTools device emulation to test important widths. Check mobile, tablet, laptop, desktop, and wide layouts. Pay attention to navigation wrapping, card grids, image crops, sticky elements, and text overflow at each breakpoint.
Screen Resolution Tester Online Free is useful when you need to complete a focused task quickly without installing desktop software, creating another account, or switching into a heavy workflow. It works well for quick checks, conversions, previews, cleanups, generation tasks, and everyday operations where speed and consistency matter. Check your screen resolution, viewport size, device pixel ratio, orientation, estimated physical pixel count, and current Tailwind CSS breakpoint online free. Values update in real time as you resize the browser window. The tool helps web developers, QA testers, and designers understand CSS viewport dimensions, responsive breakpoints, device pixel ratio, and layout behavior without opening a full testing dashboard.
Start with a small sample so you understand how Screen Resolution Tester Online Free handles your input, then apply it to the full task. Review the important fields, copy or export the result, and test it in the place where you plan to use it. This keeps the tool fast while still giving you a practical quality-control step before production use.
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.
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.
On mobile browsers, the viewport height changes when the address bar hides/shows on scroll. This is a known browser behavior.
Tailwind uses: sm (640px), md (768px), lg (1024px), xl (1280px), 2xl (1536px). The tool shows which breakpoint is currently active.
Resize your browser window to the desired width. The values update in real-time. You can also use browser DevTools device emulation.
Yes. Screen Resolution Tester Online Free is designed as a free browser-based utility for quick personal, learning, and professional workflows.
No. You can use Screen Resolution Tester Online Free directly in a modern browser such as Chrome, Edge, Safari, or Firefox.
Yes. The page is responsive and can be used on phones and tablets, although desktop is usually more comfortable for long input or repeated copy operations.
Use clean input, test with a small sample first, review the output carefully, and adjust any details that depend on your final use case.
In most cases, yes. You can use the generated or processed output in personal and commercial projects, but legal, financial, medical, or security-sensitive work should still be reviewed by a qualified person.
The tool is built for quick browser workflows. You should still avoid entering highly sensitive data unless the specific tool clearly states how the data is handled.
Many tools include copy or download actions. If a dedicated export is not available, you can usually copy the visible result manually.
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Tạo file .env và .env.example cho dự án.
Tạo .gitignore cho Node.js, Python, Java.
Tạo mock JSON data cho API testing.
Format và phân tích API response.
Test REST API: GET, POST, PUT, DELETE.
Giải thích regex, flags, capture group và cảnh báo pattern dễ lỗi.
Tạo OpenAPI JSON/YAML với params, auth và request body.
Chuyển đổi Binary, Hex, Base32.
Mã hóa/giải mã Base64.
Chuyển đổi Decimal, Binary, Hex.
Tạo CSS box-shadow trực quan.
Tính quyền file Linux.
