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Free Screen Resolution Checker – Detect Display Size, Viewport & Pixel Ratio
Check screen resolution, viewport size, device pixel ratio, and browser dimensions instantly. Updates live on resize. Free. No signup required. Try now!
✅ 100% Free⚡ Instant Results🔒 No Signup📱 Mobile Friendly🔐 No Data Stored
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Common Use Cases
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Responsive Testing
Check exact viewport dimensions at different browser sizes to verify CSS media query breakpoints.
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HiDPI Detection
Check device pixel ratio to determine whether to serve standard or high-resolution @2x image assets.
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Bug Reproduction
Record exact screen and viewport dimensions when filing browser layout bug reports.
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Asset Preparation
Verify your display resolution before preparing screen-optimized graphics and icons.
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Browser Debugging
Identify browser window dimensions affecting CSS layout issues and fixed position elements.
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Analytics Context
Compare your screen size to site analytics data to understand if you match your typical user base.
Frequently Asked Questions
What is the difference between screen resolution and viewport?
Screen resolution is your monitor total pixels. Viewport is the browser visible content area — it changes when you resize the window.
What is device pixel ratio (DPR)?
DPR shows how many physical pixels make one CSS pixel. Retina displays have DPR=2 or 3.
Does viewport update when I resize the browser?
Yes — viewport width and height update in real time as you drag the browser window edge.
Is the screen checker free?
Yes — completely free with no account required.
Can I use it on mobile?
Yes — it detects mobile screen and viewport dimensions accurately on all smartphone and tablet browsers.