Screen Resolution Checker

Check your screen resolution, viewport size, and device pixel ratio. Essential information for responsive design testing.

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- Screen Resolution
Screen Size -
Viewport Size -
Color Depth -
Pixel Ratio -
Orientation -
Touch Screen -

Common Screen Resolutions

NameResolutionAspect Ratio
HD (720p)1280 × 72016:9
Full HD (1080p)1920 × 108016:9
QHD (1440p)2560 × 144016:9
4K UHD3840 × 216016:9
MacBook Pro 14"3024 × 1964~3:2
iPhone 14 Pro2556 × 1179~19.5:9
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How to Use Screen Resolution Checker

  1. View your screen resolution instantly
  2. Check viewport size for responsive design
  3. See pixel ratio for retina displays
  4. Reference common resolutions table
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About Screen Resolution Checker

Screen resolution affects how websites and applications appear. Our detector shows your exact screen dimensions, browser viewport size, and pixel density—essential information for designers, developers, and troubleshooting display issues.

Measurements Displayed

Complete screen information:

  • Screen resolution: Physical display dimensions in pixels
  • Viewport size: Browser window dimensions (what websites see)
  • Device pixel ratio: Ratio of physical to CSS pixels (retina detection)
  • Color depth: Bits per pixel for color display

Why It Matters

Responsive design targets viewport size, not screen resolution. A 1920x1080 screen might have a 1536x864 viewport at 125% scaling. Understanding these differences helps debug responsive design issues and ensure proper display.

Retina and HiDPI

Device pixel ratio indicates display density. A ratio of 2 means retina/HiDPI (each CSS pixel maps to 4 physical pixels). Images need higher resolution to appear sharp on these displays.

Sharing with Support

When reporting display bugs, share these measurements with developers or support teams. Precise information helps reproduce and fix issues faster than vague descriptions.

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Frequently Asked Questions

What screen information does this tool show?
We display: screen resolution (total pixels), viewport size (browser area), device pixel ratio (for retina/HiDPI), color depth, orientation, and available screen space. Updates in real-time as you resize.
What is the difference between screen and viewport?
Screen resolution is your monitor's total pixels. Viewport is the browser's content area (excludes toolbars, scrollbars). For web development, viewport matters more - it's what users see. Screen resolution helps with display settings.
What is device pixel ratio?
Device pixel ratio (DPR) is the ratio of physical pixels to CSS pixels. DPR of 2 (retina) means 2 physical pixels per CSS pixel - sharper display. High-DPI screens need higher resolution images for crisp display.
Why test different resolutions?
Responsive design must work across device sizes. Our tool lets you simulate different viewport sizes without actual devices. Test how your site adapts to common resolutions: mobile (375px), tablet (768px), desktop (1920px), etc.
What are common screen resolutions I should test?
Key breakpoints: 320px (small mobile), 375px (iPhone), 768px (tablet), 1024px (tablet landscape/small desktop), 1440px (desktop), 1920px (full HD), 2560px+ (QHD/4K). Test critical sizes for your audience.
How accurate is browser-based resolution detection?
Very accurate for what the browser sees. However, browser zoom affects viewport size, and CSS pixels may differ from actual pixels. The values shown match what CSS and JavaScript would detect - perfect for web development testing.