💡 Expert Insight: Don't confuse 'logical resolution' (what CSS sees) with 'physical resolution' (actual pixels). High-DPI (Retina) screens often report lower logical resolution (e.g., 390px width) despite having high physical pixel counts.
Check Your Screen Specs Instantly
Curious about your exact screen size or pixel density? Our Screen Resolution Checker tells you everything you need to know.
See your resolution, viewport size, and color depth in real-time. It's a handy tool for designers, developers, or anyone troubleshooting display issues.
What Screen Information Does This Show?
Screen Resolution
Native resolution in pixels (width × height). Common resolutions: 1920×1080 (Full HD), 2560×1440 (2K), 3840×2160 (4K). Higher resolution = more screen space.
Device Pixel Ratio (DPR)
Ratio of physical pixels to CSS pixels. Standard displays = 1.0, Retina/HiDPI displays = 2.0-3.0. Affects image sharpness and rendering quality.
Color Depth
Bits per pixel for color representation. Common values: 24-bit (16.7 million colors), 30-bit (1.07 billion colors). Higher depth = better color accuracy.
Orientation
Portrait or landscape mode. Changes when rotating mobile devices or using monitor pivot features.
Browser Viewport Size
Actual browser window dimensions (excluding toolbars, scrollbars). Changes when resizing browser. Critical for responsive web design testing.
Common Screen Resolutions
Desktop/Laptop Resolutions
- 1366×768: Budget laptops, older monitors
- 1920×1080 (Full HD): Most common desktop/laptop standard
- 2560×1440 (2K/QHD): High-end monitors, gaming displays
- 3840×2160 (4K/UHD): Premium displays, content creation
- 5120×2880 (5K): Apple iMac, professional monitors
Mobile Resolutions
- 375×667: iPhone SE, older iPhones
- 390×844: iPhone 13/14/15 standard models
- 393×851: Android flagship phones (Galaxy S)
- 768×1024: iPad, smaller tablets
- 1080×1920: Android tablets
Ultra-Wide & Special Formats
- 2560×1080 (21:9): Ultra-wide gaming/productivity
- 3440×1440 (21:9): Premium ultra-wide
- 5120×1440 (32:9): Super ultra-wide (dual monitor equivalent)
📝 Example: MacBook Pro 16"Display Specs
- Screen Resolution: 3456 × 2234 pixels
- Pixel Ratio: 2.0× (Retina display)
- Effective Resolution: 1728 × 1117 (CSS pixels)
- Color Depth: 30-bit (billions of colors)
Physical pixels doubled for sharper text and images.
Understanding Pixel Density
PPI (Pixels Per Inch)
Measure of screen sharpness. Calculate: √(width² + height²) ÷ diagonal inches
- <100 PPI: Pixelated, low quality
- 100-150 PPI: Standard definition
- 200-300 PPI: Retina quality (Apple standard)
- >300 PPI: Ultra-high density (smartphones)
Device Pixel Ratio Explained
DPR 1.0: One CSS pixel = one physical pixel (standard displays)
DPR 2.0: One CSS pixel = 2×2 physical pixels (Retina displays)
DPR 3.0: One CSS pixel = 3×3 physical pixels (high-end phones)
Higher DPR requires higher-resolution images to avoid blurriness.
Responsive Design Breakpoints
Standard Breakpoints
Common CSS media query breakpoints for responsive websites:
- Mobile: 320px - 480px
- Tablet Portrait: 481px - 768px
- Tablet Landscape: 769px - 1024px
- Desktop: 1025px - 1200px
- Large Desktop: 1201px+
Testing Responsive Layouts
Use screen resolution tool to:
- Check current viewport dimensions
- Resize browser window to simulate different devices
- Verify layout adapts at breakpoints
- Test both width and height for portrait/landscape
Graphics & Design Considerations
Image Optimization for Different Screens
Display Troubleshooting
Resolution Not Optimal
Problem: Screen looks blurry or pixelated
Solutions:
- Check native resolution in monitor manual/specs
- Set OS display settings to native resolution
- Update graphics drivers
- Use correct cable (HDMI 2.0+ for 4K@60Hz)
Text Too Small on High-Res Displays
Problem: 4K monitor makes UI elements tiny
Solution: Adjust display scaling in OS settings:
- Windows: Settings → Scale 125-150%
- macOS: System Preferences → Displays → Scaled
- Linux: Display Settings → Resolution Scaling
Multi-Monitor Resolution Mismatch
Problem: Moving windows between monitors changes size
Cause: Different pixel densities between monitors
Mitigation: Use monitors with similar PPI or adjust per-monitor scaling
Gaming & Performance
Resolution vs Frame Rate
- 1080p (1920×1080): Easiest to run, high FPS possible
- 1440p (2560×1440): 78% more pixels than 1080p, moderate GPU load
- 4K (3840×2160): 4× pixels vs 1080p, demands high-end GPU
Lower resolution = higher FPS with same GPU. Competitive gamers often prefer 1080p@240Hz over 4K@60Hz.
Aspect Ratio Impact
- 16:9: Standard gaming, most compatible
- 21:9: Wider FOV in games, immersive but not all games support
- 4:3: Legacy aspect ratio, black bars in modern games
