What is Screen Resolution Checker?

Screen Resolution Checker is a free online tool that instantly detects and displays your screen's technical specifications. Whether you're a web developer testing responsive designs, a gamer optimizing display settings, or simply curious about your monitor's capabilities, this tool provides all the information you need in one place.

Table of Contents

1. What is Screen Resolution Checker?
2. Why Check Your Screen Resolution?
3. What Information Does This Tool Provide?
4. How to Use Screen Resolution Checker
5. Features
6. Frequently Asked Questions

Why Check Your Screen Resolution?

Understanding your screen resolution is essential for several key reasons:

Web Development

Test how your website appears at different viewport sizes and breakpoints

Design Work

Ensure your graphics and layouts display correctly across different resolutions

Gaming

Optimize game settings for the best balance between visual quality and performance

Troubleshooting

Verify your display settings when experiencing visual issues

Hardware Comparison

Compare your current display specifications with potential upgrades

What Information Does This Tool Provide?

Our Screen Resolution Checker displays comprehensive information about your display:

Native Resolution

The actual physical pixel count of your monitor

Scaled Resolution

The effective resolution when display scaling is applied

Browser Viewport

The visible area where web content is displayed

Device Pixel Ratio (DPR)

The ratio between physical and CSS pixels

Color Depth

The number of bits used to represent colors

Aspect Ratio

The proportional relationship between width and height

CSS Breakpoint

Which responsive design breakpoint your viewport falls into

How to Use Screen Resolution Checker

Using our Screen Resolution Checker is straightforward. The tool automatically detects your screen information as soon as you load the page.

Reading Your Screen Information

The main display shows two key measurements:

Screen Resolution (amber/orange): Your monitor's native resolution in physical pixels. If you're using display scaling, you'll also see the scaled resolution and scaling percentage.
Browser Viewport (cyan/blue): The current size of your browser's content area. This changes when you resize your browser window.

Understanding the Stats

Below the main display, you'll find additional statistics:

Total Pixels: The total number of pixels on your screen, displayed in megapixels (MP)
Device Pixel Ratio: Shows how many physical pixels represent one CSS pixel (e.g., 2x for Retina displays)
Color Depth: Indicates your display's color capability (24-bit = 16.7 million colors)
Aspect Ratio: The width-to-height ratio of your current viewport

Using the Reference Panels

Switch between two helpful reference panels:

Common Resolutions: Compare your screen with standard resolutions for Desktop, Laptop, Tablet, and Mobile devices. Matching resolutions are highlighted.
Breakpoints: See which CSS breakpoint (XS, SM, MD, LG, XL, 2XL) your current viewport falls into - useful for responsive design testing.

Copying Your Screen Information

Click the Copy Info button or press Ctrl+C (Cmd+C on Mac) to copy all screen information to your clipboard. This is useful for sharing specifications or documenting your test environment.

Features

Screen Resolution Checker provides a comprehensive set of features to help you understand your display specifications.

Real-Time Detection

All measurements update automatically when you:

Resize your browser window
Change your display scaling settings
Rotate your device (on tablets and phones)
Connect to a different monitor

Visual Device Representation

The tool displays an interactive device frame that matches your current device type:

Desktop Monitor: Shown on large screens (1400px and above)
Laptop: Displayed for medium-large screens (992px - 1399px)
Tablet: Appears on medium screens (768px - 991px)
Mobile Phone: Shown on small screens (below 768px)

Display Scaling Detection

If your operating system uses display scaling (common on high-DPI monitors), the tool shows:

Your native (physical) resolution
Your scaled (effective) resolution
The scaling percentage being applied
A helpful notice explaining the scaling

Reference Comparisons

Compare your screen with common resolutions across different device categories:

Desktop Resolutions

Full HD (1920x1080)
2K QHD (2560x1440)
4K UHD (3840x2160)
5K (5120x2880)
8K UHD (7680x4320)

Laptop Resolutions

HD (1366x768)
WXGA+ (1440x900)
HD+ (1600x900)
MacBook Pro resolutions

Tablet Resolutions

iPad Mini
iPad Air
iPad Pro

Mobile Resolutions

iPhone SE
iPhone 14/15
Android devices

CSS Breakpoint Indicator

For web developers, the Breakpoints panel shows Bootstrap 5 responsive breakpoints:

Breakpoint	Size Range	Use Case
XS	Below 576px	Mobile phones
SM	576px and above	Large mobile devices
MD	768px and above	Tablets
LG	992px and above	Small desktops
XL	1200px and above	Desktops
2XL	1400px and above	Large desktops

One-Click Copy

Export all your screen information with a single click. The copied text includes:

Native and scaled resolution
Viewport dimensions
Total pixel count
Device pixel ratio
Color depth and aspect ratio
Device type and orientation
Current CSS breakpoint

Frequently Asked Questions

What is the difference between screen resolution and viewport size?

Screen resolution refers to your monitor's total pixel count (e.g., 1920x1080). Viewport size is the visible area within your browser window where web content appears. The viewport is typically smaller than your screen resolution because it doesn't include the browser's toolbars, address bar, and operating system taskbar.

Why does my resolution show a different number than my monitor specs?

This usually happens due to display scaling. Modern operating systems often scale the display to make text and icons easier to read on high-resolution monitors. For example, a 4K monitor at 150% scaling will show an effective resolution of 2560x1440 while the native resolution remains 3840x2160.

What is Device Pixel Ratio (DPR)?

Device Pixel Ratio is the relationship between physical pixels and CSS pixels. A DPR of 2x (common on Retina displays) means each CSS pixel is rendered using 4 physical pixels (2x2), resulting in sharper text and images. Higher DPR values indicate higher pixel density displays.

What does color depth mean?

Color depth indicates how many bits are used to represent color information. Most displays use 24-bit color (8 bits per RGB channel), which can display approximately 16.7 million colors. Professional and HDR displays may support 30-bit or higher color depth for smoother gradients and wider color gamuts.

How do CSS breakpoints work?

CSS breakpoints are specific viewport widths where a website's layout changes to accommodate different screen sizes. This tool uses Bootstrap 5 breakpoints: XS (mobile), SM (large mobile), MD (tablet), LG (small desktop), XL (desktop), and 2XL (large desktop). Web developers use these breakpoints to create responsive designs.

Why is my aspect ratio showing an unusual number?

The aspect ratio is calculated based on your current viewport dimensions, not your screen resolution. When you resize your browser to non-standard dimensions, you may see unusual aspect ratios. Common standard ratios include 16:9 (widescreen), 16:10 (common laptops), 4:3 (classic), and 21:9 (ultrawide).

Is my screen information sent to any server?

No. All detection is performed entirely in your browser using JavaScript. No screen information, resolution data, or any other details are transmitted to our servers or any third parties. Your privacy is fully protected.

Can I use this tool on mobile devices?

Yes. The Screen Resolution Checker works on all devices including smartphones and tablets. On mobile devices, you can also test orientation changes by rotating your device to see how the viewport dimensions update.