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What is my browser resolution?
The size of the viewable portion (also known as viewport) of your web browser window is known as browser resolution. The width and height of the viewable portion of your web browser window are in pixels.
Web developers, designers, and anyone else testing how websites look on various devices must be aware of your browser's viewport.
When you resize your browser window, the viewport dimensions change accordingly. This has a direct effect on how content is rendered on websites.
Many people confuse screen resolution with browser resolution. However, they have different functions in web development.
The total number of physical pixels that your device can display is known as the screen resolution. For example, a Full HD monitor displays 1920 pixels horizontally and 1080 pixels vertically, giving you 2,073,600 total pixels.
The visible portion of your browser window where web pages are rendered is known as browser resolution. Toolbars, bookmark bars, scrollbars, etc. are not included in this. Even on a 1920×1080 display, your browser viewport might only be 1920×950 pixels when the browser runs maximised.
This distinction is important because responsive websites choose which layout to display based on viewport dimensions. A developer building breakpoints at 768px, 1024px, and 1440px needs to know the browser resolution size, not the screen resolution.
Our browser resolution checker tool used JavaScript to instantly determine your browser resolution dimensions.
The tool automatically measures the width and height of your browser viewport area (also known as viewable area) using the window.innerWidth and window.innerHeight properties.
The resolution of your browser instantly changes when you resize its window. Our tool provides precise real-time information about the viewport size of your browser. Additionally, the tool determines how many pixels are available in your viewport overall. It helps you to understand the rendering space available for web content.
Prioritize testing these viewport dimensions based on actual usage statistics:
Testing at these specific sizes covers the vast majority of devices.
JavaScript allows to programmatically detect browser resolution. You can use JavaScript to detect resolution of a browser window using the code below:
// Get current viewport dimensions
const viewportWidth = window.innerWidth;
const viewportHeight = window.innerHeight;
const totalPixels = viewportWidth * viewportHeight;
// Log the values
console.log(`Width: ${viewportWidth}px`);
console.log(`Height: ${viewportHeight}px`);
console.log(`Total Pixels: ${totalPixels.toLocaleString()}`);
// Detect viewport changes
window.addEventListener('resize', () => {
const newWidth = window.innerWidth;
const newHeight = window.innerHeight;
console.log(`Resized to: ${newWidth}x${newHeight}`);
});
This code allows for dynamic layout adjustments based on available space by responding to resize events. Also, providing real-time viewport measurements.
| Device | Viewport Size | Screen Resolution | DPR | Notes |
|---|---|---|---|---|
| iPhone SE | 375 × 667 | 750 × 1334 | 2.0 | Compact mobile size |
| iPhone 13/14 | 390 × 844 | 1170 × 2532 | 3.0 | Standard iPhone |
| iPhone 14 Pro Max | 430 × 932 | 1290 × 2796 | 3.0 | Large iPhone |
| Samsung Galaxy S21 | 360 × 800 | 1080 × 2400 | 3.0 | Standard Android |
| Google Pixel 7 | 412 × 915 | 1080 × 2400 | 2.6 | Google's flagship |
| Samsung Galaxy A52 | 360 × 800 | 1080 × 2400 | 3.0 | Mid-range Android |
| Device | Viewport Size | Screen Resolution | DPR | Notes |
|---|---|---|---|---|
| iPad Mini | 768 × 1024 | 1536 × 2048 | 2.0 | Compact tablet |
| iPad Air | 820 × 1180 | 1640 × 2360 | 2.0 | Standard iPad |
| iPad Pro 11" | 834 × 1194 | 1668 × 2388 | 2.0 | Pro tablet |
| iPad Pro 12.9" | 1024 × 1366 | 2048 × 2732 | 2.0 | Large tablet |
| Samsung Tab S8 | 753 × 1037 | 1600 × 2560 | 2.1 | Android tablet |
| Resolution Name | Viewport Size (Max) | Common Usage | Notes |
|---|---|---|---|
| HD (720p) | 1280 × 720 | Older laptops | Minimum desktop target |
| HD+ | 1366 × 768 | Budget laptops | Very common in 2020s |
| FHD (1080p) | 1920 × 1080 | Standard desktop | Most popular desktop size |
| QHD (1440p) | 2560 × 1440 | Gaming monitors | High-end displays |
| 4K UHD | 3840 × 2160 | Professional work | Premium displays |
Screen Resolution: The actual physical pixels on your display hardware.
Example: 2560 × 1600 pixels on a MacBook Pro.
Viewport Size: The CSS pixels available in your browser window.
Example: 1440 × 900 pixels (after DPR scaling).
Device Pixel Ratio (DPR): Physical pixels ÷ CSS pixels.
Example: 2560 ÷ 1440 ≈ 1.78 DPR (rounded to 2.0).
Formula: Screen Resolution = Viewport Size × DPR.
| Category | Min Width | Max Width | Target Devices |
|---|---|---|---|
| Extra Small | 0px | 575px | Small phones |
| Small | 576px | 767px | Large phones |
| Medium | 768px | 991px | Tablets |
| Large | 992px | 1199px | Desktops |
| Extra Large | 1200px | 1399px | Large desktops |
| XXL | 1400px+ | — | Ultra-wide displays |
When you visit this page, our tool automatically shows the exact viewport dimensions of your browser. To see your current width and height in pixels, just look at the numbers displayed.
Only the visible content area within your browser window is measured by browser resolution. Excluding browser chrome, toolbars, and scrollbars. Your entire display is measured by the screen resolution.
The screen resolution is always equal to or less than the browser viewport.
Just adjust the size of your browser window to see the real-time dimensions change. As an alternative, you can test different viewport sizes by using the browser developer tools (F12 in most browsers), which provide device emulation.
Not directly, but responsive websites load different assets (responsive images) depending on the size of the viewport.
When designing for mobile devices, start with a width of 320 pixels and add breakpoints at standard sizes (768, 1024, and 1440 pixels) as needed by your layout. Test at the viewport sizes that your audience is using, according to your analytics.
Device pixel ratio scaling is used by mobile devices to maintain readable content. To guarantee usable interface sizes, a phone with 1080x1920 physical pixels may report a 360x640 viewport.
Yes, trustworthy tools like ours employ common JavaScript APIs (window.innerWidth / window.innerHeight) that provide precise viewport dimensions for all contemporary browsers.
Test during initial development, after major layout changes, and periodically as new devices with different viewport sizes gain market share.
Regular browser resolution testing ensures your website provides excellent experiences across the diverse devices people use to access the internet. By understanding viewport dimensions and testing at common sizes, you can catch layout issues before they affect real users.
Our free browser resolution tester gives you instant, accurate viewport measurements without installing software or extensions. Use it throughout your development process to verify your responsive designs work correctly at every size.
Remember that viewport dimensions matter more than screen resolutions when building responsive websites. Focus your testing on the CSS pixel measurements that browsers report, account for device pixel ratios on high-DPI displays, and verify your layouts adapt smoothly across the full range of sizes your audience uses.
Start testing your browser resolution now to ensure your website looks perfect on every device.
We hope you liked the browser resolution tester (detecter) tool. To use other digital tools, visit our website regularly.
This browser resolution detection tool operates entirely within your browser. We do not collect, store, or transmit any information about your browser, device, or usage patterns. All analysis happens locally on your device.