Resolution Checker
Check your screen resolution, viewport size, pixel density, DPI, aspect ratio, color depth, and orientation. Upload an image to check its resolution. All values update live when you resize your browser window.
Screen Resolution LIVE
Your display properties detected automatically.
Screen Resolution
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Physical pixels
Viewport Size
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Browser window
Device Pixel Ratio
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Color Depth
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Aspect Ratio
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Orientation
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Available Area
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Minus taskbar
Physical Pixels
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CSS vs hardware
Resolution Standard Match
Your screen matches:
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Image Resolution Checker
Upload an image to check its dimensions, file size, and megapixels.
Click to upload or drag and drop an image
JPG, PNG, WebP, GIF, BMP, SVG
Dimensions
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File Size
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Megapixels
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Aspect Ratio
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How Resolution Checker Works
Check your screen resolution, pixel density, viewport size, and display info instantly. Detect DPI, aspect ratio, and color depth. tool. Provide your input in the form above and the tool analyzes it instantly in your browser, giving you actionable results without sending data to any server.
How to Check Your Screen Resolution
This resolution checker automatically detects your screen properties the moment you open the page. It reads your monitor's native resolution using the browser's screen.width and screen.height APIs, which report the total number of pixels your display can render. Unlike system settings that may show scaled or effective resolution, this tool shows both CSS pixels and the calculated physical pixel count based on your device pixel ratio. All values are read entirely client-side, so no data leaves your browser. If you resize the browser window, the viewport values update in real time, making it easy to test how web pages will look at different window sizes.
Understanding Pixel Density and DPI
Pixel density refers to how many physical pixels fit into one CSS pixel on your screen. A standard display has a device pixel ratio (DPR) of 1.0, meaning one CSS pixel equals one hardware pixel. High-DPI screens like Apple Retina displays, most smartphones, and modern 4K monitors use DPR values of 2.0 or higher. When DPR is 2.0, each CSS pixel is rendered using a 2 by 2 grid of physical pixels, which produces sharper text and more detailed images. This resolution checker calculates your physical resolution by multiplying CSS resolution by DPR, so a 1920 by 1080 screen with DPR 2.0 actually has 3840 by 2160 hardware pixels. Understanding DPI matters for graphic designers who need to export images at the correct size for high-resolution screens, and for developers who serve different image assets based on pixel density.
Common Screen Resolutions Explained
Screen resolutions follow industry standards that have evolved over decades. HD (1280 by 720) is the minimum high-definition standard still common on budget laptops and smaller displays. Full HD (1920 by 1080) is the most popular desktop resolution worldwide and the default for most gaming and streaming. QHD (2560 by 1440), also called 2K, offers a significant sharpness upgrade and is favored by professionals and gamers. 4K UHD (3840 by 2160) provides four times the pixels of Full HD and is increasingly standard on high-end monitors and televisions. 5K (5120 by 2880) is used by Apple iMac displays and some professional monitors. This tool compares your screen against all these standards and highlights which one matches your display, helping you understand where your hardware sits in the resolution hierarchy.
Resolution Checker for Images
Beyond screen detection, this tool lets you upload any image to inspect its resolution. When you drop or select a file, the tool reads its pixel dimensions, calculates the megapixel count (width multiplied by height divided by one million), measures the file size, and determines the aspect ratio. This is useful for photographers checking if an image meets print requirements, web developers verifying asset dimensions, social media managers ensuring images meet platform specifications, and anyone who needs to quickly know an image's properties without installing software. All processing happens locally in your browser, so your images are never uploaded to any server.
Frequently Asked Questions
What is my screen resolution?
Your screen resolution is the total number of pixels your display can show, measured as width by height. This tool detects it automatically when you open the page. For example, 1920 by 1080 means your screen has 1920 horizontal pixels and 1080 vertical pixels, totaling over two million pixels.
What is the difference between screen resolution and viewport size?
Screen resolution is the total pixel count of your physical display. Viewport size is the visible area inside your browser window where web content renders. The viewport is always smaller because browser toolbars, address bars, and OS elements like the taskbar take up space. Both values are shown in this tool.
What does device pixel ratio mean?
Device pixel ratio (DPR) is the ratio of physical hardware pixels to CSS pixels. A DPR of 1 means one CSS pixel equals one physical pixel. A DPR of 2 (common on Retina and 4K displays) means each CSS pixel uses a 2 by 2 grid of physical pixels, resulting in sharper rendering.
How do I check the resolution of an image?
Use the image upload section of this tool. Click the upload area or drag and drop any image file. The tool will display the image dimensions in pixels, file size, megapixel count, and aspect ratio. All processing happens locally in your browser.
What is the most common screen resolution?
As of 2025, 1920 by 1080 (Full HD) remains the most common desktop resolution worldwide, used by approximately 22 percent of all screens. On mobile, common resolutions include 1080 by 2400 and 1080 by 2340. This tool tells you exactly which standard your screen matches.
What resolution is 4K?
4K UHD resolution is 3840 by 2160 pixels, which is exactly four times the pixel count of Full HD (1920 by 1080). True cinema 4K is slightly wider at 4096 by 2160. This tool checks if your screen matches the 4K standard and shows the comparison in the standards table.