Find Your Screen Size & Resolution Instantly
Quickly determine your screen resolution, browser viewport, pixel density, and other key display specifications with our real-time detection tool.
Values update in real-time as you resize your browser window.
Core Display Terminology Explained
Understanding these metrics is key to optimizing your display for work, gaming, or creative projects.
Screen Resolution
The total count of physical pixels on your display (width x height). Higher resolutions provide sharper images and more detail.
Viewport Size
The visible area inside your browser window for web content. It excludes browser toolbars, scrollbars, and system UI like the taskbar.
Pixel Ratio (DPR)
The ratio of physical pixels to logical pixels (CSS pixels). A 2x DPR on a "Retina" screen means 4 physical pixels are used for every 1 logical pixel, creating ultra-sharp text.
Guide to Common Screen Resolutions
1920 × 1080 (Full HD)
The industry standard for most laptops and desktop monitors, perfect for everyday tasks and 1080p media.
2560 × 1440 (QHD)
A step-up for gaming and productivity, offering significantly more screen real estate and detail than Full HD.
3840 × 2160 (4K UHD)
Ideal for high-end creative work, 4K media consumption, and immersive gaming, providing exceptional clarity.
3440 × 1440 (Ultrawide)
Popular for multitasking and immersive gaming, offering a wider field of view with the vertical resolution of QHD.
Popular Device Display Sizes
A reference guide to the resolution and viewport sizes of common devices on the market.
Smartphones
Tablets
Laptops & Desktops
Frequently Asked Questions
What is the difference between screen resolution and viewport size?
Screen resolution is the total number of physical pixels your monitor has (e.g., 1920 × 1080). Viewport size is the smaller, usable area inside your web browser where content actually appears, excluding browser toolbars and system taskbars.
Why does my detected resolution seem lower than my monitor's native resolution?
This is almost always due to display scaling. High-resolution screens (like 4K) often have scaling enabled in the OS (e.g., 150% in Windows) to make text readable. This tool reports the 'scaled' or 'logical' resolution that web content is rendered at, not the raw physical pixel count of the panel.
What does Device Pixel Ratio (DPR) mean?
DPR indicates the density of pixels. A DPR of 1x means one physical pixel is used for one CSS (logical) pixel. A DPR of 2x (found on Retina/HiDPI displays) means a 2x2 grid of four physical pixels is used for one CSS pixel, resulting in much sharper images and text.
Explore More Testing Tools
Explore our full range of testing tools to enhance your device performance and display quality.
Dead Pixel Test
Find and attempt to fix stuck pixels on your screen.
Frame Rate Test
Measure your browser's real-time rendering performance in FPS.
Refresh Rate Test
Verify your monitor's actual refresh rate (Hz).
Backlight Bleed Test
Check your display for backlight bleeding and uniformity issues.
Screen Size & Resolution
Instantly detect your screen resolution, viewport size, and other display properties.
All Tools
All screen testing tools in one place. Test your display performance, refresh rate, FPS, colors, and more.