Screen Resolution Checker
Check your screen resolution, pixel density, and display information in real-time.
Understanding Screen Resolution
Screen resolution refers to the number of pixels your display can show horizontally and vertically. Higher resolutions mean more pixels, resulting in sharper images and more screen real estate. Understanding your screen resolution helps with design decisions, media consumption, and troubleshooting display issues.
This tool detects your actual screen resolution, available screen space (excluding system UI like taskbars), pixel density (DPI), and current viewport dimensions. All values update in real-time as you resize your window.
Common Screen Resolutions
HD (1280×720) was the first high-definition standard. Full HD (1920×1080) remains the most common resolution. QHD or 2K (2560×1440) offers enhanced clarity. 4K UHD (3840×2160) provides exceptional detail for large displays and professional work.
Pixel Ratio Explained
Pixel ratio indicates how many physical pixels represent one CSS pixel. Retina and HiDPI displays have ratios of 2x or higher, meaning they pack more physical pixels into the same space for sharper rendering. Standard displays have a 1x ratio.
Screen vs Viewport
Screen resolution is your display's total pixels. Viewport is the visible browser area, which is smaller due to browser chrome, toolbars, and system UI. Web developers design for viewport dimensions, not screen resolution.
Resolution and Responsive Design
Modern websites use responsive design to adapt to various resolutions. CSS media queries target different screen sizes, ensuring optimal layouts for phones, tablets, and desktops. Testing across resolutions is essential for quality assurance.
Checking Resolution for Media
Knowing your resolution helps choose appropriate video quality settings. 4K screens can display 4K content at full quality. Lower resolutions waste bandwidth streaming higher quality than displayable.