Audit connected monitor configurations with our free Multi-Monitor Info tool. Query W3C Window Management APIs to identify primary vs. secondary displays, spatial resolution arrangements, and active window screen coordinates with 100% offline privacy.
The tool probes display metrics automatically on page load via browser APIs.
Grant Window Management permission if prompted to view multi-display spatial layouts.
View total connected screens, primary resolution, and window screen offsets.
Uses window.getScreenDetails() to query physical multi-display arrangements, primary flag indicators, and pixel bounds.
Traces active window offsets (window.screenX, window.screenY) to pinpoint which screen your browser window resides on.
Display inspection runs entirely in browser JS memory. No screen setup configuration is ever uploaded to servers.
The W3C Window Management API (formerly Multi-Screen Window Placement API) introduces window.getScreenDetails(). This asynchronous method returns an array of ScreenDetailed objects representing all active monitors connected to the operating system.
Each ScreenDetailed object provides attributes including isPrimary, isInternal, left, top, width, height, and devicePixelRatio, enabling web apps to place popup windows accurately across monitors.
When multi-screen permissions are not granted, standard DOM APIs (screen.width, window.screenX) only reveal the dimensions of the screen housing the active window to prevent cross-screen user fingerprinting.