User-Agent parsing, browser info, screen resolution check
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/145.0.0.0 Safari/537.36Browser compatibility testing and debugging
Viewport size checking and media query testing
Understanding visitor browser and device info
Optimization strategies based on network conditions
You can check browser name and version, operating system, screen resolution, viewport size, pixel ratio, touch support, and network connection type. A feature to analyze User-Agent strings you enter manually is also provided.
Browser fingerprinting is a technique that identifies users by combining various browser and device characteristics. It collects multiple attributes such as resolution, fonts, and plugin lists to create a unique identifier. The information displayed by this tool is a part of that.
Most information is collected via JavaScript APIs provided by the browser and matches the actual values. However, some modern browsers reduce or modify the User-Agent for privacy protection, which may lower accuracy.
No. The device and browser information collected by this tool is never sent to or stored on any server. All analysis is processed locally within the browser only.
Web developers need to ensure their sites work correctly across a wide range of devices and browsers. By knowing the screen resolution, viewport size, and pixel ratio, you can implement responsive designs more precisely and serve optimized images for high-resolution displays.
The User-Agent string is identification information a browser sends to a server to introduce itself. It contains browser type, version, and operating system details, which the server uses to serve compatible content. Recently, there is a trend toward reducing User-Agent information to protect user privacy.
Connection type (4G, WiFi, etc.) and speed information obtained via the Network Information API can be used for adaptive content loading. On slow connections, serving lower-resolution images or reducing unnecessary resource loads can improve the user experience.