- What device and browser information does this tool detect?
- It detects and displays: browser name and version (Chrome, Firefox, Safari, Edge), rendering engine (Blink, Gecko, WebKit), operating system and version, full user agent string, screen resolution in physical pixels, CSS viewport dimensions, device pixel ratio (DPR/Retina scale), screen orientation, color depth, touch/pointer support, preferred language and locale, timezone, and network connection type when available.
- What is device pixel ratio (DPR) and why does it matter for web development?
- Device pixel ratio is the ratio of physical display pixels to CSS pixels. A DPR of 2 (common on Retina displays) means each CSS pixel maps to a 2x2 grid of physical pixels. Understanding DPR is critical for responsive design — it affects image sharpness (use 2x images for Retina), CSS media queries using resolution/min-resolution, canvas rendering, and why layouts may appear different sizes on screens with identical CSS viewport dimensions.
- How do I find my user agent string for a bug report?
- Open this page and the full user agent string is displayed automatically. Click the copy button to copy it to your clipboard. Include this string in bug reports, support tickets, and compatibility issue documentation so developers can identify your exact browser, version, OS, and rendering engine for reproduction.
- Can I check device info on my iPhone, Android phone, or tablet?
- Yes. Open this page directly in any mobile browser (iOS Safari, Chrome for Android, Samsung Internet, Firefox Mobile) to see your mobile device's screen resolution, viewport dimensions, DPR, OS version, and user agent. This is especially useful for testing responsive layouts and debugging mobile-specific rendering issues.
- What is the difference between screen resolution and viewport size?
- Screen resolution is the total physical pixel dimensions of your display (e.g., 2560x1440). Viewport size is the CSS pixel area available to the web page after accounting for browser chrome, toolbars, and scrollbars (e.g., 1440x900). Responsive CSS media queries use viewport dimensions, not screen resolution, which is why both values are important for debugging layout breakpoints.
- Is my device information stored or shared with any server?
- No. All device detection runs 100% client-side using standard browser JavaScript APIs (navigator, screen, window objects). No data is transmitted to any server, stored in any database, or shared with third parties. The information is displayed only in your browser for your inspection.
- Is this device information checker free to use?
- Yes, completely free with no signup, no installation, and no usage limits. Works instantly in any modern browser on desktop computers, laptops, tablets, and mobile phones.
