Browser & Device Info Tools
10 tools in this collection — free, instant, and private in your browser.
Browser and device info tools reveal exactly what your browser tells websites about itself. Every time you visit a page, your browser sends a user agent string identifying its name, version, and operating system. It also exposes settings like your preferred language, whether you have requested reduced motion or high contrast, and whether you have opted out of tracking. These tools make that normally invisible data visible.
Developers use browser info tools constantly when diagnosing cross-browser bugs. Knowing the exact user agent string — including the engine version — is often the first step toward understanding why a feature behaves differently on two machines. The language detector shows which locale your browser is advertising, which matters when testing internationalized applications. The dark mode detector confirms whether your system preference is being picked up by CSS prefers-color-scheme media queries.
Privacy-conscious users have different reasons to explore these tools. The Do Not Track checker shows whether your DNT header is set and what it is actually communicating to servers. The cookie and storage support checker reveals what storage mechanisms are available in your current session, which can differ significantly in private browsing mode or when third-party cookies are blocked.
Accessibility testers round out the set: the notification tester checks whether your browser can request push permission, the clipboard tester verifies read and write access, and the fullscreen API tester confirms that immersive layouts will work. If you are building or testing a web app that relies on any of these browser capabilities, these tools let you verify them without writing a single line of code.
Start with the general browser info tool for a broad overview, then use the specialized checkers when you need to verify one specific capability or setting.
All browser & device info tools
All device tools →Compare these tools
| Tool | What it does |
|---|---|
| Browser Accessibility Settings Detector | Detect your browser's accessibility preferences: reduced motion, contrast, transparency and more. |
| Browser Language Detector | See every language your browser sends in the Accept-Language header, with locale details. |
| Browser Notification Tester | Test whether your browser supports notifications and request notification permission. |
| Clipboard Read & Write Tester | Test whether your browser supports clipboard read and write, and copy/paste text. |
| Cookie & Storage Support Checker | Check which storage APIs your browser supports: cookies, localStorage, sessionStorage, IndexedDB. |
| Dark Mode Detector | Detect whether your system prefers dark or light mode, plus accessibility settings. |
| Do Not Track Status & Privacy Settings | Check your Do Not Track setting, cookie status and privacy-related browser flags. |
| Fullscreen API Tester | Test the Fullscreen API, check support and toggle full-screen mode from your browser. |
| What Browser Am I Using | Detect your browser name, version and operating system instantly. |
| What Is My User Agent | See your browser's user agent string, platform, languages and more. |
Frequently asked questions
- What is a user agent string and why does it matter?
- A user agent string is a text identifier your browser sends with every HTTP request. It tells web servers which browser, version, and operating system you are using so they can serve compatible content. Developers inspect it to debug rendering issues, and some legacy sites use it to serve different page versions.
- Will the clipboard tester actually read what I have copied?
- It can, but only if you grant clipboard permission when the browser asks. The test simply confirms whether the Clipboard API is available and whether read or write access is permitted in your current browser and operating system configuration. No clipboard content is sent anywhere.
- I have Do Not Track enabled but sites still seem to track me. Why?
- DNT is a browser signal, not a technical block. Most advertising networks and analytics services choose to ignore it because it has no legal enforcement in most jurisdictions. Enabling DNT tells sites your preference, but compliance is entirely voluntary. Browser extensions that block trackers at the network level are more effective.