User Agent Check Tool: See Your Browser, Device & Privacy Info
Instantly detect your browser's user agent string and see what information your device reveals online. This tool breaks down your user agent, highlights privacy risks, and explains how websites use user agents for tracking, compatibility, and blocking. Learn how to change, spoof, or protect your user agent for better privacy—whether using proxies, VPNs, or scraping tools.
Your Browser User Agent
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
Browser:
Unknown
Device Type: Desktop
Operating System:
Unknown
Status:
Bot/Crawler Detected
This is the exact text your browser sends to every website you visit. It can reveal your software, device, and more.
| Element | Detected Value | What This Means |
|---|---|---|
| Browser | Unknown | Your browser brand and version. Websites use this for compatibility and analytics. |
| Operating System | Unknown | Reveals your device OS, which can affect site content and fingerprinting. |
| Device Type | Desktop | Whether you appear as a desktop, mobile, or tablet user. Used for responsive design and tracking. |
| Status | Bot/Crawler (Automated) | Sites may block, limit, or treat bots/crawlers differently from real users. |
What Is a User Agent String and Why Does It Matter?
A user agent is a text string your browser (or app) sends to every website you visit. It tells the site what browser and device you’re using, your operating system, and sometimes even your rendering engine or language. This helps websites display the right layout, enable features, or block unsupported browsers.
But your user agent also reveals a lot about you—sometimes more than you realize. For privacy-conscious users, those using proxies or VPNs, or anyone involved in web scraping, understanding your user agent is critical.
- Browser Compatibility: Sites use your user agent to serve compatible code or warn of outdated browsers.
- Device Targeting: Your device type (desktop, mobile, tablet) is inferred from the user agent.
- Tracking & Analytics: User agents can be used for analytics, fingerprinting, and even blocking or limiting users.
- Access Control: Some sites block certain browsers, bots, or scrapers based on user agent detection.
Tip: If you’re using a proxy, VPN, or scraping tool, always check your user agent to avoid privacy leaks or getting blocked.
User Agents & Privacy: What Does Yours Reveal?
- Fingerprinting: Your user agent—combined with screen size, plugins, and other data—can make you uniquely identifiable across the web.
- Location & Anonymity: Using a proxy or VPN? If your user agent says "Windows" but your proxy is in Brazil on mobile, sites may detect the mismatch and flag your session.
- Bot Detection: Static or outdated user agents are often flagged as bots. Automation scripts and scraping tools must rotate user agents to avoid detection.
- Privacy Risks: Revealing your actual device and browser can compromise your privacy—even with a proxy or VPN in place.
Learn more about proxy security tips and anonymous browsing.
What Info Does a User Agent Reveal?
- Browser and version number
- Operating system (and version)
- Device type (desktop/mobile/tablet)
- Rendering engine (e.g., Gecko, WebKit)
- Sometimes language, platform architecture, or even installed plugins
Your user agent is public on every website you visit.
How to Change or Spoof Your User Agent (and When You Should)
- Temporary Change (Testing): Most browsers let you change your user agent for testing. In Chrome/Edge, open DevTools (F12), go to Network Conditions, and select a different user agent.
- Browser Extensions: Install a reputable user agent switcher extension (search “User-Agent Switcher” for Chrome or Firefox). Always review extension permissions and privacy.
- Automation & Scraping: In tools like Selenium, Puppeteer, or Python requests, always set a realistic, rotating user agent string. See our bot automation guide.
- Via Proxies/VPNs: Some advanced proxy services let you set a default user agent for outgoing requests. This is useful for scraping or privacy-focused browsing.
- Mobile Browsers: Some mobile browsers allow switching user agent to request desktop or mobile versions of a site.
Tip: Never use obviously fake user agents (like "Googlebot/2.1" or "curl/7.64.1") unless you want to be blocked! Use realistic, up-to-date strings for better results.
When Should You Change Your User Agent?
- Testing website compatibility
- Web scraping or automation
- Bypassing blocks or region restrictions
- Emulating mobile/desktop views
Caution: Misrepresenting your user agent may violate website terms of service. Always use ethically.
User Agent FAQ & Troubleshooting
Some browsers, privacy extensions, or security-focused browsers (like Tor) may intentionally modify or minimize your user agent string to reduce tracking. Automation tools and scraping frameworks may also use simple, generic user agents by default. This can make you more anonymous—but may also break site compatibility or raise suspicion.
Yes, websites can analyze your user agent to block outdated browsers, known bot strings, or mismatched device/browser combos. For automation, use up-to-date, realistic user agents and rotate them to avoid detection. For privacy, avoid obvious "bot" agents unless needed for testing.
After changing your user agent (via DevTools, extension, or automation), reload this page or use any online user agent checker. If the displayed string matches what you set, the spoof is working. For scraping, programmatically fetch this page and verify the response.
No. Your user agent is set by your browser or app. Proxies and VPNs only change your IP address. For full privacy, use a proxy/VPN and a privacy-aware browser or extension to control your user agent as needed.
Fingerprinting is a technique websites use to identify users based on their browser info, plugins, fonts, screen size, and user agent. Even if you block cookies, a unique user agent (especially combined with other info) can help trackers follow you across sites. For maximum privacy, use browsers that randomize or minimize fingerprinting, like Tor or Firefox with privacy settings.
Changing your user agent is legal in most countries for privacy or testing purposes. However, using spoofed agents to bypass paywalls, scrape copyrighted data, or misrepresent your device may violate website terms of service and local laws. Always use ethically. Read more on legal considerations.
Explore more privacy & proxy tools: Try our IP Lookup, Proxy Checker, or Browser Privacy Check.
More Privacy Tips