User Agent Checker – Instantly View Your Browser’s User Agent

Your browser sends a User Agent string to every website you visit. This string contains important technical information about your browser, operating system, and device type. With 99tools.in’s User Agent Checker, you can instantly view this data and understand what your browser is sharing.

Your User Agent Info

IP: 20.171.207.236
User Agent: Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; GPTBot/1.2; +https://openai.com/gptbot)
Platform: Linux 5.14.0-503.40.1.el9_5.x86_64

Find Out What Your Browser Tells Websites About You

Your browser sends a User Agent string to every website you visit. This string contains important technical information about your browser, operating system, and device type. With 99tools.in’s User Agent Checker, you can instantly view this data and understand what your browser is sharing.

What Is a User Agent?

A User Agent (UA) is a string of text your browser automatically sends to web servers when you visit a website. It typically includes:

  • Browser name and version

  • Operating system and device info

  • Rendering engine (e.g., WebKit, Gecko)

  • Platform (desktop, mobile, tablet)

For example

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36


Why Use Our User Agent Checker?

Instant Results – See your full User Agent string in a single click
No Installation – 100% web-based and mobile-friendly
Real-Time Detection – Shows exactly what websites see
Developer Friendly – Perfect for testing browser-specific features
Privacy Insight – Know what fingerprinting data your browser exposes


🧰 Who Should Use a User Agent Checker?

  • Developers – Debug browser compatibility or implement user agent-based features

  • Testers – Check how your site behaves across devices and browsers

  • SEO Experts – Simulate bots or user agents to verify site rendering

  • Privacy Advocates – Understand the data your browser reveals

  • Support Teams – Help users report environment details for troubleshooting


🔗 Related Tools for a Complete Web Diagnostic

Maximize your insight with these complementary tools:


💬 FAQs

Q: What can websites do with my user agent?
Websites can customize content or layout based on your user agent, but they can also use it as part of browser fingerprinting for tracking purposes.

Q: Can I change my user agent?
Yes. Most modern browsers allow you to spoof or override your user agent using developer tools or extensions.

Q: Is this tool free?
Yes, it’s completely free and doesn’t store or track your user agent data.

User agent checker

Online user agent viewer

What is my user agent

Browser user agent string

User agent string lookup

Browser fingerprinting info

Developer user agent tool

Check my browser info

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