User Agent Checker
Analyze any User Agent string to extract the browser, operating system, layout engine, and device type. Paste a user agent string below to inspect its specifications.
What is a User Agent?
A User Agent (UA) is a brief string of text sent by your web browser in the HTTP request headers to target web servers. It acts as an identifier, detailing the web browser name, render version, client operating system, and system architecture. Servers evaluate this metadata to serve optimized versions of HTML, CSS, and media properties matching the browser's capabilities.
Why Inspect User Agents?
User Agent analysis is a critical diagnostic step for web developers, security analysts, and systems administrators. Examining User Agents makes it easy to confirm that search engine crawl bots are properly identified, debug rendering glitches on legacy mobile layouts, check logs for spoofed client request attempts, and audit analytics metrics.
Frequently Asked Questions
What is a User Agent?
A User Agent is a string of text that your web browser shares with every website server you connect to. It lists the browser type, operating system, and build versions so servers can optimize content for your screen.
What does this User Agent Checker do?
This tool breaks down any User Agent string into clear, readable categories. It tells you the browser name, operating system, device type, and rendering engine, making it simple to analyze raw browser logs or test header options.
Can a User Agent be faked?
Yes, you can easily change or fake your User Agent string. Many developers do this using browser extensions or built-in developer tools to test how their web designs look on different platforms and devices without buying them.
How do search engines use User Agents?
Search engines like Google use specialized bot User Agents to identify themselves when crawling your website. This helps webmasters monitor crawler traffic and set specific rules in their robots.txt files to manage search engine indexing.
Why does my User Agent mention Chrome, Safari, and Mozilla?
Modern User Agents contain legacy tags like "Mozilla/5.0" and other browser names to ensure compatibility with older websites. Web developers used to block pages for non-Mozilla browsers, so new browsers added these keywords to prevent being locked out.
How can I find my own User Agent?
This page automatically displays your current browser's User Agent string in the main input field when you open it. You do not need to install any apps or configure settings to see your ID code.