User Agent Checker – Check Your Browser User Agent Free
Check your browser's user agent string. See browser name, version, OS, device type, and rendering engine. Free user agent tool.
What is User Agent Checker?
A user agent checker reads the user agent string sent by your browser to web servers and parses it to display the browser name and version, operating system, device type (desktop, mobile, tablet), rendering engine, and other technical details. User agent strings are used by websites to serve browser-appropriate content and by developers to debug browser-specific issues.
How to Use User Agent Checker
- 1Open the tool — your user agent is detected automatically from your browser.
- 2Review the parsed browser name, version, and operating system.
- 3See your device type (desktop, mobile, tablet).
- 4Copy your full user agent string with one click.
- 5Use the custom user agent tester to parse any user agent string.
Key Features
- ✓Automatic user agent detection
- ✓Browser name and version
- ✓Operating system and version
- ✓Device type detection (desktop/mobile/tablet)
- ✓Rendering engine identification
- ✓Custom user agent string parser
Benefits
- →Debug browser-specific issues in web development
- →Verify how your site detects different browsers
- →Test how servers respond to different user agents
- →Identify bots and crawlers by their user agent strings
Why Use Irreva for User Agent Checker?
Frequently Asked Questions
What is a user agent string?
A user agent (UA) string is a text identifier sent by your browser to every web server you visit. It tells the server which browser, operating system, and device you are using so the server can serve appropriate content.
Why do websites check the user agent?
Websites use the user agent to serve mobile-optimized layouts, apply browser-specific CSS fixes, block bots, and tailor content. Some analytics tools also rely on UA parsing to report browser and device stats.
Can I change my user agent?
Yes. Most browsers allow you to spoof a different user agent through developer tools (usually under Network conditions). Browser extensions can also override the UA header on all requests.
Is my user agent sent to Irreva?
No. This tool reads your user agent directly from the browser's navigator.userAgent property in JavaScript. Nothing is sent to Irreva's servers.
What is the difference between the browser engine and the browser?
The rendering engine (Blink, WebKit, Gecko) is the underlying technology that interprets HTML, CSS, and JavaScript. Multiple browsers can share the same engine — for example, Chrome, Edge, and Opera all use Blink.
What is a user agent?
A user agent is a string sent by your browser in HTTP request headers that identifies the browser, its version, operating system, and rendering engine to the web server.
Do search engine bots have user agents?
Yes. Googlebot identifies itself with a specific user agent string (e.g., 'Googlebot/2.1'). Servers can use this to serve bot-specific content or block unwanted bots via robots.txt.
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