Automatically check your browser’s User-Agent information
When you access this page, your browser’s User-Agent information is automatically displayed.
It works on mobile devices as well, making it useful for testing and debugging.
You can also access this tool via https://vvd.im/agent for quick access.
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
Have questions?
Find answers here.
A user agent is “content” that is automatically sent to identify the software (mainly a web browser) used to access a website, including its type, version, and operating system information.
Popular web browsers include Google Chrome, Microsoft Edge, Naver Whale, Mozilla Firefox, Safari, and more.
For example, a typical user agent “content” might look like:Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36
This information contains the browser type, version, rendering engine, and details about the operating system.
However, since the “content” can change every time a browser or operating system is updated, you should not rely solely on this information to definitively identify a browser or OS.
User agent data is mainly used for access analytics, UI customization, debugging, and improving service quality.
Websites use User Agent information to identify your browser type, operating system, and device.
In the past, websites often appeared differently or had unique features depending on the browser you used, but today most sites are highly compatible and look nearly identical across browsers.
Still, based on the User Agent, websites can provide browser-specific features, custom UIs, or direct you to the appropriate app store (for example, iPhone users may be sent to the App Store, Android users to Google Play).
For companies and service providers, User Agent data makes it possible to deliver optimized experiences tailored to different user environments or to notify users when a feature is only available on certain browsers or devices.
User Agent information is also widely used for analytics, marketing strategies, security policies, anomaly detection, and browser-specific debugging—helping ensure the best possible web service quality.
In everyday browsing, you usually don’t need to pay attention to your User Agent information.
However, in many situations—such as web development, app integration, troubleshooting site errors, browser compatibility testing, or resolving access issues with specific services—it becomes important to directly check your browser’s User Agent value.
For example:
- When a certain website feature doesn’t work as expected
- When customer support asks you to “provide your User Agent value”
- When developing apps or Chrome extensions and you need to see the actual User Agent value in a live environment
Using this tool, you can quickly and accurately copy and share your User Agent information.
The User Agent you check yourself becomes essential data for troubleshooting, service improvement, technical support, and collaborative development.