What is User Agent Parser & Client Info?
The User Agent Parser analyzes the raw user-agent string sent by a web browser to extract device, operating system, browser brand, version, engine, and device type details. Every browser sends a user-agent header to identify itself to web servers; parsing this string is crucial for debugging browser-specific bugs, custom styling, and auditing visitors.
How to Use User Agent Parser & Client Info
- The tool automatically detects and displays your own browser's user-agent string and parsed details.
- To parse a different user-agent (e.g., from server logs or mobile devices), paste it into the search input box.
- Click 'Parse User Agent'.
- Review the detailed breakdown showing the operating system name and version, browser engine, and device category.
Common Use Cases
- Web developers debugging website bugs that only happen on specific browser versions or mobile models.
- Security auditors analyzing server access logs to identify suspicious automated bots or scrapers.
- Analytics teams identifying the most popular client devices used by their visitors.
Pro Tips & Best Practices
- Many modern bots and web crawlers spoof standard browser user-agent strings. To verify if a request is actually from Googlebot, perform a reverse DNS lookup rather than relying only on the user-agent string.