User Agent
View your browser user agent string and system information.
Enter your input above and click "Check" to see results.
What is a User Agent?
A user agent is a string that your browser (or other client) sends with every HTTP request. It identifies the application, version, operating system, and often the rendering engine. Servers use it to log traffic, serve different content by device, and detect bots.
Parsing the user agent lets you see the browser name and version, OS, device type (desktop, mobile, tablet), and whether the request is likely from a bot or crawler. If parsing fails, the raw string is still shown so you can debug or copy it.
Common uses:
- Debugging — Confirm which browser and OS your users have when reporting bugs.
- Bot detection — Identify crawlers (e.g. Googlebot, Bingbot) or block unwanted bots.
- Compatibility — Serve different CSS or scripts by engine or device (e.g. mobile vs desktop).
User Agent FAQ
What is a user agent string?
A user agent string is a line of text sent by your browser with each request. It usually includes the browser name and version, operating system, and sometimes the rendering engine (e.g. Blink, Gecko, WebKit). Servers use it to log and sometimes to adapt content.
How is my user agent detected?
When you click "Detect my UA", we use the User-Agent header from your current request. No input is required—it is read from the connection. For "Parse a custom User-Agent", you paste any UA string and we parse it without using your browser.
Why would I parse a custom user agent?
You might have a UA from logs, support tickets, or analytics and want to see browser, OS, device type, and whether it is a bot. Paste the string and click "Parse UA" to get the same breakdown without sending a live request.
Is my data stored?
We do not store your input. Results are generated on request. If you use Share, the result is saved temporarily (e.g. 24 hours) so you can share a link; that is optional.
What does bot/crawler detection mean?
We use simple heuristics: if the UA string contains words like "bot", "spider", "crawler", or known crawler names (e.g. Googlebot, Bingbot), we flag it as a bot. This is best-effort and may miss some bots or misclassify rare clients.