User-Agent Parser | Browser, OS and Device Detector
Parse a user-agent string to identify browser, rendering engine, operating system, device family, CPU hints, and bot-like signals.
What the User-Agent Parser Reveals
The user-agent parser reads a browser or crawler string and identifies browser, engine, operating system, device family, CPU hints, and bot-like signals where possible.
Why User-Agent Data Can Be Imperfect
User-agent strings can be spoofed, reduced for privacy, or formatted differently by apps and crawlers. Treat the result as a useful clue, not an identity guarantee.
When to Parse a User-Agent
Use it while debugging logs, checking browser compatibility, investigating bots, reviewing analytics anomalies, or testing how a site detects devices.
About This Tool
User Agent Parser decodes a user agent string into its component parts: browser name and version, operating system, device type, and rendering engine. It turns an opaque string like Mozilla/5.0... into human-readable details.
When to Use It
Use this when analysing server logs to understand which browsers are visiting your site, when debugging a CSS or JavaScript issue that only affects one browser, or when verifying what user agent a script or bot is sending.
How to Use
- Paste the user agent string into the input field.
- Click Parse to analyse it.
- Review the detected browser, OS, device, and engine.
- Use your own current user agent by clicking the Detect My UA button.
Frequently Asked Questions
Can I detect my own browser's user agent?
Yes. Click Detect My User Agent and the tool reads the user agent your current browser is sending.
What is a user agent used for?
Servers and analytics platforms read user agents to log browser statistics, serve device-appropriate content, and identify bots and crawlers.
How do I know if a user agent is from a bot?
Bots often include words like bot, crawler, spider, or the name of the service in their user agent string. The tool will flag common bot patterns.