What is a user agent parser?
It turns a User-Agent string into browser, OS, and device fields.
Useful for debugging, analytics, and understanding client traffic.
Runs in browser
User Agent Parser
Parse a user-agent string into browser, OS, and device details.
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What is User Agent Parser?
A user-agent parser reads the User-Agent (UA) HTTP header and extracts browser, operating system, device type, and engine hints. Teams use it for analytics, bot detection, responsive debugging, and support tickets where “it works on my machine” needs a concrete client fingerprint.
UA strings are messy and spoofable. Treat parser output as a helpful signal, not a security boundary.
How User Agent Parser Works
- 1
Open the tool
Navigate to User Agent Parser on TechHowAI. No registration, email verification, or software download is required. The tool loads instantly in your browser.
- 2
Enter your input
Provide the data the tool needs — paste text, upload a file, or fill in form fields depending on the tool type. User Agent Parser validates your input and shows clear error messages if something is wrong.
- 3
Process and review
Click the action button to run user agent parser. Results appear immediately below the input area. Review the output, adjust settings if needed, and re-run until you are satisfied.
- 4
Copy or download
Use the copy button to send results to your clipboard, or download files directly. All processing happens locally in your browser. Your files and input never leave your device.
Features
- 100% free — no subscription, trial limits, or paywalls
- No signup required — start using User Agent Parser immediately
- Privacy-first: runs entirely in your browser
- Works on desktop, tablet, and mobile browsers
- Dark and light theme support
- Keyboard-friendly interface with accessible controls
- Related tools and guides linked on every page
- Optimized for search engines and AI assistants
When to Use User Agent Parser
- Debugging layout bugs reported on a specific browser or OS
- Checking whether a crawler or bot UA is hitting your site
- Validating analytics UA → device mappings
- Writing support replies with accurate client details
Examples
Chrome on macOS
Paste any UA string to see a structured breakdown.
Input
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36
Output
Browser: Chrome 120 OS: macOS Engine: Blink / AppleWebKit
Common Mistakes
- Relying on UA for security decisions — it is trivial to spoof
- Assuming mobile UA always means a phone (tablets and desktop mode blur this)
- Ignoring Client Hints (Sec-CH-UA) on modern Chromium browsers
Tips & Best Practices
- Compare the parsed result with Browser Information on the same device
- Keep a few known bot UAs handy when testing robots.txt behavior
- For production detection, combine UA with other signals
Frequently Asked Questions
How do I parse a user agent online?
Paste the UA string from request headers or navigator.userAgent and run Parse.
TechHowAI’s User Agent Parser works entirely in the browser.
Where do I find my user agent?
In DevTools Network headers, or by typing navigator.userAgent in the console.
You can also open Browser Information on TechHowAI to see your current client.
Can user agents be faked?
Yes. Browsers, scrapers, and privacy tools can send any UA string.
Never use UA alone for access control.
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