User Agent Parser Online
Professional user agent parser online. Detect browser, OS, and device details from any user agent string instantly.
Built With Care
“Parsing is powered by ua-parser-js, an open-source library that matches user agent strings against thousands of browser, engine, OS, and device patterns. Everything runs in your browser, and the raw JSON analysis is shown so you can verify every detected field.”
User Agent Parser & Browser Info
A free user agent parser that identifies the browser, operating system, device, and rendering engine behind any user agent string. Your current browser is parsed automatically on load, and you can paste any other UA string for instant device and version detection.
- 1Load the page and your current user agent string is parsed automatically.
- 2Read the Browser, OS, Device, and Engine cards for the identified details.
- 3Paste any other user agent string into the text area to analyze a different client.
- 4Click 'Parse UA String' to run the analysis on your pasted value.
- 5Review the raw JSON below to see every field the parser resolved.
- 6Use the copy button to grab the original UA string for bug reports.
- Instant Auto-Parse: Your current browser is analyzed as soon as the page loads.
- Four-Field Breakdown: Browser, operating system, device, and rendering engine with versions.
- Raw JSON Output: Complete parser results for verification and debugging.
- Library-Backed: Uses ua-parser-js, maintained with thousands of UA patterns.
- Client-Side Parsing: The UA string is parsed in your browser — not sent to a server.
- Copy Support: One click copies your current UA string for reports.
User Agent Parser & Browser Info Specs
Limits
- Single UA string per parse
- Standard browser + OS + device detection
Formats
- Output: browser, OS, device, engine fields
Defaults
- Current browser's UA auto-detected
How it works
- ua-parser-js
Honest caveats
- Bots and crawlers are not specifically identified
- Custom UA strings may have missing fields
Real Ways People Use This
Browser Compatibility Testing
Check how your site identifies a phone, tablet, or desktop user agent during responsive development.
Security Auditing
Inspect suspicious user agent strings to identify crawlers, bots, or spoofed identities.
Analytics Debugging
Verify that analytics data classifies browsers and devices correctly by testing known UA patterns.
Support Troubleshooting
Ask a user for their user agent string and see exactly which browser and OS version they run.
Feature Detection Planning
Confirm which rendering engine a visitor's browser uses to plan feature support logic.
- User-agent strings can be spoofed by browsers or extensions. Treat parsed results as indicative, not definitive.
- Some modern browsers send simplified UA strings that may not reveal full device information.
- Parsing is based on common UA patterns. Uncommon or custom user agents may not parse correctly.
- 1Confirm the parsed browser and OS match the device you expect.
- 2For reports, copy the raw UA string along with the parsed output.
- 3Re-parse after switching browsers or using emulation tools to compare results.