Decoding a User-Agent string usually means searching for patterns or using a library. The User Agent Parser does it in the browser: paste any UA string (or use your current browser's) and see browser, OS, device type, and bot detection—no sign-up; parsing is client-side.
What does the user agent parser do?
User Agent Parser parses a User-Agent string and shows browser name/version, OS, device type, and whether it looks like a bot. Paste any UA or use your current browser's. All parsing is client-side. It detects browser name/version, operating system, device type, rendering engine, and bot detection. You can paste any user agent string to analyze it, or use your current browser's agent. Parsing runs in your browser; if you use "current browser," that string is only used locally to show parsed fields. Use it to debug device detection, see what a crawler or client reports, or check how your site will classify a given UA. New or custom clients may not be in the parser's database—the raw string is still shown for manual inspection if the browser or OS is unknown.
Key Features
- Parsed fields — Browser name/version, OS, device type, rendering engine, bot detection.
- Test any UA — Yes. Paste any user agent string to analyze it, or use your current browser's agent.
- Privacy — Parsing runs in your browser. If you use "current browser," that string is only used locally to show parsed fields.
- No account — Use as often as you need without sign-up.
- Unknown — User-Agent strings vary; new or custom clients may not be in the parser's database. The raw string is still shown for manual inspection.
- Client-side — All parsing is client-side when implemented.
How to Use the User Agent Parser
- Open the User Agent Parser tool.
- Paste a User-Agent string or click to use your current browser's. View parsed browser, OS, device, and bot flag.
- Use the "Use tool" button on the docs page if you are reading this from the documentation.
Real Use Cases
- Debug device detection — See how your site or script would classify a UA. Test mobile vs desktop, bot vs browser.
- Crawler identification — Paste a crawler's UA from logs. Confirm bot detection and name/version.
- Support — User reports "site looks wrong." Have them paste UA; parse and identify browser/OS.
- Analytics — Understand what "Chrome on Windows" or "Safari on iPhone" means for a given UA string.
- Testing — Verify that a spoofed or custom UA is parsed as expected. Compare with IP Info Lookup for request context.
- Documentation — Show example parsed output for docs or tickets.
Why Use the User Agent Parser Instead of Alternatives?
- vs. IP Info Lookup — IP Info Lookup shows IP location/ISP. This tool parses the User-Agent header. Use both for request context.
- vs. JSON Formatter — JSON Formatter formats JSON. This tool parses UA. Different purpose.
- vs. Base64 Encoder — Base64 Encoder encodes/decodes. This tool parses UA. Use the right tool for the job.
- vs. Manual lookup — No need to search for UA patterns. Paste, view parsed result.
New or custom clients may not be in the parser's database. The raw string is still shown for manual inspection if the browser or OS is unknown.
Benefits for Developers, Support, and DevOps
- Developers — Debug device/browser detection. No server round-trip when client-side.
- Support — Identify client browser/OS from a pasted UA. No logging required.
- DevOps — Verify crawler or bot UAs from logs.
Common Mistakes
- Browser or OS unknown — User-Agent strings vary; new or custom clients may not be in the parser's database. The raw string is still shown for manual inspection.
- Expecting IP — This tool parses UA only. For IP details use IP Info Lookup.
- Trusting UA for security — UA can be spoofed. Use for analytics and UX, not for access control.
- Forgetting to copy — The result is not saved. Copy before closing the tab.
Frequently Asked Questions
What does the user agent parser do?
It parses a User-Agent string and shows browser name/version, OS, device type, and whether it looks like a bot. Paste any UA or use your current browser's. All parsing is client-side.
Browser name/version, operating system, device type, rendering engine, and bot detection.
Can I test different user agents?
Yes, paste any user agent string to analyze it, or use your current browser's agent.
Is my user agent sent to a server?
Parsing runs in your browser. If you use 'current browser', that string is only used locally to show parsed fields.
When should I use a user agent parser?
Use it to debug device detection, see what a crawler or client reports, or check how your site will classify a given UA.
Why is the browser or OS unknown?
User-Agent strings vary; new or custom clients may not be in the parser's database. The raw string is still shown for manual inspection.
User Agent Parser gives you parsed UA in seconds: paste or use current, view result. No account; client-side when available. For IP details use IP Info Lookup, for JSON use JSON Formatter, and for encoding use Base64 Encoder.
Use the User Agent Parser tool to decode user agent strings.