DNS
Resolvers can return different cached records depending on geography, TTL and propagation state.
Network & Web Tools
Pro diagnostic reportUser Agent Parser Online Free
Parse one or many browser user-agent strings to identify likely browser, OS, device type and engine family, with bulk CSV export.
Diagnose
Run a bounded public check.
Understand
See a health score and explanation.
Act
Follow prioritized recommendations.
User-agent analysis workspace
Browser onlyInspect one user agent in detail or parse up to 500 newline-separated user-agent strings for QA, log review and device/browser summaries.
Single user agent
0 charsBrowser
Other or unknown
Unknown
Operating system
Other or unknown
Unknown
Device class
Desktop
Engine family
Unknown
Bulk user-agent parser
Paste one user agent per line or load a TXT/log extract. Processing remains local.
User-agent parsing is heuristic. User agents can be spoofed or reduced for privacy. Do not use the result as authentication, fraud proof or the sole basis for capability decisions.
About this tool
A user-agent string is sent by browsers to describe aspects of the client environment. This parser provides a simple browser-side interpretation of common strings. Modern user agents can be intentionally generic and should not be treated as a reliable identity or security signal.
Common use cases
- ✓ Inspect the user agent reported by your current browser.
- ✓ Review a user-agent value copied from logs.
- ✓ Test basic desktop, tablet and mobile classification.
- ✓ Explain browser-identification concepts during debugging or training.
How to use it
- Use the automatically detected string or paste another user agent.
- Review the likely browser, operating system, device and engine.
- Compare the result with actual device information when accuracy matters.
- Avoid using user-agent parsing as the only feature-detection method.
Important interpretation notes
- • User-agent detection is heuristic and can be spoofed.
- • Browsers increasingly reduce identifying detail for privacy.
- • Use capability detection for application behavior whenever possible.
Professional interpretation guide
Understand and verify your user agent parser results
Use the result as a focused diagnostic signal. Verify important findings before changing DNS, hosting, security, caching or application configuration.
What the result tells you
- ✓ Browser and engine fields are inferred from the supplied user-agent string.
- ✓ Operating-system and device categories are best-effort classifications.
- ✓ Bot detection relies on recognizable tokens and is not definitive.
How to verify it
- Compare with the browser's own diagnostics.
- Test representative user agents from real logs.
- Use feature detection instead of browser detection for application behaviour.
Network diagnostics
Interpret results in the correct protocol layer
Network tools observe different layers: DNS resolves names, TCP establishes connections, TLS authenticates encrypted sessions and HTTP carries requests, redirects, headers and caching rules. A successful result at one layer does not prove that the complete website or application is healthy.
TLS
Certificate validity, hostname matching, trust chains and protocol support are separate checks.
HTTP
Status codes, redirect chains, headers and caching directives describe application behaviour.
Measurement context
Latency and reachability vary by location, network path, browser and time.
What the operation can change
- A cached DNS answer may differ from an authoritative nameserver response.
- A 200 status code can still return the wrong content or an application error page.
- A valid certificate does not prove the website itself is trustworthy.
- Security-header tools report configuration, not complete vulnerability coverage.
Domain-specific verification
- Repeat tests from another network or resolver when location matters.
- Check the final URL and every redirect hop.
- Confirm timestamps, certificate names and expiry dates.
- Use browser developer tools and server logs for production incidents.
Common mistakes to avoid
- • Treating parsed versions as guaranteed facts.
- • Blocking users solely from user-agent classification.
- • Assuming all bots identify themselves honestly.
Privacy and safe use
Parsing happens locally in the browser. A user-agent can still reveal device and software details, so avoid sharing sensitive logs unnecessarily.
Limitations
- • User-agent strings can be spoofed or reduced for privacy.
- • New browsers and devices may be classified generically until parser rules evolve.
Continue the diagnostic workflow
Combine related checks instead of relying on one isolated result.
Related Network & Web Tools
Frequently asked questions
What is a user-agent string?
It is an HTTP header value that describes the client software in a conventional text format.
Can a user agent identify a person?
No. It describes software and device characteristics, not a verified individual identity.
Can user agents be changed?
Yes. Browsers, extensions, automation tools and proxies can modify them.
Why does Chrome mention Safari?
User-agent strings retain historical compatibility tokens expected by websites.
Should I use user-agent detection for responsive design?
Usually not. CSS media queries and feature detection are more reliable.
Is the parsing done locally?
Yes. This parser runs in the browser and does not need the network API.