SEO Report Tools

Webmaster Utilities · Runs in your browser · Free

User-Agent Parser

Identify the browser, operating system, device type and known crawler from a user-agent string.

What this tool does

Reads a user-agent from your logs and tells you whether it is a known search or AI crawler, or which browser and OS it indicates.

Who should use it

SEOs reading server logs and webmasters investigating crawl traffic.

How it works

The string is matched against patterns for common crawlers (Google, Bing, OpenAI, Anthropic, Perplexity, social previews) and for major browsers, operating systems and device keywords.

How to use it

  1. Enter or paste user-agent string in the form.
  2. Use "Load example" if you want to see how input should look.
  3. Press the run button. Processing happens instantly in your browser.
  4. Review the result panel, then copy or download the output if the tool offers it. Use Reset to start over.

Practical example

A string containing "Googlebot/2.1" is recognised as Google Search's crawler.

Understanding the results

A bot label only means the string claims that identity.

Limitations

User-agents can be faked. Verify Googlebot by reverse DNS plus forward confirmation. Pattern-based detection is not exhaustive.

Accuracy and report transparency

Results are computed in your browser from exactly what you enter. Deterministic steps (counting, parsing, encoding, validation) are verified by an automated test-suite with known answers. Where a method is a heuristic, the result panel says "estimated". No external data is used and nothing is invented.

Privacy

Your input never leaves your device for this tool. We count anonymous events (tool opened, run, copied) without storing what you typed. See the Privacy Policy.

Try these next

Robots.txt TesterTest whether paths are allowed or blocked for a crawler using Google's robots.txt matching rules.HTTP Header CheckerSee the exact HTTP response headers a URL returns, with notes on SEO-relevant ones.IP Address LookupResolve a domain to its IPv4 and IPv6 addresses and read their reverse DNS names.

Frequently asked questions

How do I verify a real Googlebot?

Reverse-resolve the IP to a googlebot.com or google.com hostname, then resolve that hostname forward and check it returns the same IP.

Is my data sent to your server?

No. This tool runs entirely in your browser, so the text or files you enter stay on your device. We do record anonymous counts of how often each tool is opened or run (no input data) to see which tools are useful.

How accurate are the results?

Counting, parsing, encoding and validation steps are deterministic and covered by automated tests with known answers. Anything based on a heuristic is labelled "estimated" in the result panel.

Is this tool really free?

Yes. There is no account, limit or paid plan. The site is supported by advertising, which is disclosed on our Advertising Disclosure page.

References