Useful, legible, quietly opinionated.

Web Diagnostic Tools is an independent pilot for site owners who need a quick answer and enough context to act safely.

Our editorial line

We explain the observable layer first: what a resolver returned, what a server answered, what a crawler can request. We separate facts from recommendations and mark uncertainty rather than filling it with confidence.

Our tools

The DNS checker runs in your browser against a public DNS-over-HTTPS resolver. It does not ask for a login or collect a domain history. It is not a substitute for your authoritative provider, mail logs or production monitoring.

Questions, corrections and accessibility notes belong on the Contact page.