About SiteIndex
SiteIndex is a collection of free online tools for website owners, developers, businesses, and everyday internet users. It covers Internet & Network, Website & Domain, Developer, and Utilities tasks.
Many tools run in the browser, including data formatting, conversion, document, and generator tools. Network and website checks may send a public target to a SiteIndex endpoint so the server can make a request that browsers cannot make directly.
Results are practical diagnostics, not guarantees or professional advice. Tool pages explain their method and limitations, and no account is required for the public tools.
Use related checks to investigate a problem
A DNS lookup shows records returned for a domain, while a propagation check compares answers from multiple resolvers. A public availability check and an internet connection speed test measure different things, so a result from one should not be treated as proof of the other.
For a launch or incident, start with the symptom, use the focused checks that apply, and compare results under similar conditions. The documentation links each guide to relevant tools and describes what the checks can and cannot establish.
Understand the scope of a result
Network and website results describe the public target, route, and moment tested. They do not replace monitoring from your users' locations, a complete site crawl, a browser performance trace, or a specialist security review. Check each tool's limitations before using its output to make a decision.