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SiteIndex

Website & Domain Tools

Inspect website status, HTTP responses, headers, SSL certificates, and domains. Pick a tool below to open it.

10 Tools

Website & Domain

Inspect website status, HTTP responses, headers, SSL certificates, and domains.

10 tools
Domain CheckerCheck domain availability, status, and structure in a simple browser-based validator.HTTP Status CheckerCheck the HTTP response for a URL and review the status, server, and redirect chain.Is My Website Down?Test if a site is reachable and quickly review the response status and timing.Website ScoreMeasure a public website's SEO, performance, accessibility, security, and technical health.Website Speed TestTest how fast a website loads: time to first byte, DNS, connection, TLS, download time, page size, compression, and render-blocking resources.Website Health OverviewReview the key status, performance, security, and SEO signals of a public website in one view.Headers CheckerReview HTTP response headers for caching, content type, security, and debugging information.SSL CheckerCheck an SSL certificate's expiry date, issuer, covered hostnames, chain of trust, and TLS version for any domain.Heading ExtractorFetch a public page and list its title, meta description, and H1–H6 heading structure in order.OGP CheckerFetch a public page and review its Open Graph and Twitter/X card tags with a social preview.

Inspect a public website from the outside

Website diagnostics send the public target to SiteIndex endpoints so the server can inspect responses, certificates, or page metadata. Remote previews can also request external images. These are not entirely local browser tools. Do not include credentials, signed private links, or confidential information in a target.

Website Score summarizes observable signals on one page and selected same-site resources; it is not a search ranking or certification. SSL Checker inspects the certificate seen on the server connection. Timing and availability results describe the tested network path, not every region or visitor.

Who these tools help

Site owners and developers can review response headers, initial HTML, certificates, and social metadata before or after a change. JavaScript-rendered content, authenticated pages, bot challenges, and intermittent failures can limit a check. Use only public targets you are authorized to inspect.

Review results in context

Launching something new? Start with the intended URL, then compare the relevant status, certificate, and metadata findings with the actual deployment. Recheck after changes and investigate any timeout rather than treating it as a definitive outage. Hosting and diagnostic logs can include public targets and error details; optional analytics and ads are separately consent-gated.

Frequently asked questions

What does the Website Score measure?
The Website Score is a diagnostic summary of publicly observable signals across five categories: SEO, performance, accessibility, security, and technical health. It analyzes one public page plus the same site's robots.txt and sitemap resources, then applies category weights to produce an overall score. Note that it is not a Google ranking score — it's a starting point for finding fixable issues, not a certification.
How do I check if a website is down for everyone or just me?
Use the Is My Website Down? tool to check the response from SiteIndex's server path. A successful response there does not prove the site is available to everyone: location, DNS, firewall rules, caching, and intermittent failures can differ. Compare it with your device and another authorized check before concluding where the problem lies.
How can I check when an SSL certificate expires?
Enter the domain in SSL Checker. It shows the certificate's expiry date along with its issuer, the hostnames it covers, the chain of trust, and the TLS version in use. Since expired certificates trigger browser warnings that drive visitors away, it's worth checking before renewal deadlines — many certificates are valid for only 90 days.
What are HTTP security headers and why do they matter?
HTTP security headers are response headers that tell browsers how to handle a page safely — for example, Content-Security-Policy, Strict-Transport-Security, and X-Frame-Options. They help defend against clickjacking, protocol downgrade attacks, and certain code-injection risks. Headers Checker reviews a site's response headers for caching, content type, security, and debugging information so you can spot what's missing.
How do I preview how my page looks when shared on social media?
Use OGP Checker. It fetches your public page, reads its Open Graph and Twitter/X card tags, and shows a social preview of the title, description, and image. If the preview looks wrong or empty, the fix is usually a missing or malformed meta tag in the page's HTML.
How often should I audit my website?
Re-run a full check after every major change — a redesign, a migration, new plugins, or a theme update — and at least every few months in between. Certificates expire, headers change with server updates, and new content can introduce slow pages or broken metadata. Website Score and Website Speed Test make it quick to re-baseline, and Website Health Overview gives you a single snapshot to compare against.