Herramientas de seguridad y sitios web

A full website health check in a few minutes

A website can look fine in your own browser and still have problems that cost visitors and rankings: an SSL certificate that expires next week, a redirect chain that adds a second to every page view, missing security headers, a robots.txt that blocks AI crawlers, or a title tag that search engines truncate. These tools check those things from the outside, the same way search engines and browsers see your site.

Suggested order for an audit

1. Is It Down? and the Redirect Checker: confirm the site answers and that http://, www and non-www versions end on one canonical HTTPS URL in a single hop.
2. SSL Certificate Checker and HTTP Headers Checker: certificate validity, chain and expiry, then HSTS, CSP and other security headers.
3. Website Speed Test: server response time, page weight and the biggest speed wins.
4. SEO Checker and AI Search (GEO) Checker: on-page SEO, structured data, and whether ChatGPT, Perplexity and Google's AI features can read and cite the page.
5. WHOIS Lookup and Website Location & Hosting Checker: who registered the domain, when it expires, and where the site is hosted.

For your own safety, the Phishing Email Analyzer checks a suspicious message for spoofed senders and dangerous links, the Blacklist Checker shows whether your IP is listed by spam blocklists, and the WebRTC Leak Test confirms your VPN is not leaking your real address.

All scans are passive: they request public pages the way a browser does and never attempt to break in. Network diagnostics such as ping, DNS and port checks are in our network tools.

Guías

• What Is DNS and How Does It Work?: DNS explained step by step: resolvers, root and TLD servers, caching, TTL, and why DNS changes take time to propagate around the world.
• DNS Record Types Explained: A, AAAA, CNAME, MX, TXT and More: A practical guide to DNS record types including A, AAAA, CNAME, MX, NS, TXT, SOA, CAA, SRV and PTR, with examples of when to use each.
• What Is Reverse DNS (rDNS) and Why It Matters: Reverse DNS explained: PTR records, in-addr.arpa, forward-confirmed reverse DNS, and why mail servers reject email without valid rDNS.
• What Is WHOIS? Domain Lookup, RDAP and Privacy: What WHOIS data shows, how RDAP is replacing it, why most owner details are redacted, and how to use WHOIS to research a domain or IP address.
• Qué es un certificado SSL/TLS y cómo funciona: Certificados SSL y TLS explicados: cómo funciona HTTPS, DV, OV y EV, cadenas de certificados, caducidad y cómo corregir los errores más habituales.
• SPF, DKIM and DMARC Explained: How SPF, DKIM and DMARC protect your domain from email spoofing, with example records, a rollout plan, and fixes for common errors.

Todas las guías

Preguntas frecuentes

Which website checks are available?

Phishing email analysis, SSL certificate and HTTP header checks, redirect and uptime checks, blacklist and WebRTC leak tests, SEO and speed audits, AI-search (GEO) readiness and WHOIS and domain availability lookups.

Can I check a website I do not own?

You can run the passive checks on any public website: they read what the site already shows to every visitor.

Are the results stored?

No. Results are shown to you and are not kept as a history.