Free web tools
SSL Certificate Check
Check if your domain's SSL certificate is valid and when it expires. An expired certificate shows a browser warning ("Not Secure") and hurts your search ranking.
Check SSL Certificate Online
Our tool shows whether your SSL/TLS certificate is valid, who issued it, and when it expires. An expired cert means a "Not Secure" browser warning and lower search ranking.
Check Site Availability (Ping)
Send an HTTP request and measure response time. If your site is unreachable for you, it could be a local ISP issue — our service shows objective availability from an external data center.
DNS Lookup
Look up DNS records for any domain. View A, AAAA, MX, NS, TXT, CNAME, and SOA records instantly.
HTTP Headers Check
Inspect HTTP response headers and security score for any website. Check HSTS, CSP, X-Frame-Options, and more.
Port Checker
Check if a TCP port is open on any host. Test common ports like 80, 443, 22, 3306, 5432.
WHOIS Lookup
Look up domain registration info. Find registrar, creation date, expiry, and nameservers.
SSL/TLS deep audit
Goes further than just expiry: probes which TLS protocol versions your server still accepts (TLS 1.0/1.1 are broken), what cipher you negotiate, whether HSTS is set, whether the certificate chain is sane. Grade A-F like SSL Labs.
DNS propagation across 10 resolvers
Just changed an A/CNAME record? See how it looks from Cloudflare, Google, Quad9, OpenDNS, AdGuard, Yandex and four more public resolvers. If they disagree, propagation is still in progress.
Mixed content scanner
Fetches an HTTPS page and scans for any http:// resources — scripts, images, iframes — that would break the padlock. Common after a half-finished migration to HTTPS.
Sitemap.xml validator
Parses your sitemap or sitemap-index, counts URLs, validates the XML, and flags missing lastmod tags. The first thing to check when Search Console says it can't read your sitemap.
Speed test
Streams a payload from the same origin we use for monitoring and measures real download bandwidth. Useful when you want to compare your connection against the route Valpero takes to your server.
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