SEO & Web

9 free online tools — Meta tags, DNS, headers and site analysis

Tools for the technical side of running a website: write correct meta and Open Graph tags, preview how a page looks in Google, generate robots.txt and clean URL slugs, and diagnose the plumbing — DNS records, WHOIS ownership and expiry, SSL certificate validity and chain, HTTP response headers and redirects, and what an IP address belongs to.

IP Lookup — What Is My IP Your public IP instantly, and network details for any address or hostname. WHOIS Lookup Who registered a domain, when it expires, and where it's managed. DNS Lookup A, AAAA, MX, TXT, NS and more — the public answer, not your ISP's cached one. robots.txt Generator Presets, path rules and AI-crawler opt-outs — with the syntax mistakes designed out. SSL Checker Expiry, trust, covered names and the full chain — including certificates your browser refuses to show you. SERP Preview See your title and description as Google shows them — truncated by pixels, not characters. URL Slug Generator Turn "How to Make Crème Brûlée (2026)" into how-to-make-creme-brulee-2026 — accents, symbols and other alphabets handled, one title or a hundred. HTTP Header Checker See any site's response headers, redirect chain and security header grade. Meta Tag Generator Generate title, description, Open Graph and Twitter card tags with live previews.

On-page

The meta tag generator writes the title, description, canonical, Open Graph and Twitter tags in one block; the SERP preview shows the snippet with real pixel-width truncation, which is how Google actually cuts titles; the slug generator turns any title into a clean URL, accents and other alphabets handled; the robots.txt generator builds the file with the AI-crawler opt-outs people now ask for.

Diagnostics

DNS lookup queries every record type fresh from a public resolver; WHOIS follows the real registry referral chain and falls back to RDAP where registries have retired port 43; the SSL checker inspects even expired and self-signed certificates that browsers hide, then reports trust separately; the header checker shows the status code, redirect chain and every response header; IP lookup gives the network owner and reverse DNS without geolocation guesswork. The status code reference explains whatever those return.

These tools do talk to the network

Unlike most of the site, the lookups have to reach out — to DNS servers, registries and the site you are checking. They do so from this server, never from your browser, so your own IP is not exposed to the target, and results are not stored beyond a short cache.