Free SEO Tools
The original searchengineoptimising.com tools served over a million requests a month. We're rebuilding them as Cloudflare Workers — fast, free, no signup, no logging. 16 live, more on the way.
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HTML Validator
Check the markup of any URL against the W3C HTML specification. Powered by the Nu Html Checker.
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Search Engine Submission
How submission actually works in 2026 — Google Search Console, Bing Webmaster Tools, and IndexNow in one cURL.
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Broken Link Checker
Crawl a page and report any links that 404, time out, or hit a soft error. Up to 150 links per check.
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Reverse DNS Lookup
Resolve an IPv4 or IPv6 address back to its hostname via PTR records.
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Speed Test
Measure latency, download, and upload throughput between you and the nearest Cloudflare edge.
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Meta Tag Analyser
Inspect title, description, canonical, robots, Open Graph, and Twitter cards for any URL.
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Google Suggest Scraper
Pull live Google autocomplete suggestions for any seed keyword. A–Z fan-out for long-tail keyword research.
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HTTP Header Viewer
Inspect the HTTP response headers, status codes, and redirect chains for any URL.
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WHOIS Lookup
Look up the registration record for any domain via RDAP — registrar, expiry, nameservers, status.
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IP WHOIS
Look up the registered owner of any IPv4 or IPv6 address via the Regional Internet Registry RDAP.
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Domain Info
One-glance domain summary — registrar, age, expiry, nameservers, A/AAAA, MX records.
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DNS Query
Query A, AAAA, MX, TXT, CNAME, NS, and other DNS records for a domain.
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What is my IP?
Show your current public IP address, with a few useful headers from your request.
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Search Engine Spider Test
Fetch any URL with the Googlebot UA and no JS — see the title, headings, visible text, and links a crawler actually receives.
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Meta Tags Generator
Generate a clean set of meta tags from a few simple inputs (title, description, keywords).
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List Cleaner
Dedupe, trim, sort, and clean a list of lines — keywords, URLs, emails. Pure browser JS, nothing uploaded.
Retired tools
These three tools relied on APIs that were discontinued years ago. The slugs still resolve to short explainer pages with the modern equivalents, so the inbound links stay useful.
- Link Popularity Check — The Yahoo / Altavista link: operator both went away. The page now explains what “link popularity” means in 2026 and where to measure it.
- Backlink Checker — The original used Yahoo Site Explorer (closed 2011). The page now lists the modern free options for backlink data.
- PageRank Checker — The Toolbar PageRank API was killed in 2016. The page now explains what replaced PageRank as a public link-equity signal.