DNS and Domain Tools
Check DNS records, WHOIS/RDAP data, propagation, IPs and reverse DNS.
View ToolsFree website diagnostics
Free Website Tools
Run practical checks before a migration, launch, DNS change or support request. Each tool gives a plain-English summary, technical detail and recommended next steps.
Browse ToolsChoose a diagnostic category
Start with the area you want to investigate, then run the specific check that matches the issue.
Email Deliverability Tools
Check MX, SPF, DKIM, DMARC, MTA-STS, TLS-RPT, BIMI and blacklist status.
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Website Security Tools
Check SSL certificates, security headers and common public ports.
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SEO Audit Tools
Check meta tags, robots.txt, sitemaps, schema, links, headings and more.
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Performance and Uptime Tools
Check uptime, page size, compression and browser cache headers.
View ToolsAll free diagnostic tools
Find the check you need for your website, domain or email.
DNS and Domain Tools
WHOIS / RDAP Lookup
Look up public registration data, domain status, important dates and nameservers.
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DNS Lookup
Query public DNS records for a domain and explain what is present or missing.
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DNS Propagation Checker
Compare answers from Cloudflare, Google and Quad9 resolvers.
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IP Lookup
Resolve domains to public IP addresses or check reverse DNS for an IP.
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Reverse DNS Checker
Check PTR records and reverse DNS guidance for public IPs.
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MX Checker
Find mail exchanger records and priorities for a domain.
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SPF Checker
Find and analyse SPF records for sender authorisation.
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DKIM Checker
Check a DKIM selector under selector._domainkey.domain.
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DMARC Checker
Check DMARC policy, reporting tags and enforcement readiness for your domain email.
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MTA-STS Checker
Check MTA-STS DNS and policy file availability.
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TLS-RPT Checker
Check SMTP TLS reporting records for delivery encryption visibility and MTA-STS support.
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BIMI Checker
Check default BIMI DNS record and DMARC readiness guidance.
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Email Blacklist Checker
Check a public mail IP against common DNSBL zones.
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SSL Checker
Inspect the TLS certificate served on port 443.
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Security Headers Checker
Check important browser security headers.
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Port Checker
Check whether a selected public TCP port appears open.
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Uptime Checker
Request a URL and report status, response time and redirect hops.
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Meta Tag Analyser
Review title, description, canonical, robots and viewport meta tags.
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SEO Snapshot
Run focused checks for metadata, headings, crawl signals, schema, links and images.
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Robots.txt Checker
Fetch and summarise a site robots.txt file.
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Sitemap Checker
Find sitemap.xml or sitemap_index.xml and count entries.
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Redirect Checker
Trace URL redirects, show each hop and flag chains that can slow SEO crawls or migrations.
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Open Graph Checker
Check Open Graph and Twitter card tags for stronger social previews and shared links.
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Schema Markup Checker
Parse JSON-LD schema markup and report types or errors.
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Broken Link Checker
Check up to the first 10 links on a page.
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Page Size Checker
Measure fetched HTML size and flag unusually large pages.
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HTTP Compression Checker
Check whether HTTP compression is enabled.
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Cache Headers Checker
Check browser cache headers and identify caching signals that affect repeat visits and speed.
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Image Alt Text Checker
Find images missing alt text so accessibility and image SEO issues can be prioritised.
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Heading Structure Checker
Review the H1-H6 page outline and H1 count for accessibility, structure and SEO clarity.
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Canonical Tag Checker
Detect canonical link tags and duplicate/missing canonicals.
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Hreflang Checker
Find alternate language hreflang links and highlight missing international SEO signals.
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Found an issue in a diagnostic result?
Send us the tool result, domain and current host. We can help prioritise DNS, email, SSL, SEO and hosting fixes before you migrate or upgrade.
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- SEO and performance priorities
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