Free Tools by UnderHost

Check expiry date, issuer, SANs, trust chain, key strength, and HTTPS connectivity for any domain.

Full email configuration audit: MX, SPF, DKIM, DMARC, A/AAAA records, and common misconfiguration warnings.

Audit MX, SPF, DKIM, DMARC, MTA-STS, TLS-RPT, BIMI, PTR hints, and provider-ready mail authentication.

Check public DNS records, resolver propagation, nameservers, CAA, DNSSEC, and migration readiness signals.

Follow every HTTP redirect hop, see status codes and timing per hop, detect loops and long chains.

Review domain DNS, nameservers, RDAP status, expiration signals, CAA, DNSSEC, and mail readiness in one view.

Probe HTTP status, final URL, DNS timing, connection timing, TLS timing, TTFB, and public resolver visibility.

See how any URL looks when shared on Facebook, Twitter/X, and LinkedIn. Full OG tag audit included.

Google PageSpeed Insights scores for mobile and desktop. LCP, CLS, TBT, FCP, TTI with top opportunities.

Audit HSTS, CSP, X-Frame-Options, XCTO, Referrer-Policy, and Permissions-Policy. Get an instant letter grade.

Check URLs, domains, IPs, and file hashes against VirusTotal reputation and malware intelligence.

Passive WordPress hardening checks for XML-RPC, readme leakage, directory listing, REST exposure, HTTPS, and headers.

Scan a page for insecure HTTP assets, forms, CSS URLs, canonical issues, and HTTPS upgrade problems.

Check public IPv4 addresses or domain A records against common DNSBL reputation lists used in mail filtering.

Check common hosting, mail, panel, database, and cache ports on public hosts using a fixed safe port list.

Complete SEO audit with a score out of 100. Checks title, meta, headings, canonical, Open Graph, Twitter Cards, robots.txt, sitemap, schema, images, and more.

Meta tag generator, keyword density analyzer, robots.txt tester, and XML sitemap validator - four tools in one.

See exactly how your page appears in Google, Bing, and mobile search results. Title and description length meters.

Audit title, description, H1, canonical, robots, viewport, Open Graph, structured data, and image alt tags.

Extract and inspect all JSON-LD structured data on any page. View schema types and rich result eligibility.

The honest 2026 guide to getting indexed. Sitemap check, robots.txt scan, and step-by-step for Google, Bing, Yandex.

WCAG contrast checker, CSS gradient generator, box shadow builder, and border radius designer - all client-side.

Build and validate cron expressions visually. Human-readable description, next 5 run times, and cPanel commands.

Generate starter security.txt, robots.txt, and llms.txt files for website security contacts, crawlers, and AI assistants.

Step-by-step guides for white screens, 500 errors, database issues, email, security, caching, and backups.

Preflight a website before moving hosts: DNS TTL, website response, mail records, CMS signals, and cutover checklist.

Request a free migration to UnderHost. We handle WordPress, cPanel, databases, email, and custom platforms.