--- title: "Free Website Tools — SSL Checker, DNS Lookup, Security Headers & More — Lemwatch" description: "Free online tools to check SSL certificates, security headers, DNS records, meta tags, carbon footprint, and more. Instant results, no signup required." canonical: "https://lemwatch.com/tools" source: "https://lemwatch.com" --- # Free website diagnostic tools > Seven single-shot checks you can run without an account — SSL, DNS, security headers, meta tags, mixed content, carbon footprint, and SPF/DKIM/DMARC. ## Run a check without an account Every tool here is a single-shot check: paste a domain, get a result. No signup, no card, no email wall. They're the same checks Lemwatch runs on a schedule for monitored sites, exposed one at a time so you can use them ad hoc. ## What each check tells you SSL shows certificate validity, issuer, chain problems and days to expiry. DNS resolves A, AAAA, MX, NS and TXT records. Security headers grade your CSP, HSTS and frame protections. Meta tags surface title, description, canonical and robots directives. Mixed content finds insecure assets on HTTPS pages. Email DNS checks SPF, DKIM and DMARC alignment. ## When a one-off check isn't enough A single check tells you the state right now. Most problems — a certificate expiring, a DNS record changed, a noindex shipped by mistake — only matter when they change. That's what continuous monitoring is for, and it's free for a small portfolio. ## Lemwatch at a glance - What it is: website monitoring that checks uptime, page changes, SEO, security, SSL and speed in one tool. - Free plan: 10 sites, no time limit, all check types. - Pro: $19/mo, 50 sites, public API and webhooks. - Agency: $59/mo, 150 sites, white-label status pages. - Source: https://lemwatch.com/pricing (facts verified from the product's own plan limits). ## All 78 pages in this section - [Is cloudflare.com down right now?](https://lemwatch.com/is-down/cloudflare.com) - [Is github.com down right now?](https://lemwatch.com/is-down/github.com) - [Is netlify.com down right now?](https://lemwatch.com/is-down/netlify.com) - [Is openai.com down right now?](https://lemwatch.com/is-down/openai.com) - [Is shopify.com down right now?](https://lemwatch.com/is-down/shopify.com) - [Is stackoverflow.com down right now?](https://lemwatch.com/is-down/stackoverflow.com) - [Is supabase.com down right now?](https://lemwatch.com/is-down/supabase.com) - [Is vercel.com down right now?](https://lemwatch.com/is-down/vercel.com) - [Is wikipedia.org down right now?](https://lemwatch.com/is-down/wikipedia.org) - [Is wordpress.org down right now?](https://lemwatch.com/is-down/wordpress.org) - [Broken Link Checker](https://lemwatch.com/tools/broken-link-checker) - [Bulk website checks](https://lemwatch.com/tools/bulk) - [Bulk Broken Link Checker](https://lemwatch.com/tools/bulk-broken-links) - [Bulk DNS Lookup Tool](https://lemwatch.com/tools/bulk-dns-lookup) - [Bulk Website Malware Checker](https://lemwatch.com/tools/bulk-malware-check) - [Bulk Meta Tag Checker](https://lemwatch.com/tools/bulk-meta-tags) - [Bulk Mixed Content Checker](https://lemwatch.com/tools/bulk-mixed-content) - [Bulk Mobile-Friendly Test](https://lemwatch.com/tools/bulk-mobile-friendly) - [Bulk PageSpeed Checker](https://lemwatch.com/tools/bulk-pagespeed) - [Bulk Security Header Checker](https://lemwatch.com/tools/bulk-security-headers) - [Bulk SSL Certificate Checker](https://lemwatch.com/tools/bulk-ssl-checker) - [Bulk Website Uptime Checker](https://lemwatch.com/tools/bulk-uptime-check) - [canonical tag checker](https://lemwatch.com/tools/canonical-checker) - [website carbon calculator](https://lemwatch.com/tools/carbon-calculator) - [Certificate Transparency Checker](https://lemwatch.com/tools/certificate-transparency-checker) - [Content Freshness Checker](https://lemwatch.com/tools/content-freshness-checker) - [Cookie Compliance Checker](https://lemwatch.com/tools/cookie-compliance) - [core web vitals checker](https://lemwatch.com/tools/core-web-vitals-checker) - [DMARC Record Generator](https://lemwatch.com/tools/dmarc-generator) - [DNS lookup](https://lemwatch.com/tools/dns-lookup) - [domain age checker](https://lemwatch.com/tools/domain-age-checker) - [email deliverability checker](https://lemwatch.com/tools/email-deliverability-checker) - [Exposed Services Checker](https://lemwatch.com/tools/exposed-services-checker) - [favicon checker](https://lemwatch.com/tools/favicon-checker) - [Font Loading Checker](https://lemwatch.com/tools/font-loading-checker) - [Free SEO Audit](https://lemwatch.com/tools/free-seo-audit) - [Hosting Detector](https://lemwatch.com/tools/hosting-detector) - [hreflang checker](https://lemwatch.com/tools/hreflang-checker) - [HTML Validator](https://lemwatch.com/tools/html-validator) - [Image Optimization Checker](https://lemwatch.com/tools/image-optimization-checker) - [noindex checker](https://lemwatch.com/tools/indexability-checker) - [Lazy Loading Checker](https://lemwatch.com/tools/lazy-loading-checker) - [llms txt generator](https://lemwatch.com/tools/llms-txt-generator) - [meta tag analyzer](https://lemwatch.com/tools/meta-tag-analyzer) - [mixed content checker](https://lemwatch.com/tools/mixed-content-checker) - [Mobile-Friendly Test](https://lemwatch.com/tools/mobile-friendly-checker) - [Money Page Finder](https://lemwatch.com/tools/money-page-finder) - [Mozilla Observatory Scan](https://lemwatch.com/tools/mozilla-observatory-checker) - [Open Graph Comparison](https://lemwatch.com/tools/og-image-comparison) - [Print Stylesheet Checker](https://lemwatch.com/tools/print-stylesheet-checker) - [Privacy Policy Checker](https://lemwatch.com/tools/privacy-policy-checker) - [PWA Readiness Checker](https://lemwatch.com/tools/pwa-readiness-checker) - [robots.txt Generator](https://lemwatch.com/tools/robots-txt-generator) - [robots.txt tester](https://lemwatch.com/tools/robots-txt-tester) - [RSS Feed Validator](https://lemwatch.com/tools/rss-feed-validator) - [schema markup validator tool](https://lemwatch.com/tools/schema-markup-checker) - [security header checker](https://lemwatch.com/tools/security-header-checker) - [Sitemap Checker](https://lemwatch.com/tools/sitemap-checker) - [Sitemap Diff](https://lemwatch.com/tools/sitemap-diff) - [SPF DKIM DMARC checker](https://lemwatch.com/tools/spf-dkim-dmarc-checker) - [SPF Record Generator](https://lemwatch.com/tools/spf-generator) - [SSL checker](https://lemwatch.com/tools/ssl-checker) - [Third Party Scripts Checker](https://lemwatch.com/tools/third-party-scripts-checker) - [URL to Markdown Converter](https://lemwatch.com/tools/url-to-markdown) - [Check Site For Malware](https://lemwatch.com/tools/website-malware) - [Website Uptime Checker](https://lemwatch.com/tools/website-uptime) - [WordPress Detector](https://lemwatch.com/tools/wordpress-detector) - [wordpress vulnerability scanner](https://lemwatch.com/tools/wp-vulnerability-scanner) - [What's running on cloudflare.com?](https://lemwatch.com/whats-running/cloudflare.com) - [What's running on github.com?](https://lemwatch.com/whats-running/github.com) - [What's running on netlify.com?](https://lemwatch.com/whats-running/netlify.com) - [What's running on openai.com?](https://lemwatch.com/whats-running/openai.com) - [What's running on shopify.com?](https://lemwatch.com/whats-running/shopify.com) - [What's running on stackoverflow.com?](https://lemwatch.com/whats-running/stackoverflow.com) - [What's running on supabase.com?](https://lemwatch.com/whats-running/supabase.com) - [What's running on vercel.com?](https://lemwatch.com/whats-running/vercel.com) - [What's running on wikipedia.org?](https://lemwatch.com/whats-running/wikipedia.org) - [What's running on wordpress.org?](https://lemwatch.com/whats-running/wordpress.org) ## Related - [Website monitoring overview](https://lemwatch.com/website-monitoring)