Free Website Tools
Check your site's security, performance, SEO, and DNS configuration. Instant results, no signup required.
Need to audit a list of sites?
Try our bulk checkers — run up to 25 URLs in one paste with CSV export.
SSL Checker
Check if your SSL/TLS certificate is valid, properly configured, and when it expires. Get instant results for any URL.
Use toolSecurity Headers
Scan your website's HTTP security headers and get a grade from A+ to F. Find missing headers and get configuration examples.
Use toolDNS Lookup
View all DNS records for any domain — A, AAAA, CNAME, MX, TXT, NS records. Verify DNS configuration instantly.
Use toolMeta Tags
Extract and validate meta tags from any URL — title, description, Open Graph, Twitter Cards, and more.
Use toolCarbon Calculator
Estimate the CO₂ emissions of any web page. See how your site compares to others and get tips to reduce your carbon footprint.
Use toolMixed Content
Find HTTP resources loaded on HTTPS pages. Mixed content breaks the padlock icon and creates security warnings.
Use toolEmail Auth
Validate your domain's email authentication records. Check SPF, DKIM, and DMARC configuration to improve email deliverability.
Use toolCore Web Vitals
Test LCP, INP, and CLS for any URL. Get the same Lighthouse-grade scores Google uses to rank your pages.
Use toolMobile-Friendly
Check if Google sees your page as mobile-friendly. Find viewport, tap target, and font-size issues that hurt mobile rankings.
Use toolObservatory Scan
Get a full A+ to F security grade for any site. Tests headers, cookies, mixed content, and Subresource Integrity.
Use toolPWA Readiness
Check if your site qualifies as an installable Progressive Web App. Tests manifest, service worker, icons, and offline support.
Use toolImage Optimization
Find oversized, uncompressed, or wrong-format images on any page. Get exact byte savings for WebP/AVIF conversion.
Use toolLazy Loading
Find images and iframes that should be lazy-loaded. See how many requests you can defer below the fold.
Use toolFont Loading
Audit how your web fonts load. Find FOIT, missing `font-display: swap`, and oversized font files dragging down LCP and CLS.
Use toolThird-Party Scripts
Find every third-party script on your page. Measure bytes, blocking time, and which ones are killing INP.
Use toolBroken Links
Crawl your site and find every 404, 5xx, redirect chain, and dead external link. See exact URLs, source pages, and HTTP status codes.
Use toolExposed Services
See which ports and services your domain exposes to the public internet. Spot critical risks like open SSH, MySQL, Redis, or RDP before attackers do.
Use toolIndexability
Check whether Google can actually index your page. Detects noindex, canonical conflicts, X-Robots-Tag headers, soft 404s, and crawl blockers.
Use toolContent Freshness
Find which pages on your site haven't been updated in months. See last-modified dates, age in days, and which pages need a refresh to keep ranking.
Use toolSitemap Checker
Validate your XML sitemap. Find it, parse it, count URLs, detect sitemap indexes, and flag suspicious or broken sub-sitemaps.
Use toolCert Transparency
See every TLS certificate ever issued for your domain. Discover hidden subdomains, spot rogue certificates, and audit your CAs.
Use toolURL → Markdown
Convert any web page to clean, LLM-ready Markdown. Strip ads, scripts, and chrome. Perfect for feeding pages to ChatGPT, Claude, or training data.
Use toolHTML Validator
Validate any URL against the W3C HTML5 spec. Find every parser error, stray tag, duplicate ID, and accessibility-blocking issue in seconds.
Use toolRSS Validator
Find every RSS and Atom feed on a page, verify the XML is valid, and count items. Critical for blogs, podcasts, newsletters, and AI-search syndication.
Use toolOG Comparison
Compare Open Graph and Twitter Card metadata between any two URLs. See og:image previews, sizes, titles, descriptions, and canonical mismatches side-by-side.
Use toolSitemap Diff
Compare two XML sitemaps. See exactly which URLs were added, removed, or are common to both. Perfect for monitoring deploys, migrations, and competitor changes.
Use toolWordPress Detector
Detect if a site runs WordPress. Identify the WordPress version, active theme, and visible plugins from the public HTML — no login required.
Use toolHosting Detector
Find out which hosting provider, CDN, and web server power any website. Identifies AWS, Cloudflare, Vercel, Netlify, Shopify, WP Engine, and 50+ other providers.
Use toolUptime Checker
Check if any website is up right now. Get HTTP status code, response time, full redirect chain, server header, and content size in seconds.
Use toolMalware Checker
Check any site for malware, phishing and unwanted software using the Google Safe Browsing list. Instant result, no signup.
Use toolCookie Compliance
Detect whether a site has a cookie consent banner, identify the consent tool used, and check if tracking scripts load before consent (GDPR violation).
Use toolPrivacy Policy Check
Verify that a site has a Privacy Policy, Terms of Service, Cookie Policy, and Imprint. Detects missing legal pages — a hard requirement under GDPR, CCPA, and most jurisdictions.
Use toolPrint Stylesheet
Check if a page has print-specific CSS. Missing print styles mean broken layouts, wasted ink, and unprofessional output when users print or save as PDF.
Use toolMoney Page Finder
Auto-detect the most revenue-critical pages on any website. Surfaces pricing, signup, checkout, demo, and contact pages from the sitemap — the ones that must never go down.
Use toolFree SEO Audit
Run a complete free SEO audit in under 60 seconds. Covers Core Web Vitals, on-page SEO, security, indexability, broken links, and mobile-friendliness — with deep-dive links to fix every issue.
Use toolllms.txt Generator
Generate a spec-compliant llms.txt file in 30 seconds. Help ChatGPT, Claude, Perplexity, and other AI systems understand your site so they cite it correctly.
Use toolBulk SSL Checker
Check SSL certificates on up to 25 domains at once. Validity, expiry, issuer, TLS version and grade — exportable to CSV.
Use toolBulk Headers
Scan HTTP security headers across up to 25 URLs in one batch. HSTS, CSP, X-Frame-Options, Permissions-Policy — graded A+ to F.
Use toolBulk DNS Lookup
Resolve DNS records for up to 25 domains at once. A, AAAA, MX, NS, TXT, CNAME — exported as CSV for diff and audit.
Use toolBulk Meta Tags
Audit titles, meta descriptions, Open Graph and Twitter cards across up to 25 URLs in one paste. Spot duplicates and missing tags fast.
Use toolBulk Mobile Test
Check mobile-friendliness across up to 25 URLs at once. Viewport, tap targets, text size, content fit — pass/fail per URL.
Use toolBulk PageSpeed
Run PageSpeed (Lighthouse) on up to 25 URLs in one go. Performance score, LCP, CLS, and TBT per URL — exportable.
Use toolBulk Uptime
Check whether up to 25 sites are currently online. Status code, response time, and a per-URL up/down verdict.
Use toolBulk Mixed Content
Find HTTP resources loaded on HTTPS pages across up to 25 URLs. One paste to catch insecure images, scripts, and iframes at scale.
Use toolBulk Broken Links
Scan up to 25 pages for broken outbound links in one batch. Per-page count of 404s, 500s, and unreachable URLs.
Use toolBulk Malware
Cross-check up to 25 URLs against malware and phishing blocklists in one paste. Flag any site flagged by major safe-browsing sources.
Use toolFavicon Checker
Check whether your site exposes a valid favicon at /favicon.ico and via <link rel="icon"> — and that browsers, search engines, and bookmark tools can actually fetch it.
Use toolSchema Checker
Validate JSON-LD, Microdata, and RDFa structured data on any URL. See exactly which schema types are declared and whether they parse correctly for Google rich results.
Use toolWP Vulnerability Scanner
Detect whether a site runs WordPress, identify the core version, and surface known CVEs against that release. Non-invasive — only reads what the site publicly exposes.
Use toolrobots.txt Generator
Build a spec-compliant robots.txt in 30 seconds. Block crawlers, allow specific paths, point search engines to your sitemap, and decide which AI crawlers can train on your site.
Use toolSPF Generator
Build a valid SPF TXT record by ticking the email providers you use. Counts DNS lookups so you stay within the RFC 7208 limit of 10.
Use toolDMARC Generator
Build a valid DMARC TXT record in under a minute. Choose your policy, set reporting addresses, and get a copy-paste record to publish at _dmarc.
Use toolEmail Deliverability
One-click audit of MX, SPF, DMARC, MTA-STS, and BIMI for any domain. Identifies the exact reason your mail is hitting spam — and what to fix first.
Use toolrobots.txt Tester
Fetch any site's robots.txt and audit it against the spec. Catches Disallow: /, missing sitemaps, broken syntax, oversized files, and unknown directives in one pass.
Use toolHreflang Checker
Scan any URL for hreflang tags and validate them against the spec. Catches missing self-references, missing x-default, invalid language codes, duplicate targets, and protocol mismatches.
Use toolCanonical Checker
Check the canonical URL of any page. Finds missing, conflicting, relative, and cross-domain canonical tags — the quiet reason good pages drop out of the index.
Use toolDomain Age
Look up when a domain was first registered, when it expires, and who it is registered with — straight from live RDAP registry data.
Use toolHTTP Status Code Reference
Learn about every HTTP response code — what they mean, common causes, and how to fix them:
Free Tools FAQ
Common questions about our free website tools