Audit.Optimize.Rank Higher.
Professional-grade technical SEO diagnostics, DNS & SSL inspectors, Core Web Vitals speed analyzers, and schema generators—100% free with zero signup walls.
Deep SEO Checks
50+ PointsReal-time HTML, meta tags, headings, links, and schema inspection.
Privacy-First
Zero TrackingNo account required. Your audited URLs and code never get sold.
Instant Telemetry
<50ms EngineDirect DNS, HTTP header, and SSL handshakes executed on the fly.
Complete Suite
Free Forever70+ specialized SEO, domain, performance, and developer tools.
Every Layer of Modern SEO Engineering
Search rankings depend on five interconnected technical pillars. FlexaSEO gives you specialized diagnostic utilities for every single layer.
Site Crawl & Architecture
Inspect HTTP status codes, redirect chains, robots.txt directives, and XML sitemaps to ensure 100% search indexability.
Meta, Headings & Content
Optimize title tags, meta descriptions, H1–H6 hierarchy, keyword density, and OpenGraph social cards for maximum CTR.
Core Web Vitals & Speed
Diagnose Largest Contentful Paint (LCP), Cumulative Layout Shift (CLS), TTFB, and asset compression bottlenecks.
DNS, WHOIS & SSL Trust
Verify A, MX, TXT, and NS records, inspect TLS/SSL certificate chains, and check domain age and server headers.
Schema & Structured Data
Generate error-free JSON-LD markup for FAQs, Articles, Products, and Local Businesses to win rich SERP snippets.
Flagship Tools for Search Dominance
Switch categories below to launch our most popular diagnostics across technical SEO, DNS & SSL verification, content optimization, and developer utilities.
Website SEO Analyzer
Comprehensive on-page & technical SEO audit with meta, headings, images, and score report.
Page Speed & Web Vitals
Measure loading speed, Largest Contentful Paint (LCP), CLS, and performance bottlenecks.
DNS Record Checker
Inspect A, AAAA, MX, TXT, CNAME, and NS records with live global resolution timing.
Google SERP Simulator
Preview desktop and mobile Google search snippets with live pixel-width meters.
Broken Link Checker
Scan web pages for dead 404 links, broken outbound anchors, and invalid redirects.
Schema Markup Generator
Create validated JSON-LD structured data for FAQ, Article, Product, LocalBusiness & more.
WHOIS Domain Lookup
Query domain registrar data, creation & expiry dates, nameservers, and RDAP status.
XML Sitemap Generator
Generate clean, standard-compliant XML sitemaps to accelerate Googlebot indexing.
Need a Complete 50+ Point Website SEO Audit?
Flagship AnalyzerInspect on-page meta tags, heading structure, broken links, HTTP headers, image alt attributes, and page performance in one instant report.
Explore by SEO Discipline
Every category combines specialized browser-based utilities with actionable step-by-step technical documentation.
SEO Analysis & SERP
Audit title tags, meta descriptions, heading hierarchy, keyword density, and live Google SERP snippet previews.
Technical SEO & Speed
Test LCP/CLS performance, validate robots.txt and XML sitemaps, generate JSON-LD schema, and inspect redirects.
Domain, DNS & SSL
Lookup A, MX, TXT, and NS records, verify SSL/TLS certificate chains, check WHOIS history, and inspect HTTP headers.
Content & Copywriting
Analyze reading grade levels, word & character counts, keyword prominence, text diffs, and clean HTML formatting.
YouTube & Video SEO
Extract high-performing video tags, generate optimized titles and descriptions, and download HD video thumbnails.
Developer & ROI Calculators
Minify HTML/CSS/JS, format JSON, generate Dockerfiles, and calculate SEO ROI, CPC, CPM, and conversion growth.
Latest from the SEO Knowledge Hub
From URL to Action Plan in Seconds
No credit cards, no account walls, and no bloated dashboards—just instant engineering telemetry for your website.
Select a Diagnostic Tool
Choose from 70+ specialized utilities across technical SEO, DNS & SSL, Core Web Vitals, and content optimization.
Enter URL, Domain, or Code
Paste your target URL or raw snippet. Our real-time engine inspects live HTTP headers, DNS records, and DOM structure.
Apply Actionable Fixes
Review prioritized pass/fail diagnostics, copy generated JSON-LD or meta tags, and resolve technical bottlenecks.
Verify & Scale Rankings
Re-test your pages anytime to confirm 100/100 technical health and sustained organic search visibility.
Ready to Boost Your Search Rankings?
Run a complete technical SEO audit, test Core Web Vitals, or explore all 70+ webmaster utilities right now—completely free with zero registration.