29 Best Free SEO Tools in 2026 (No Signup Required)
You don't need to pay $99+/month for SEO tools. Here are 29 free tools you can use right now to scan, analyze, and optimize your website — for both traditional search engines and AI search. Every tool works instantly, no account needed.
Why Free SEO Tools Matter
Premium SEO tools like Ahrefs ($99/mo), Semrush ($139/mo), and Moz ($49/mo) are powerful but expensive — especially for freelancers, startups, and small businesses. Many SEO tasks can be handled with free tools that give you 80% of the insight at 0% of the cost.
The tools below cover website scanning, content optimization, technical SEO, security, accessibility, and — uniquely — GEO (Generative Engine Optimization) for AI search engines like ChatGPT, Perplexity, and Google AI Overviews.
The Complete List
Website Scanner
Full SEO + GEO + performance + security + accessibility scan
Open Graph Debugger
Preview how URLs look on Facebook, Twitter, LinkedIn, Discord
Word Counter
Word count, readability score, reading time, keyword analysis
Favicon Checker
Check all favicon files and formats
Content GEO Optimizer
Check content for AI citation readiness
Schema Generator
Generate JSON-LD markup for 9 schema types
Robots.txt Generator
Create AI-optimized robots.txt files
Meta Tag Analyzer
Analyze title, description, OG, and Twitter Card tags
Heading Analyzer
Check H1-H6 hierarchy for SEO issues
Broken Link Checker
Find 404s, redirects, and dead links
Keyword Density Checker
Analyze keyword frequency and density
Site Comparison
Compare two websites side by side
SSL/TLS Checker
Check certificate validity, TLS version, and security grade
Page Speed Checker
Core Web Vitals and performance opportunities
HTTP Headers Checker
Inspect security headers and server info
Redirect Checker
Trace redirect chains, loops, and issues
WHOIS Lookup
Domain registration details and age
DNS Record Checker
Look up A, AAAA, CNAME, MX, TXT records
Technology Checker
Detect CMS, frameworks, analytics, CDN
Uptime Checker
Check if a website is up or down
Accessibility Checker
15 WCAG compliance checks
Contrast Checker
WCAG 2.1 color contrast requirements
Carbon Calculator
Estimate website carbon footprint per visit
Robots.txt Tester
Analyze robots.txt and check AI bot access
Password Checker
Password strength, entropy, and crack time
Sitemap Validator
Validate sitemap.xml structure and URLs
Structured Data Tester
Validate JSON-LD schema markup
GEO Score Badge
Embed AI search readiness badge on your site
Public REST API
Free API for automated scanning
What Makes These Different
Most "free SEO tool" lists point you to 29 different websites. These are all in one place, maintained by one team, and designed to work together:
- No signup required — every tool works instantly, no email or credit card
- GEO analysis included — the only free tools that check AI search readiness
- Free REST API — automate scanning in your CI/CD pipeline
- MCP server — use these tools from Claude Code, Cursor, or other AI editors
- Cross-linked insights — scan results link to relevant tools and guides
When You Need Paid Tools
Free tools have limits. You'll need paid tools for:
- Keyword research — search volume, difficulty, SERP analysis (Ahrefs, Semrush)
- Backlink analysis — link profile, competitors' links, toxic links (Ahrefs, Moz)
- Rank tracking — daily keyword position monitoring (Semrush, Ahrefs)
- Full site crawls — crawl 10K+ pages for technical issues (Screaming Frog, Sitebulb)
For everything else — quick audits, content optimization, security checks, GEO analysis, meta tag debugging — these free tools have you covered.
Start with a full website scan
Enter any URL and get instant scores across SEO, GEO, performance, security, and accessibility.
Scan Your Website Free