The Ultimate Free SEO Audit
An SEO audit helps you identify issues hurting your search rankings. Here's a comprehensive checklist with a free tool for every check.
1. Meta Tags & On-Page SEO
| Check | Free Tool |
|---|---|
| Title tag length & quality | Title & Description Checker |
| Meta description optimization | SEO Analyzer |
| Open Graph / Twitter Cards | SEO Analyzer |
| SERP appearance preview | SEO Analyzer |
| Heading structure (H1-H6) | SEO Analyzer |
2. Technical SEO
| Check | Free Tool |
|---|---|
| SSL certificate validity | SSL Certificate Checker |
| Robots.txt configuration | SEO Analyzer |
| Sitemap validation | Sitemap Extractor |
| Canonical tag conflicts | SEO Analyzer |
| Hreflang tags (international) | Keyword Density Analyzer |
| Redirect chains | SEO Analyzer |
3. Content Quality
| Check | Free Tool |
|---|---|
| Keyword density | Keyword Density Analyzer |
| Readability scores | Keyword Density Analyzer |
| Word count | Keyword Density Analyzer |
| Broken images | Broken Link Checker |
| Broken links | Broken Link Checker |
| Spelling errors | Krawly's free tools |
4. Performance
| Check | Free Tool |
|---|---|
| Page speed metrics | Technology Detector |
| Core Web Vitals estimate | Technology Detector |
| Resource analysis | Technology Detector |
| Mobile friendliness | SEO Analyzer |
5. Security
| Check | Free Tool |
|---|---|
| Security headers grade | SSL Certificate Checker |
| Mixed content issues | SSL Certificate Checker |
| Cookie compliance | SSL Certificate Checker |
| DMARC / SPF / DKIM | Email Validator |
6. Structured Data
| Check | Free Tool |
|---|---|
| JSON-LD validation | JSON-LD Extractor |
| Schema extraction | JSON-LD Extractor |
7. Competitive Analysis
| Check | Free Tool |
|---|---|
| Technology stack | Technology Detector |
| CMS & version | Technology Detector |
| Competitor comparison | Website Comparison |
8. Accessibility
Accessibility sits in an SEO checklist for two reasons. The first is mechanical: the things that make a page usable with a screen reader — real heading hierarchy, alternative text, descriptive link text, semantic landmarks — are the same signals a crawler uses to understand the page. The second is legal. The European Accessibility Act has applied to consumer-facing digital services since June 2025, and ADA web accessibility suits in the US have run past 4,000 filings a year.
| Check | Free Tool |
|---|---|
| Heading hierarchy & landmarks | SEO Analyzer |
| Missing image alt text | Accessibility Checker |
| Colour contrast (4.5:1 body text) | Contrast Checker |
| Unlabelled form fields | Accessibility Checker |
| Keyboard operability | Manual — tab through the page yourself |
| WCAG 2.1 AA conformance score | Accessibility Checker |
Automated testing covers roughly 30–40% of the WCAG success criteria — contrast, alt attributes, form labels, ARIA validity. The rest needs a person: whether alt text is actually meaningful, whether focus order follows the visual layout, whether an error message helps. Any tool claiming full coverage is overselling.
How to Run a Full Audit
Start with the SEO Analyzer for a comprehensive overview, then drill into specific areas using the tools above.
All 55+ tools are free with no signup required on Krawly.io.