# Free SEO & AI-Readiness Tools — Check It, Fix It, Ship It

> Agent-friendly Markdown of https://www.buildseo.org/free-tools — full index for AI agents: https://www.buildseo.org/llms.txt

Free, instant tools for SEO and AI-agent readiness. No login, no email, no gate — enter a URL and get the answer, downloadable on the spot.

## AI-agent readiness
- [AFDocs Checker](https://www.buildseo.org/free-tools/afdocs-checker.md): Score any docs site against the Agent-Friendly Documentation spec — 23 checks, one grade.
- [llms.txt Validator](https://www.buildseo.org/free-tools/llms-txt-validator.md): Validate a site's llms.txt against the llmstxt.org structure.
- [AI Search Readiness Checker](https://www.buildseo.org/free-tools/ai-search-readiness-checker.md): See how ready a page is to be cited by AI search engines.

## On-page / technical
- [Meta Tag Analyzer](https://www.buildseo.org/free-tools/meta-tag-analyzer.md): Audit a page's title, description, canonical, and robots tags in one pass.
- [Open Graph Checker](https://www.buildseo.org/free-tools/open-graph-checker.md): Verify og: and twitter: tags so links unfurl with the right title and image.
- [Robots.txt Tester](https://www.buildseo.org/free-tools/robots-txt-tester.md): Parse any site's robots.txt: groups, rules, sitemap directives, and blockers.
- [Heading Structure Extractor](https://www.buildseo.org/free-tools/heading-structure-extractor.md): Extract a page's h1-h6 outline and catch skipped levels and duplicate H1s.
- [Sitemap Validator](https://www.buildseo.org/free-tools/sitemap-validator.md): Validate an XML sitemap's structure, URLs, and freshness fields.
- [Alt-Text Checker](https://www.buildseo.org/free-tools/alt-text-checker.md): Find images missing alt text on any page.
- [Schema Validator](https://www.buildseo.org/free-tools/schema-validator.md): Extract and validate a page's JSON-LD structured data.
- [Redirect & SSL Checker](https://www.buildseo.org/free-tools/redirect-ssl-checker.md): Trace a URL's redirect chain and confirm its SSL setup.
- [Broken Link Checker](https://www.buildseo.org/free-tools/broken-link-checker.md): Find dead links on a page before your visitors do.
- [Console Error Scanner](https://www.buildseo.org/free-tools/console-error-scanner.md): Load a page in a real browser and capture its console errors.

## Authority
- [Domain Authority Checker](https://www.buildseo.org/free-tools/domain-authority-checker.md): Check any domain's Open PageRank authority score.

## Generators
- [Meta Tag Generator](https://www.buildseo.org/free-tools/meta-tag-generator.md): Write title, description, OG, and Twitter tags with live length checks.
- [Robots.txt Generator](https://www.buildseo.org/free-tools/robots-txt-generator.md): Compose a clean robots.txt from user-agent rules and a sitemap URL.
- [UTM Builder](https://www.buildseo.org/free-tools/utm-builder.md): Assemble campaign URLs with source, medium, and campaign parameters.
- [JSON-LD Generator](https://www.buildseo.org/free-tools/json-ld-generator.md): Generate Organization, Article, or FAQ structured data ready to paste.