Free SEO tools, built to actually use

llms.txt Generator

Build a valid llms.txt file for your site in minutes, with a summary and sections of key links, then copy or download it.

llms.txt Checker

Confirm your llms.txt loads, is served as text, and follows the format with an H1, summary and sections of links.

AI Crawler Checker

See whether robots.txt allows GPTBot, ClaudeBot, OAI-SearchBot, PerplexityBot and other AI bots, and what blocking each one means.

Invisible Character Detector

Reveal hidden Unicode, zero-width and bidirectional characters in text, prompts and AI rules files, and decode hidden instructions.

Meta Tag Generator

Build title, description, canonical, and Open Graph/Twitter tags with live length guidance.

Robots.txt Generator

Build a robots.txt with per-crawler rules, including AI bots like GPTBot and ClaudeBot.

Schema Markup Generator

Build valid JSON-LD for Article, Product, FAQ, Recipe, and 9 other schema.org types.

SERP Snippet Preview

Preview your title and description as a real Google result, with pixel-accurate truncation.

Broken Link Checker

Crawl a page's links and find the ones that are dead before your users do.

Security Headers Checker

CSP, HSTS, and every other HTTP security header - analyzed, not just listed.

Open Graph Checker

See whether your page has the og:title, og:description, and og:image tags social platforms need.

Schema Markup Checker

Check whether your page ships JSON-LD structured data search engines and AI agents can read.

Sitemap Checker

Check whether your sitemap.xml is reachable, valid, and free of common mistakes.

Redirect Checker

Trace a URL's redirect chain and catch loops, excess hops, and HTTPS-to-HTTP downgrades.

SSL Checker

Test your SSL certificate for expiry, hostname match, chain trust, TLS version, key strength and HSTS in seconds.

Color Contrast Checker

Calculate the WCAG contrast ratio of any two colors and see AA and AAA results, with a suggested accessible color.

Website Technology Checker

Find out which CMS, framework, ecommerce platform and libraries a website is built with.

robots.txt Checker

Check syntax, sitemap lines and size limits, and test whether Googlebot or any crawler can access a URL.

Canonical Checker

Find missing, duplicate, relative or conflicting canonical tags and check that the canonical URL loads.

Hreflang Checker

Validate language codes, x-default and self-references, and confirm every alternate page links back.

Meta Tag Checker

Check title tags, meta descriptions, H1 headings, robots, viewport and Open Graph tags on any page.

HTTP Status Checker

Check up to 20 URLs at once for 200, 301, 404 and 500 responses and redirect chains.

CSP Evaluator

Check a Content-Security-Policy for unsafe-inline, unsafe-eval, wildcards, missing object-src and base-uri, from a URL or pasted policy.

Mixed Content Checker

Find http:// scripts, stylesheets, iframes and images on HTTPS pages that browsers block or warn about.

Alt Text Checker

Find images with missing, empty, file-name or overly long alt text on any page, for accessibility and image SEO.

API Key Leak Checker

Scan a website's public HTML and JavaScript for exposed API keys, tokens and secrets.