Check your llms.txt file against the official spec. Validates 12 rules including H1 structure, summary blockquote, sections, link format, and absolute URLs. Get a score, fixes, and an embeddable verification badge.
Auto-checks /llms.txt and /llms-full.txt. Cached 24h. No signup.
llms.txt is an emerging open standard for helping LLMs understand your website. It is a single Markdown file at the root of your domain that lists your most important pages in a curated, AI-friendly format.
Think of it as the AI-era equivalent of sitemap.xml, but designed for ChatGPT, Perplexity, and Claude instead of Googlebot. Major companies including Anthropic, Stripe, and Mintlify already publish llms.txt files.
The validator runs 12 spec rules against your file and outputs a score, line-by-line issues, and an embeddable verification badge.
# GrandRanker > AI-powered SEO platform that automates keyword research, content creation, optimization, and publishing to grow organic traffic on auto-pilot. ## Docs - [Homepage](https://grandranker.com): GrandRanker overview and features - [Pricing](https://grandranker.com/pricing): Plans starting from $49/month - [Platform](https://grandranker.com/platform): CMS integrations and capabilities ## Free Tools - [SEO Audit](https://grandranker.com/free-tools/seo-audit): Free comprehensive SEO audit - [GEO Score Checker](https://grandranker.com/free-tools/geo-score-checker): AI search readiness score - [Schema Generator](https://grandranker.com/free-tools/schema-markup-generator): JSON-LD schema markup ## Optional - [Affiliate Program](https://grandranker.com/affiliate-program): 30% recurring commission - [Press Kit](https://grandranker.com/press): Logos, screenshots, founder bio
Optimize every layer of AI search visibility.
Does your keyword trigger a Google AI Overview? See the answer and cited sources.
Run real prompts through ChatGPT and benchmark brand visibility vs competitors.
Every PAA question Google shows for a keyword, with answers and source URLs.
Score any URL 0-100 for AI search readiness with embeddable badge.
Build a spec-compliant llms.txt by crawling your homepage and sitemap.
Generate JSON-LD bundles optimized for ChatGPT and Perplexity citation.
Paragraph-level AI citability heat-map with rewrite recommendations.
Run real queries through ChatGPT, Perplexity, and Gemini and check citations.
Everything to know about llms.txt and validation.
llms.txt is an emerging open standard (proposed by Jeremy Howard) that helps AI engines like ChatGPT, Perplexity, and Claude understand your website structure. It is a Markdown file at /llms.txt that lists key URLs in a curated format optimized for LLM consumption.
No. robots.txt tells crawlers what they can and cannot access. sitemap.xml is an XML list of all URLs for traditional search engines. llms.txt is a curated, human-readable Markdown summary of the most important content for AI systems. The three complement each other.
The validator runs 12 checks against the llms.txt spec: H1 header presence and content, summary blockquote, H2 sections, link format, absolute URLs, Optional section, file size, encoding, empty headings, and more. It returns a 0-100 score plus per-check pass/warn/fail details.
Place it at the root of your domain: yoursite.com/llms.txt. For longer documentation, you can also publish yoursite.com/llms-full.txt. The validator checks both locations automatically.
Adoption is growing. Anthropic, OpenAI, and Perplexity have all published support. Major sites including Anthropic, Stripe, Mintlify, and Vercel publish llms.txt files. Even if not every engine reads it today, getting ahead of the curve costs nothing.
A llms.txt generator is on the GrandRanker roadmap. For now, you can write one manually following the spec at llmstxt.org. The example below shows the structure.