Free llms.txt tool
Free llms.txt Checker
Build a spec-correct llms.txt from your site name, summary and links, then check it properly: we fetch any /llms.txt server-side, validate it against the spec, resolve every linked URL to confirm it loads, and score it 0-100 on a published rubric with a copy-paste fix for every issue. Free, no sign-up, and honest about what llms.txt does and doesn't do.
Straight answer
What llms.txt actually does, and what it doesn't.
It is not a ranking or citation signal.Google has stated llms.txt is not used for Search or AI Overviews, and no major AI provider confirms using it. Google's John Mueller: "no AI system currently uses llms.txt." Anyone selling it as a ranking or citation shortcut is guessing.
It is a recognized convention.Google's Chrome Lighthouse (v13.3) added an "Agentic browsing" audit that checks your llms.txt loads without a server error. Some IDE assistants and custom agents read it when pointed at your docs.
So treat it as cheap hygiene, not a growth lever.A clean, curated llms.txt with working links costs little and can't hurt. This checker grades exactly that, technical hygiene, and is built to never overstate the payoff.
From a URL to a scored report in three steps
- 01Give
A domain, or your site details
Check mode fetches /llms.txt at any site's root, server-side. Generator mode takes your site name, a one-line summary, and your key links.
- 02Validate
Spec, links, and robots
We parse the file against the llms.txt spec, resolve every linked URL to confirm it actually loads, and cross-check robots.txt for the own-goal of blocking your own index.
- 03Fix
A score and the exact fixes
Spec validity, a 0-100 quality score on a published rubric, and a copy-paste fix for every issue. Or a clean generated file, ready to upload.
The format, briefly
What goes in an llms.txt file
It's a plain-markdown file at your site root. The spec is small: one H1 with your site name (the only required part), an optional > summary line, then ## Section headers listing curated links as - [Page](https://url): note, pointing to the pages most useful to an LLM. A companion /llms-full.txt can hold the full text. Keep it a lean index, not a sitemap dump.
For the full background, adoption data, real examples, and whether it's worth your time, read our guide: llms.txt: what it is and whether it's actually worth it.
Generator
Generate a spec-correct llms.txt
Name your site, add a summary, and list your key sections and links. It builds a valid file you can copy or download, then check it above. No crawl, no AI, nothing metered.
Don't want to type every link? The llms.txt generator builds one from your domain — it reads your sitemap and pulls real titles and descriptions automatically.
# Your Site Name ## Docs
Save this as llms.txt at your site root (/llms.txt), then check it above.
FAQ
llms.txt, answered honestly
- 01What is an llms.txt file?A plain-markdown file at your site root (yourdomain.com/llms.txt) that gives AI systems a curated index of your most useful pages. The spec is small: one H1 with your site name (required), an optional one-line "> summary", then "## Section" headers listing links as - [Page](url): note. A companion /llms-full.txt can hold full page text. Keep it a lean index, not a sitemap dump.
- 02Does llms.txt help my site get cited by AI?No evidence says so. Google states it isn't used for Search or AI Overviews, and no major AI provider confirms reading it as a signal. Treat it as cheap hygiene for the agents that do read it (some IDE assistants and custom tools), not a visibility lever. Be suspicious of anyone claiming otherwise.
- 03Is the summary blockquote required?No. Only the H1 is required by the spec. We flag a missing blockquote as a suggestion, not an error. Validators that fail you for it are misreading the spec.
- 04How is llms.txt different from robots.txt?Opposite jobs. robots.txt tells crawlers what they may not fetch; llms.txt suggests what's most worth reading. They interact in one important way: robots.txt can accidentally block your llms.txt or the pages it links, which quietly defeats the point. The checker verifies that pairing.
- 05What does the 0-100 quality score measure?Implementation quality, not AI visibility. It is a transparent, published rubric: core validity (30), link health, how many linked URLs actually resolve (30), summary and sections (15), curation and size (15), and companion files and polish (10). Any spec error caps the score at 40. A missing file scores N/A, not zero. We show the full breakdown so the number is never a black box.
- 06Is it free?Yes. The generator and single-URL checks are free with no sign-up. There's no LLM or paid API behind a basic check, so there's nothing to meter.
llms.txt is one optional file. Can AI agents reach the rest of your site?
Agent Readiness scans any URL across 34 AI crawlers, renders the page like a headless agent, and shows what's actually blocking you. Free.