Does this validator fetch my llms.txt file from a URL?
No. This tool is paste-only and never requests a URL. Your text is checked in the browser so you can validate drafts before they are public.
Free AI SEO tool
Validate your llms.txt structure before you publish.
Paste the contents of your llms.txt file below. This browser-only validator checks the proposed Markdown structure without fetching a URL.
How to use this tool
- Paste your llms.txt content into the Paste your llms.txt field.
- Click Load example if you want to see a valid starting format.
- Click Validate to check the H1, summary, sections, and markdown links.
- Review each error or warning in the Validation results panel.
- Update your file and validate again before publishing it at /llms.txt.
Questions
Frequently asked questions
Useful context for applying this tool to your site.
What does a valid llms.txt file need?
The proposed format requires one H1 identifying the site or project. A short blockquote summary and H2 sections containing Markdown links are strongly recommended for a useful file.
Is a warning the same as an invalid file?
No. Warnings identify useful improvements such as adding a summary or links below a section. Errors identify problems that make the expected structure unclear, such as a missing H1 or malformed link syntax.
How large should llms.txt be?
Keep it concise and focused on the highest-value pages. This validator warns when the file exceeds 50KB because a shorter guide is easier for a reader or tool to process.