Format validator
llms.txt validator: paste the file and check the three parts of the proposed format, namely the title, the sections and the links to pages, with practical advice for each missing part.
Free validator
Paste your llms.txt file: title, sections and links are checked in your browser, without sending the text.
What it checks
The validator looks for a title line starting with #, sections starting with ## and Markdown links with a full address. Lines enclosed between three backticks are examples and are not counted.
The three parts of the proposed format that the validator looks for in the pasted text, with the sign that identifies them and what it advises you to add when one of them is missing.
| Part of the file | How it recognises it | What to do if it is missing |
|---|---|---|
| Heading | A line starting with # followed by a space and the name. | Open the file with the name of the site or brand. |
| Sections | Lines starting with ## that group similar pages. | Group the pages under headings such as products or support. |
| Links | Text in square brackets followed by a full https address. | List the useful pages with their full address. |
Sample file
Ilmarde Audio’s sample file carries the brand name in the title, one section for products and one for support, and a full link for each page. The validator reads it as a complete structure.
A sample llms.txt for a fictional headphone brand: the title with the name, a section dedicated to products with links to the product pages and a section for support questions.
# Ilmarde Audio## Prodotti- [Brissane](https://ilmarde-audio.example/prodotti/brissane)## AssistenzaFormat limits
llms.txt is a public proposal to offer models a readable index of the site, not an approved standard or a declared ranking factor. A valid file puts the information in order, but it does not decide whether an assistant cites you.
The validator does not download the file from the site: if the published version is different, copy the live one and repeat the check.
It counts well-formed links, but does not check that the linked pages exist or respond.
Frequently asked questions
The answers explain where the file is published, why examples between backticks do not count and what to do when the validator flags missing links in a file that contains some.
At the root of the domain, at the address /llms.txt, as plain text. The validator checks the content you paste; the site audit checks where you publish it.
The validator counts only Markdown links with a full address, starting with http or https. A relative path such as /prodotti/ is not enough for a reader who does not know your domain.
No. The proposed format is a curated index: it lists the most useful pages for understanding who you are and what you offer. For the complete list there is still the sitemap.
Related paths
A valid llms.txt is a starting point. From here you open the other free tools, find out how TrustInsider reads assistant answers over time, consult the published method and ask our support team for help.
Free tools for AI visibility: check how Gemini describes the brand, the AI crawlers in robots.txt, your llms.txt and your share of voice.
ReadLearn how to use TrustInsider: choose the brand and the questions, read the collected answers, update your content and compare the results.
ReadHow every TrustInsider measure is built: sampling of AI answers, sources and rights, index calculation and declared limits.
ReadHelp with access, credits, collections, integrations and data: guides, FAQs, the site assistant and support requests from your workspace.
Read