llms-txt.io generates and validates llms.txt files and keeps them current via managed sites. Free generator; paid plans from $15/month.
Researched and fact-checked by Bartu Cavusoglu · Updated October 26, 2026
llms-txt.io is a web tool for creating, validating and publishing llms.txt files. The llms.txt format is a markdown standard proposed by Jeremy Howard of Answer.AI. It gives AI coding assistants and agents a clean, machine-readable map of a documentation site.
The service is built around making docs agent-ready for tools such as Cursor, Claude Code and Copilot. It produces both llms.txt, which provides navigation structure, and llms-full.txt, which contains the complete documentation content.
The company behind the site is Lemon Tree Ventures, LLC. The homepage states that more than 50,000 llms.txt files have been generated with the tool.
The workflow has three steps. First, you paste your URL and the service crawls the site, then builds spec-compliant llms.txt and llms-full.txt files with AI-written summaries and link descriptions. This step is free.
Second, you connect the file to your domain. You add one rewrite rule so your own /llms.txt points to a stable URL, or you receive the file through a webhook and commit it to your repository.
Third, the file stays current. The service re-checks the site on your schedule and regenerates only when the content has changed. It fingerprints the site first, so a refresh with no changes does not alter the file or trigger the webhook.
The free tools are a generator and a validator. The generator turns any site into spec-compliant files. The validator lints any llms.txt, by URL or pasted content, and returns a score for structure and agent-readiness.
Managed sites add scheduled regeneration, weekly or daily, along with a stable URL and webhook delivery. An instructions-for-agents block can be embedded so assistants describe and use a product the way its owner intends.
The API covers generation and validation from CI or a custom product, using API keys, monthly quotas and unattended access. On Business, files can be embedded or white-labeled, and one account can manage up to 250 sites.
llms-txt.io is a tool that generates and validates llms.txt and llms-full.txt files. Paid plans add an API and managed sites that keep the files current automatically.
The web generator is free forever. Paid plans are Starter at $15 per month and Pro at $49 per month, with a custom-priced Business plan. Prices are in USD and billed monthly.
Yes. The Free plan includes unlimited web generation, llms-full.txt up to 20 pages, 25 API generations and 2,000 API validations per month. No credit card is needed to start.
A managed site is a registered domain whose llms.txt files are regenerated on a weekly or daily schedule, only when content changes. Files are served from a stable URL and can be sent to a webhook.
llms.txt provides navigation structure, while llms-full.txt contains the complete documentation content. For simple sites llms.txt alone is usually enough, while documentation sites can benefit from both.
According to the site, the 2026 evidence shows no measurable effect on AI search rankings. Its stated value is feeding clean documentation to AI coding assistants and agents.
API requests return a 429 until the next month or an upgrade. A managed site that reaches its refresh limit keeps serving its last generated file.
Yes. You can upgrade, downgrade or cancel from the billing portal. Cancellations take effect at the end of the current billing period.