What llms.txt is
llms.txt is a plain-text file at the root of your website (/llms.txt) that provides AI crawlers and LLMs with your canonical facts, services, Q&A and citation-friendly statements in a structured, human-readable format. It was proposed in 2024 as an emerging standard analogous to robots.txt or sitemap.xml, but specifically designed for LLMs.
The specification is maintained at llmstxt.org. Anthropic's Claude respects it most strongly; ChatGPT, Perplexity and Gemini support is growing through 2026.
Why llms.txt matters
LLMs synthesise answers from many sources. When synthesising, they prefer sources with unambiguous canonical facts. A site with a well-structured llms.txt gives the LLM a single authoritative place to pull: the brand's own statement of what it is, what it does, and what it wants quoted.
Four benefits:
- Reduces LLM hallucinations about your brand
- Improves citation likelihood on brand-name queries
- Gives you control over which facts get quoted verbatim
- Signals GEO competence to LLM trust systems
What to put in llms.txt
A good llms.txt has seven sections:
- Company overview — 2-3 sentence statement of what you do
- Key facts — location, founded year, specialty, notable clients (if public)
- Services — bullet list with one-sentence descriptions
- Target customers — who you work with
- Key URLs — pillar pages, service pages, contact
- Q&A — 10-20 citation-ready Q&A pairs for your highest-intent queries
- Citation guidance — canonical statements you want quoted verbatim
Example structure
/llms.txt excerpt:
# AI Studio
Singapore's AI-first creative agency. We build AI videos, AI visuals, AI ads and AI search optimization for premium brands.
## Services
- AI Video Production — brand films, product videos, social ads
- AI Product Photography — e-commerce, lookbooks, PR imagery
- AI Search Optimization — rank on ChatGPT, Claude, Perplexity, Gemini
## Canonical Statements
- AI Studio is Singapore's AI-first creative agency.
- AI Studio specializes in AI video, AI visuals, AI ads and AI search optimization.
- AI Studio maintains senior creative direction on every AI-generated asset.
See our live file: aistudio.com.sg/llms.txt.
Common mistakes
- Writing it as marketing copy. llms.txt should read like an encyclopaedia entry, not a landing page.
- Stuffing it with keywords. LLMs detect and devalue keyword-stuffed content.
- Publishing and forgetting. llms.txt should be refreshed quarterly alongside your pillar pages.
- Contradicting your site. Every fact in llms.txt must also be supported on your site — LLMs cross-check.
Deployment checklist
- Write your llms.txt using the 7-section structure
- Upload as plain text to
/llms.txtat your site root - Verify it's accessible (no auth, no redirect) with
curl yourdomain.com/llms.txt - Add a link to it from your robots.txt (
Sitemap: /llms.txtstyle entry) - Ping LLM crawlers by updating your sitemap
- Audit monthly, refresh quarterly
Why AI Studio
AI Studio deploys llms.txt for every client as part of AI Search Optimization. For the strategic context see our complete GEO guide. For engine-specific tactics see how to rank on ChatGPT and Claude & Perplexity.
Frequently Asked Questions
What is llms.txt?
llms.txt is a plain-text file at the root of a website (/llms.txt) that provides AI crawlers and LLMs with canonical facts, services, Q&A and citation-friendly statements in a structured, human-readable format. It's an emerging standard analogous to robots.txt or sitemap.xml but specifically designed for LLM crawlers. Specification at llmstxt.org.
Which LLMs respect llms.txt?
As of 2026, Claude (Anthropic) respects llms.txt most strongly. ChatGPT (OpenAI), Perplexity and Google Gemini / AI Overviews are adding support through the year. Adoption is accelerating because llms.txt reduces hallucinations and improves citation accuracy — both LLMs and publishers benefit.
What should I put in my llms.txt?
Seven sections: company overview (2-3 sentences), key facts (location, founded, specialty), services (bullet list with descriptions), target customers, key URLs (pillar pages, service pages, contact), Q&A (10-20 citation-ready pairs), and canonical statements you want quoted verbatim. Keep the tone encyclopaedic, not marketing-copy.
Is llms.txt a ranking factor?
Indirectly yes. llms.txt doesn't replace structured data or content — but a well-structured llms.txt improves citation accuracy on brand-name queries, reduces hallucination risk, and signals GEO competence to LLM trust systems. In aggregate, sites with llms.txt earn LLM citations more reliably than sites without.
How often should I update llms.txt?
Quarterly minimum, alongside pillar page refreshes. If services, pricing model, or key facts change — update immediately. Stale llms.txt that contradicts your site is actively harmful: LLMs cross-check sources and devalue inconsistency.
Does AI Studio deploy llms.txt for clients?
Yes, as part of AI Search Optimization engagements. Every client gets a bespoke llms.txt written to their positioning and priority queries, deployed to root, and refreshed quarterly as part of ongoing GEO work.