How to Test If Your Content Is LLM-Friendly (Complete Checklist)
Is AI ignoring your site? Follow our 5-step checklist to test LLM-readability. Learn how to audit your HTML for ChatGPT, Perplexity, and AI search engines
AI models read your raw HTML, not the rendered page. Here’s a step-by-step checklist to test whether your content is actually visible to ChatGPT, Perplexity, and AI search engines — and how to fix what isn’t.
AI models don’t browse your site. They extract text from raw HTML. Strip away the design, remove the animations, delete the CSS — what’s left is all that matters to an LLM. For most websites, it’s a mess of JavaScript fragments, empty divs, and missing context.
If your headline is an image, it doesn’t exist to AI. If your key value proposition loads via JavaScript, it might not either. That interactive section? Invisible.
This matters because AI-powered search is how a growing share of people find and evaluate content. If an LLM can’t read your page, you’re not in the conversation.
Step 1: View Source (Ctrl+U)
The fastest diagnostic. Open any page and press Ctrl+U (Windows) or Cmd+Option+U (Mac) to see the raw HTML as crawlers receive it.
Search for your actual content — your main headline, your key value propositions, your primary body text.
Good sign: Clear <h1>, <h2>, and <p> tags with readable text inside them.
Red flag: Mostly <script> tags, <canvas> elements, or empty <div> containers. If your content isn’t in the source, AI can’t see it.
Step 2: The No-CSS Mental Model
Picture your page with zero styling. Does the information hierarchy still make sense? Are your key points communicated in text, or do they depend on visual treatment?
Anything that relies on CSS or design to communicate meaning is invisible to AI. If a section only makes sense because of its layout, colour, or imagery — not its text — it won’t register.
Step 3: Check Your Semantic Structure
AI models use HTML tags to understand content hierarchy and relationships. Generic <div> containers give no context. Semantic tags do.
Check that your page uses: - <h1> for the primary heading — one per page - <h2> / <h3> for section headings in logical order (not chosen for font size) - <p> for body text - <article>, <main>, <section> for structural context
In Webflow specifically: the Designer defaults to Div Blocks. You can assign proper semantic tags in the element settings panel — it takes seconds per element and makes a significant difference to how AI systems parse your content hierarchy.
Step 4: Token Efficiency Check
LLMs process text in chunks called tokens. Certain content patterns waste tokens without adding information:
- Decorative Unicode — special characters and symbols fracture into dozens of meaningless tokens
- Excessive emojis — break word boundaries and inflate token counts
- Text embedded in images — contributes zero tokens because it’s not text
- Repetitive boilerplate — navigation text, legal disclaimers, and cookie notices that appear on every page consume context window space that could be used for your actual content
More efficient structure means more of your actual message fits in an AI’s context window during retrieval.
Step 5: Check robots.txt for AI Crawlers
Go to yoursite.com/robots.txt and look for any rules that disallow GPTBot — that’s the user agent ChatGPT uses to crawl the web. A single misconfigured disallow rule blocks ChatGPT entirely from your site.
On Webflow, this can happen through custom code or hosting settings without any obvious visual indicator. If GPTBot is blocked here, no other optimisation matters until it’s fixed.
Webflow-Specific Moves
Once the basics are solid, these Webflow-specific steps take you further:
Add llms.txt
The /llms.txt standard is a plain-text file that guides AI crawlers to your most important pages. Webflow supports it natively.
Setup: Project Settings → SEO Tab → upload your llms.txt file.
Audit Your Metadata
Webflow’s Audit Panel catches missing alt text and weak meta descriptions. AI search engines often pull directly from metadata when citing sources — make it accurate and descriptive.
Assign Semantic HTML in the Designer
Select any element → open the element settings panel → change the tag from Div to the appropriate semantic element. Priority targets: your navbar wrapper (<nav>), page sections (<section>), main content area (<main>), and blog post content (<article>).
Frequently Asked Questions
How do AI models read websites differently from humans?
AI models extract only text from raw HTML. They don’t see CSS styling, JavaScript-rendered content, or text embedded in images. If content isn’t in the HTML source, it doesn’t exist to AI.
What’s the fastest way to check if my site is AI-readable?
Use Ctrl+U to view source, then search for your key headlines and value propositions. If they’re not in the HTML as plain text, AI can’t read them.
Do I need to redesign my entire site for AI readability?
No. Focus on ensuring your core content — headlines, body text, CTAs — exists as semantic HTML. Visual design can stay the same.
What is token efficiency, and why does it matter?
LLMs process text in chunks called tokens. Decorative Unicode and excessive formatting waste tokens without adding meaning, reducing how much actual content fits in AI’s context window during retrieval.
Will AI-readable structure hurt my visual design?
No. Semantic HTML tags (<h1>, <article>, <section>) are invisible to users but critical for AI. Your CSS controls all visual appearance independently.
Want to understand how LLM search actually works — what happens between a user’s question and the answer they see? See How LLM Search Works.
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