What do AI crawlers actually see?
Most AI crawlers don't run JavaScript. This tool fetches your page the way they do and shows the text that's really in the HTML, so you can spot content they can't read.
Free · No signup required
About this tool
How LLM HTML Visibility Checker works.
Why JavaScript matters
If your page builds its content in the browser with JavaScript, a crawler that only reads the HTML gets an empty shell. It can't quote or cite what it can't see.
What we measure
Words in the raw HTML, headings, links, images, structured data, the title and meta description, and the share of the HTML that is real text.
How to fix it
Use server-side rendering or static generation so the text is in the HTML your server sends, not added later by scripts.
Frequently asked questions.
Common questions about the llm html visibility checker.
Many do. GPTBot, ClaudeBot and PerplexityBot generally fetch HTML without rendering it. Googlebot does render JavaScript, but later and with limits.
Browsers run your scripts. Crawlers often don't. This tool shows the version without scripts.
About 150 or more words of real text in the raw HTML is a healthy sign. Under 50 words on a script-heavy page is a red flag.
No. It's free and needs no account.