Does Google run JavaScript?

Googlebot does, eventually. AI crawlers from OpenAI, Anthropic and Perplexity don’t, so the same page can rank on Google and still be invisible in AI answers.

How do I fix an empty page?

Server-render or pre-render key pages: Next.js SSR or static generation, Astro, Nuxt, or a prerender service.

How many words is enough?

We flag under 150 words as thin. What matters is that the text answering your buyer’s question is in the HTML.

Yes. Every tool is free with no signup.

Do you store what I enter?

Browser tools never leave your device. Live tools fetch the URL you enter and don’t save the result.

How is this different from the site audit?

This tool checks one thing in depth. The site audit checks everything at once and scores SEO, AI Search and Agent Readiness.

Tools / AI crawlers & agents

See your page the way an AI crawler does

GPTBot, ClaudeBot and PerplexityBot don’t run JavaScript. See the exact text they get, and whether your page is an empty shell.

Free, no signup.

Page URL

Example result: smoothrecorder.com · checked 2026-09-30

What an AI crawler receives

Verdict	✓ Readable without JavaScript
HTTP	200 · 288ms
Words in raw HTML	1993
HTML size	420 KB
Script tags	17
Title	Smooth Recorder: Record Beautiful Demos on Mac, Without Editing

Why it matters

AI crawlers read raw HTML

A Vercel study of 500M+ crawler fetches found OpenAI, Anthropic and Perplexity bots don’t execute JavaScript.

Client-rendered pages look blank

If your content appears only after React or Vue runs, AI engines see a loading spinner and move on.

It’s invisible in a browser

Your page looks perfect to you. Nothing warns you that bots got nothing.

What it checks

Words in raw HTML

How much readable text arrives before any JavaScript runs.

Empty-shell detection

Spots the classic <div id="root"></div> single-page-app pattern.

HTML size

Very heavy HTML is slow for every crawler to parse.

Script count

How much of the page depends on JavaScript.

Title

Whether the title is in the HTML or injected later.

Readable text preview

The first 1,500 characters exactly as a crawler reads them.

How it works

Enter a URL

A domain or page address. No install, nothing to add to your site.

We fetch it live

Our servers request the page read-only, the way a crawler would.

Read and fix

Get the results in seconds, with what each one means.

Questions

More in AI crawlers & agents

AI Bot Access CheckerTest robots.txt and a live request for GPTBot, ClaudeBot, PerplexityBot and the agent user-agents. Catches firewall blocks.Agent Discovery CheckerLook for markdown pages, MCP server cards, API catalogs, agent cards, UCP and signed-agent keys.llms.txt CheckerFetch and validate /llms.txt and /llms-full.txt against the llmstxt.org format.

Check everything at once

The site audit checks your whole site and scores SEO, AI Search and Agent Readiness in about 30 seconds.

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