How to Check if AI Crawlers Can Access Your Site (Step-by-Step Guide)
ChatGPT, Claude, Perplexity and Google’s Gemini no longer just answer questions from what they memorized during training — they read the live web, quote sources, and recommend links inside their answers. Whether your site can appear in those answers is largely decided by a handful of lines in one small file: robots.txt. In this guide you will learn how to check if AI crawlers can access your site in under a minute, how to read the results like a pro, and what to do if you discover that GPTBot, ClaudeBot or PerplexityBot is locked out. If you have ever asked yourself “is my site blocked from ChatGPT?”, the answer is sitting in your root directory, and we will read it together.
Why AI Crawler Access Matters
For two decades, organic visibility meant one thing: ranking in Google and Bing. That world is still important, but it is no longer the whole picture. Millions of people now start research inside AI assistants, and when an assistant cites a source, that source earns a click, a mention, and a measure of trust. This emerging discipline is often called GEO — Generative Engine Optimization — and step one of GEO is embarrassingly simple: make sure the AI systems can actually read your content.
AI companies send dedicated bots to fetch pages. OpenAI uses GPTBot, Anthropic uses ClaudeBot, Perplexity uses PerplexityBot, and each of them checks your robots.txt before crawling, exactly like Googlebot does. If a bot finds a rule that blocks it, it quietly skips your site. No warning, no email, no Search Console-style notification. Your pages simply never make it into that vendor’s training data, index, or answer pipeline. That may be exactly what you want — or it may be an accident inherited from a copy-pasted robots.txt template.
There is a real business consequence either way. Allow the crawlers and your content can be quoted, summarized and linked by AI assistants, which increasingly drives referral traffic. Block them and you keep full control of your content at the cost of AI visibility. The one strategy that clearly loses is not knowing which situation you are in. A five-minute audit removes that uncertainty.
How to Check If AI Crawlers Can Access Your Site (Step by Step)
Step 1: Open the AI Crawler Checker
Go to the free AI Crawler Checker tool. It fetches any site’s robots.txt through a server-side request and evaluates it against the nine most important AI crawlers, plus Googlebot and Bingbot as reference points. There is nothing to install and no signup.
Step 2: Enter your domain
Type your domain, for example example.com, or paste any full URL from your site — a blog post, a product page, anything. The tool automatically normalizes the address, keeps only the origin, and requests /robots.txt from the root. You do not need to type the protocol.
Step 3: Read the summary line
The first thing you see is a headline like “7 of 9 AI crawlers allowed”. That single sentence answers the question “who can get in?”. Below it, every crawler gets its own row with a colored status pill and a one-line explanation of why it received that verdict.
Step 4: Understand the four statuses
- Allowed (green) — the bot may crawl. If only some paths are excluded, such as
/wp-admin/, the note shows exactly which Disallow rules apply. - Blocked (red) — the matching group contains
Disallow: /, which blocks the entire site for that bot. - No rule (gray) — no rule targets this bot. Under the robots exclusion protocol, no rule means full permission, so the bot is allowed by default.
- Warning (yellow) — the matched group mixes Allow and Disallow directives, so access is decided path by path. Worth a manual look.
Step 5: Verify manually (optional but recommended)
Open https://yoursite.com/robots.txt in a browser and read it yourself. Look for a User-agent: line that names the bot you care about, followed by its rules. Remember the two golden rules of interpretation: an exact User-agent: GPTBot group overrides the general User-agent: * group, and matching is case-insensitive. If you maintain a WordPress site and want a deeper walkthrough of the file itself, read our guide on how to create robots.txt for WordPress.
Step 6: Fix what needs fixing
Found a block you did not intend? Remove or narrow the Disallow rule, or generate a clean, GEO-friendly file from scratch with the Robots.txt Generator. Then re-run the AI Crawler Checker to confirm the change took effect — the whole loop takes about a minute.
The Major AI Crawlers at a Glance
You do not need to memorize every bot on the internet, but these six names cover the majority of AI-related crawling decisions you will ever make. Facts below reflect each vendor’s published documentation.
GPTBot (OpenAI)
GPTBot is OpenAI’s crawler for fetching web content used to train and improve its current and future models. OpenAI publishes the token and documents how to allow or block it with robots.txt, which makes it the single most commonly audited AI bot. Blocking GPTBot stops OpenAI’s model-training fetches; allowing it means your public pages can end up in training corpora.
ChatGPT-User (OpenAI)
ChatGPT-User is the companion token that fetches a page only when a human ChatGPT user explicitly asks the assistant to open or browse a link. It is user-triggered rather than autonomous. Sites that block model-training crawlers sometimes deliberately leave user-triggered tokens open, so a page can still be read when an actual person requests it.
ClaudeBot (Anthropic)
ClaudeBot is Anthropic’s crawler, used to collect web content for training and improving Claude models. Anthropic also documents related tokens for user-initiated fetches and search, so if Claude visibility matters to you, check your rules against ClaudeBot first and the companion tokens second.
PerplexityBot (Perplexity)
PerplexityBot is operated by Perplexity AI and crawls pages used to answer user questions and feed Perplexity’s answer engine index. Because Perplexity’s product is live question answering with citations, being crawlable by PerplexityBot is directly tied to showing up as a cited source in Perplexity answers.
Google-Extended (Google)
Google-Extended is a special robots.txt token published by Google that lets site owners control whether their content helps improve Google’s generative AI products, such as the Gemini app and Vertex AI. It is not a traditional search crawler: blocking Google-Extended does not affect Google Search indexing or rankings, and allowing it does not guarantee inclusion either. It exists purely as an AI-training and grounding opt-out switch.
CCBot (Common Crawl)
CCBot belongs to Common Crawl, a non-profit that builds a free, open archive of web pages. That archive is widely used by researchers and AI teams as training data, so many model builders never fetch your site directly — they consume Common Crawl’s copy instead. Blocking CCBot removes your site from future crawl snapshots, though it cannot remove pages already archived.
Best Practices for Managing AI Crawler Access
Make a decision instead of inheriting one. The worst robots.txt files are the ones nobody remembers creating. Whether you choose openness or restriction, write it down and review it twice a year.
Block precisely, not globally. A blanket Disallow: / under User-agent: * removes you from Google, Bing, and every AI assistant in one line. If you only meant to stop one vendor, name that vendor’s token in its own group. Local blocks such as Disallow: /wp-admin/ are fine and expected — they exclude private paths without touching your content.
Keep user-triggered bots in mind. Blocking training crawlers while allowing user-directed fetches (like ChatGPT-User) is a popular middle ground: your pages stay out of training data but can still be read when a real person asks an assistant to open them.
Remember that robots.txt is a request, not a wall. Reputable vendors honor it, but it is not an authentication mechanism. For hard guarantees, use server-level access rules instead. Treat robots.txt as a channel for communicating your preferences to well-behaved bots.
Re-check after every change. WordPress plugins, security suites and hosting panels sometimes rewrite robots.txt without asking. A quick pass through the checker after any site change keeps surprises out of your traffic reports, and pairing it with the Robots.txt Generator lets you go from audit to corrected file in one sitting.
Go beyond robots.txt when you embrace GEO. Once the bots can crawl, help them understand your site with an llms.txt file — see our LLMS.txt Generator to create one.
Frequently Asked Questions
How do I check if AI crawlers can access my site?
Enter your domain into a checker like the AI Crawler Checker, which fetches your robots.txt and shows whether GPTBot, ClaudeBot, PerplexityBot and other AI crawlers are allowed, blocked, or unregulated. Alternatively, open yoursite.com/robots.txt yourself and look for User-agent: groups naming those bots.
Is my site blocked from ChatGPT by default?
No. If you have no robots.txt at all, or no rule that mentions OpenAI’s bots, then everything is allowed by default — the robots exclusion protocol only restricts when a rule explicitly says so. Blocking only happens when someone added a matching Disallow rule.
What is the difference between GPTBot and ChatGPT-User?
GPTBot autonomously crawls the web to collect content for training and improving OpenAI models, while ChatGPT-User fetches a specific page only when a ChatGPT user explicitly asks the assistant to browse that link. They are controlled by separate robots.txt tokens, so you can allow one and block the other.
Does robots.txt force AI bots to stop crawling?
No. Robots.txt is a voluntary standard. Major vendors such as OpenAI, Anthropic, Perplexity and Google honor it, but it cannot technically stop a badly behaved bot. If you need enforcement, combine robots.txt with server-level blocks such as firewall rules.
Will blocking GPTBot remove my content from ChatGPT?
Not instantly and not guaranteed. Blocking GPTBot stops OpenAI’s crawler from fetching your pages going forward, but it does not retroactively remove content that was already crawled, licensed from third parties, or included in older training datasets. Think of it as closing the door, not erasing the past.
The Bottom Line
AI assistants have become a discovery channel that behaves a lot like search, and the gate to that channel is your robots.txt. Checking it takes one minute with the free AI Crawler Checker, interpreting it takes the four-status legend above, and correcting it takes one more minute with the Robots.txt Generator. Decide deliberately whether ChatGPT, Claude and Perplexity may read your site — and then verify that the file actually says what you think it says. Your future AI-referred visitors will thank you.