Can robots.txt block AI crawlers from citing me?

Yes. If GPTBot, ClaudeBot, or similar are disallowed, that AI system generally cannot crawl your site to learn about it or cite it in answers.

What's the difference between robots.txt and a noindex tag?

Robots.txt tells crawlers not to access a page at all. A noindex meta tag lets a crawler access the page but tells it not to include that page in search results. They solve different problems and are often confused.

Is this as complete as Google's own Search Console robots.txt tester?

This covers the same core validation and simulation logic, plus the AI-crawler-specific check Search Console doesn't offer. For deep technical SEO issues beyond robots.txt, a full audit goes further.

Free Tools · Robots.txt Tester & Validator

CHECKS AI CRAWLERS, NOT JUST GOOGLEBOT

One wrong line can undo everything

Fetch and validate any site's robots.txt, test whether a specific bot can access a specific path, and see whether AI crawlers like GPTBot and ClaudeBot are blocked.

Test your robots.txt

We fetch the live file, not a cached copy.

○ Awaiting your domain—

AI crawler access will appear here.

We fetch your live robots.txt, parse it, and check it against the AI crawlers most tools ignore.

Syntax errors and full-site blocks flagged.
GPTBot, ClaudeBot, PerplexityBot, Google-Extended, CCBot and others checked.
Test any bot against any path with the simulator.

Generated fresh on every run

What This Tool Checks

A real fetch and parse, not a cached copy

Syntax validation

Flags common mistakes — directives with no User-agent line above them, unrecognized directives, and a full-site block under User-agent: *.

Bot access simulator

Test whether a specific bot (Googlebot, GPTBot, ClaudeBot, and more) can access a specific path, using the same longest-match precedence rule search engines use.

AI crawler check

Checks GPTBot, ClaudeBot, PerplexityBot, Google-Extended, CCBot, and others against your rules — most robots.txt tools only check traditional search bots.

How to use this tool

Enter a domain, test a path

Enter your domain

We fetch your live robots.txt file directly.

Review the validation

See any syntax issues and which AI crawlers are allowed or blocked.

Test specific paths

Use the simulator to check whether a specific bot can access a specific URL path.

Fix and re-check

Update your robots.txt file, then run the check again to confirm.

No account required, and nothing you enter is stored beyond an anonymous usage count.

Why this matters

Blocked crawlers means never cited

1A misconfigured robots.txt can accidentally block Google entirely, or block CSS/JS files search engines need to render your pages properly.

2AI answer engines (ChatGPT, Claude, Perplexity) use their own crawlers — if those are blocked, your site can never be cited in AI answers, no matter how good your content is.

3This is one of the few places a single line of misconfiguration can undo months of SEO work.

4Checking AI crawler access specifically is a newer, GEO-specific consideration most traditional robots.txt tools still don't cover.

Questions

Frequently Asked Questions

A plain-text file at the root of a domain (yoursite.com/robots.txt) that tells web crawlers which parts of the site they're allowed to access.

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One wrong line can undo everything

Test your robots.txt

AI crawler access will appear here.

A real fetch and parse, not a cached copy

Syntax validation

Bot access simulator

AI crawler check

Enter a domain, test a path

Enter your domain

Review the validation

Test specific paths

Fix and re-check

Blocked crawlers means never cited

Frequently Asked Questions

More Free Tools

Related Reading

A Practical Core Web Vitals Checklist for 2026

How Does ChatGPT Decide Which Businesses to Recommend?

Schema Markup for AI Search: What It Actually Does (2026 Guide)

Want experts to handle your technical SEO?

One wrong line can undo everything

Test your robots.txt

AI crawler access will appear here.

A real fetch and parse, not a cached copy

Syntax validation

Bot access simulator

AI crawler check

Enter a domain, test a path

Enter your domain

Review the validation

Test specific paths

Fix and re-check

Blocked crawlers means never cited

Frequently Asked Questions

More Free Tools

Related Reading

A Practical Core Web Vitals Checklist for 2026

How Does ChatGPT Decide Which Businesses to Recommend?

Schema Markup for AI Search: What It Actually Does (2026 Guide)

Want experts to handle your technical SEO?

One wrong line can undo everything

Test your robots.txt

AI crawler access will appear here.

A real fetch and parse, not a cached copy

Syntax validation

Bot access simulator

AI crawler check

Enter a domain, test a path

Enter your domain

Review the validation

Test specific paths

Fix and re-check

Blocked crawlers means never cited

Frequently Asked Questions

01What is robots.txt?

02Can robots.txt block AI crawlers from citing me?

03What's the difference between robots.txt and a noindex tag?

04Is this as complete as Google's own Search Console robots.txt tester?

More Free Tools

Related Reading

A Practical Core Web Vitals Checklist for 2026

How Does ChatGPT Decide Which Businesses to Recommend?

Schema Markup for AI Search: What It Actually Does (2026 Guide)

Want experts to handle your technical SEO?

One wrong line can undo everything

Test your robots.txt

AI crawler access will appear here.

A real fetch and parse, not a cached copy

Syntax validation

Bot access simulator

AI crawler check

Enter a domain, test a path

Enter your domain

Review the validation

Test specific paths

Fix and re-check

Blocked crawlers means never cited

Frequently Asked Questions

01What is robots.txt?

02Can robots.txt block AI crawlers from citing me?

03What's the difference between robots.txt and a noindex tag?

04Is this as complete as Google's own Search Console robots.txt tester?

More Free Tools

Related Reading

A Practical Core Web Vitals Checklist for 2026

How Does ChatGPT Decide Which Businesses to Recommend?

Schema Markup for AI Search: What It Actually Does (2026 Guide)

Want experts to handle your technical SEO?