FREE LINTER & SYNTAX AUDIT

robots.txt Validator & Linter

Test and validate any robots.txt syntax. Catch blocking errors, unknown directives, and AI engine accessibility issues in real time.

robots.txt Content
Syntax & AI Score
85/100
Valid & AI-Ready

Diagnostics (1)

GPTBot Blocked

Explicitly disallowing GPTBot prevents ChatGPT from learning about and citing your content.

RFC 9309 Linter & Diagnostics

How the robots.txt Syntax Validator Works

Robots Exclusion Protocol syntax errors can silently de-index entire sections of your website or completely lock out AI search citation crawlers like ChatGPT and Perplexity.

01

Syntax & Directive Check

Checks for unrecognized directives, missing User-Agent declarations, case-sensitivity flaws, and missing leading slashes in path rules.

02

AI Crawler Block Detection

Flags whether your file blocks critical AI search engines (OAI-SearchBot, PerplexityBot, ClaudeBot, Google-Extended) without an explicit intent.

03

Sitemap URL Validation

Ensures that all Sitemap: directives provide valid, absolute HTTPS URLs reachable by automated bots.

Frequently Asked Questions about robots.txt Validation

What is the most common robots.txt mistake?

Writing Disallow: / under User-agent: *, which unintentionally blocks every search engine on the internet from indexing your site.

Are Crawl-delay directives supported by Google?

No. Googlebot ignores the Crawl-delay: directive. Bing and Yandex still support it, but Google recommends managing crawl rate in Search Console instead.

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