Robots.txt Validator

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Audit and Validate Robots.txt for Search Engines & AI Bots

Your robots.txt file is the first file search engine crawlers check when visiting your website. It establishes the ground rules for how Googlebot, Bingbot, and AI web scrapers crawl your pages. A single formatting error or an accidental disallow directive can quietly prevent search engines from indexing your high-priority content.

Our Robots.txt Validation Tool will validate your file using the guidelines set out by the Robots Exclusion Protocol standard (RFC 9309). Validate live URLs from your domain or input your rules to validate syntax, blocked pages, sitemaps, and access policies for robots powered by AI technology.

Common Robots.txt Errors & How They Hurt SEO

Even a small mistake in your robots.txt file can ruin your crawl budget or prevent Googlebot from indexing your pages. Check out these mistakes and the effects on search below.

Configuration MistakeUnderlying CauseSearch Engine Impact
Disallow: / on User-agent: *Catch-all disallow directive which was accidentally left during staging/testing.Entirely removes website from search engine indexation.
Blocking CSS or JavaScript FilesDisallowing /wp-content/themes/ or *.js.Googlebot cannot render mobile templates and calculate page experience.
Rules before User-agentAllow/Disallow directive placed in the beginning of file without User-agent declaration.Regular crawlers will ignore the orphaned directive altogether.
Sitemap Directive Not IncludedFailing to add the Sitemap: URL line in the robots.txt file.Makes the crawling process slower for the new articles and products.
Incorrect Case UsageAdding /Admin/ when it should be /admin/.Enables bots to access private folders.
Incorrect Wildcard PatternsThe use of unsupported symbols like regex.Causes unexpected crawling and bot directive ignoring.

Why Validate Your Robots.txt File?

Make sure that search engine robots can index your most important pages, disregard any private directories, and find your sitemap.

Detect Syntax Errors Fast

Identify typos, missing colons, directives not recognized by the search engines, and misplaced rules.

Prevent Accidental Site De-indexing

Capture global Disallow rules that inadvertently block Googlebot and Bingbot crawlers from indexing the entire website.

Live URL Access Testing

Test the individual page URL against Googlebot, Bingbot, or even your own bots following the normal RFC 9309 precedence ordering.

Audit AI Web Scrapers

Check crawl policies for current AI bots such as GPTBot, ClaudeBot, PerplexityBot, and Google-Extended.

Verify Sitemap Declarations

Check that your XML sitemap URLs are absolute, which helps search engines find every page.

Protect Rendering Assets

Spot rules that block CSS and JavaScript files, making sure crawlers can correctly render and score your pages.

Get clear answers about crawler directives, bot precedence, Googlebot behavior, and how to correctly set up your robots.txt file.

Frequently Asked Questions About Robots.txt Validation

A robots.txt validator is an online tool that parses and audits your robots.txt file against official Robots Exclusion Protocol standards. It checks directive syntax, finds blocking errors, verifies sitemap paths, and confirms whether search crawlers can reach specific URLs.
The live URL tester in our validator lets you check any path on your website against Googlebot. Enter a URL, choose Googlebot, run the test, and see instantly whether it is allowed or blocked.
Your robots.txt file must always be stored at the root folder of your website. For example, if your website is www.example.com, then your robots.txt should be available at www.example.com/robots.txt. Any other location, such as /blog/robots.txt, will cause it to be ignored by search engines.
No. A disallow rule in robots.txt only stops bots from crawling the page. If other sites link to it, Google can still index the URL without reading its content. To remove indexed URLs, use a noindex robots meta tag or HTTP header.
According to the RFC 9309 guidelines, the search engine will test all applicable rules for a particular user agent and will choose the one with the largest matching character length. If there is a tie between an Allow and a Disallow rule, the latter wins.
However, if you would like to ensure that AI corporations don’t train their LLMs using your proprietary articles or documents, then you could use the Disallow rule for crawling agents such as GPTBot, ClaudeBot, and Google-Extended.
The Sitemap tag helps search crawlers get acquainted with the site structure right from the first visit. It is useful to help find new content quickly on large blogs and catalogs of online stores.
Crawl-delay specifies how many seconds the bots need to wait between visits to pages. Crawl delay is recognized by Bing and Yandex, but not by Googlebot. You can configure crawl delay for Googlebot in Google Search Console.
User-agent and Disallow directives are not case sensitive, while URLs after such directives are case sensitive. Thus, Disallow: /admin/ will not prevent search engine bots from accessing /Admin/ or /ADMIN/.
No registration and no installation required. Our robots.txt parser works right in your browser, parses text instantly, and never saves your website content to any third-party databases.

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Disclaimer

The Robots.txt Validator evaluates crawler directives following RFC 9309 standards. The results are given only for diagnostic reference. Crawl activity should be checked in Google Search Console.