Free Robots.txt Checker
Validate Before Google Crawls
One wrong line in your robots.txt file can accidentally block Google from crawling your entire website and you’d never know until your traffic disappeared. Check it now, before it becomes a real problem.
Validate Your Robots.txt File Free
Enter your website URL below and we’ll fetch, parse, and validate your robots.txt file checking crawl rules, disallow paths, user-agent directives, and sitemap references.
Robots.txt Checker
Enter a domain to check its robots.txt file and see blocked/allowed paths.
What Is a Robots.txt File and Why a Single Mistake Can De-Index Your Entire Website?
Your robots.txt file is a plain text file that sits at the root of your website at yourdomain.com/robots.txt and it tells search engine crawlers which parts of your website they are and are not allowed to visit. It’s one of the first files Google’s crawler checks when it visits your site.
Used correctly, robots.txt is a powerful tool. It prevents Google from wasting crawl budget on admin pages, duplicate content, internal search result pages, and other areas that don’t need to be indexed. It keeps your crawl budget focused on the pages that actually matter for your SEO, your service pages, blog posts, product pages, and landing pages.
Used incorrectly, it’s one of the most damaging mistakes in all of SEO. A single misplaced Disallow: / directive blocks Google from crawling everything on your entire domain. This mistake is far more common than you’d expect it happens during theme updates, plugin installations, staging site migrations, and developer changes. The result is a complete rankings collapse that can take weeks to diagnose if you don’t know where to look.
In 2026, with Google’s crawler now also feeding data into Google AI Mode and AI Overview systems, what Google can and cannot crawl directly affects not just your traditional rankings but your visibility in AI-generated search answers too. A misconfigured robots.txt doesn’t just hurt your SEO, it makes you invisible to the entire modern search ecosystem.
⚠️ The Most Dangerous Line in SEO
The directive Disallow: / under User-agent: * blocks every search engine crawler from every page on your website. It looks harmless. It is catastrophic. Our checker flags this and other high risk configurations the moment it finds them before Google does.
Crawl Rule Validation
We parse every Allow and Disallow directive in your robots.txt and flag anything that could be accidentally blocking important pages from Google’s crawlers.
Sitemap Reference Check
Your robots.txt should reference your XML sitemap. We verify it’s there, correctly formatted, and pointing to the right URL a small thing that helps Google discover your pages faster.
User-Agent Directive Review
Different crawlers Googlebot, Bingbot, AI crawlers can be controlled separately. We check that your user-agent directives are correctly set up and not accidentally targeting the wrong bots.
High-Risk Flag Detection
We instantly flag the most dangerous misconfigurations global disallow rules, missing sitemaps, conflicting directives so you can fix critical issues before they cost you rankings.
After validating your robots.txt, the next step is making sure your internal links are healthy too. Run our Broken Link Checker to find any dead links on your key pages. And to make sure your pages have the structured data that Google and AI search need, use our Schema Markup Generator.
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Frequently Asked Questions
Disallow: / under User-agent: *, blocks every search engine from every page on your site. This mistake has happened to major websites and resulted in complete ranking collapses. It commonly occurs during staging site migrations, theme changes, or developer errors which is why regular validation is essential.