What is robots.txt and why is it important?

robots.txt is a plain text file at the root of your website that tells search engine crawlers which URLs they can and cannot access. It's the first file a search engine bot reads when visiting your site. While it doesn't prevent pages from being indexed (use noindex for that), it controls crawl behavior and can accidentally block search engines from discovering your content entirely.

How do I fix a robots.txt that blocks search engines?

First, check if you have a "Disallow: /" rule that blocks all crawlers. Replace it with specific Disallow rules for only the paths you want to block (like /admin/ or /api/). Make sure your User-agent directive targets the right bots — "User-agent: *" applies to all crawlers. Always include a Sitemap directive pointing to your sitemap.xml.

Can a bad robots.txt kill my SEO?

Yes. A robots.txt with "Disallow: /" tells all search engines to stop crawling your entire site. This is the #1 cause of zero organic traffic after launch — staging environments often have this rule, and it can easily get deployed to production by accident. LintPage was built specifically to catch this kind of issue.

Should I have a robots.txt file even if I want everything indexed?

Yes. Even if you want all pages indexed, a robots.txt file should exist to reference your sitemap.xml and block paths that don't need crawling (like /api/ or /admin/). An empty or missing robots.txt is a missed opportunity to guide crawlers efficiently and can waste your site's crawl budget.

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Robots.txt Validator

Make sure your robots.txt isn't accidentally blocking Google from crawling your site — the #1 cause of zero organic traffic after launch.

How It Works

Three steps. Zero setup. Instant results.

Enter your URL

Paste any page URL into the tool. No signup or account needed.

See what's broken

Get a clear list of issues ranked by severity, with plain-English explanations.

Fix and ship

What This Tool Checks

Your robots.txt file is the first thing search engines read when they visit your site. A single syntax error or an overly broad Disallow rule can block Google from crawling your entire site — and you won't know until your traffic drops to zero. This tool validates your robots.txt for syntax errors, missing directives, and accidental blocks.

File existence and accessibility at /robots.txt

Syntax validation for User-agent and Disallow directives

Overly broad blocking rules (e.g., Disallow: /)

Sitemap reference in robots.txt

Crawl-delay directives and their impact

Conflicting or redundant rules

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