Enter a URL and click TEST to fetch and validate the robots.txt.
Paste a robots.txt file or fetch one from a live URL, and this testing tool checks every User-agent block, Allow and Disallow rule, wildcard, and sitemap reference against how Googlebot and other major crawlers actually read them.
What Is a Robots.txt File?
Robots.txt is a plain-text file placed at the root of a domain (example.com/robots.txt) that tells search engine crawlers which parts of a site they’re allowed to request. It uses simple directives — User-agent, Allow, Disallow, and Sitemap — and applies before a crawler ever loads a page. It controls crawling, not indexing, which is why a blocked page can sometimes still show up in search results.
What This Tool Checks
Every check runs the moment you paste a file or enter a domain.
Directive syntax
Flags malformed or misspelled directives, missing colons, and incorrect user-agent groupings.
Crawler precedence logic
Applies the same specificity rules Googlebot uses when Allow and Disallow rules overlap on the same path.
Blocked asset detection
Flags rules that disallow CSS, JS, or image folders needed for Google to render pages correctly.
Sitemap validation
Confirms the Sitemap directive exists, is correctly formatted, and points to a reachable URL.
Wildcard behavior
Shows exactly which paths a * or $ pattern matches, so nothing is blocked by accident.
Per-URL testing
Enter any page path and see whether it’s Allowed or Disallowed for a specific user-agent.
How to Use This Tool
1. Paste your file or enter a domain
Paste raw robots.txt content directly, or enter a domain and the tool fetches the live file automatically.
2. Run the check
The tool parses each rule and flags anything conflicting, overly broad, or likely to block resources you need crawled.
3. Test a specific URL
Enter a page path to see which rule applies to it and whether a chosen crawler is allowed to access it.
4. Fix and re-check
Update the file on your server and re-run the test to confirm the flagged rule is resolved before you move on.
Robots.txt Directives Explained
| Directive | What It Does | Example |
| User-agent | Specifies which crawler the rules below it apply to. | User-agent: Googlebot |
| Disallow | Blocks the specified path from being crawled by the matched user-agent. | Disallow: /checkout/ |
| Allow | Overrides a broader Disallow rule for a more specific path. | Allow: /checkout/faq/ |
| Sitemap | Points crawlers to the location of an XML sitemap. | Sitemap: https://site.com/sitemap.xml |
| * | Wildcard matching any sequence of characters within a path. | Disallow: /*?sort= |
| $ | Anchors a rule to the end of a URL. | Disallow: /*.pdf$ |
Common Robots.txt Errors This Tool Catches
- Disallow: / left over from staging, which blocks crawling of the entire live site.
- Blocked CSS or JS folders that prevent Google from rendering pages the way users see them.
- Conflicting Allow and Disallow rules on overlapping paths, where the wrong one takes precedence.
- Broken or missing Sitemap URL, pointing to a 404 or an unreachable domain.
- Case-sensitivity mistakes, since robots.txt paths are matched exactly, including capitalization.
- Wildcard rules that overreach, unintentionally blocking more URL patterns than expected.
Frequently Asked Questions
What does a robots.txt validator actually check?
It checks your robots.txt file for syntax errors, conflicting Allow and Disallow rules, incorrect wildcard usage, missing or malformed sitemap references, and directives that accidentally block CSS, JS, or entire site sections from being crawled.
Can a wrong robots.txt file get my site deindexed?
Yes. A single Disallow rule placed at the wrong path level, such as Disallow: / left over from a staging environment, can block search engines from crawling your entire live site.
Is this robots.txt testing tool free to use?
Yes. You can paste a file or fetch a live URL and run unlimited checks at no cost.
Does robots.txt affect SEO rankings directly?
Robots.txt does not directly influence rankings, but it controls whether crawlers can access your pages at all. If a page cannot be crawled, it generally cannot be indexed or ranked, which makes robots.txt errors an indirect but serious ranking risk.
Does robots.txt block a page from Google’s index?
Not always. Robots.txt blocks crawling, not indexing. A blocked URL can still appear in search results without a description if it’s linked from elsewhere. To fully remove a page from the index, use a noindex meta tag on a page Google is allowed to crawl.
Run the Check Before Google Does
Paste your robots.txt file into the live tool at guestpostsale.com/tools/robots-txt/ and see every flagged rule in seconds.