All tools

robots.txt Validator

Network

Parse a robots.txt file into User-agent groups and flag directive syntax mistakes: rules before any User-agent, unknown directives, non-absolute Sitemap URLs, malformed Crawl-delay values, and duplicate rules

Paste a robots.txt file and see exactly how a crawler would parse it: which User-agent groups exist, which rules belong to each one, and where the syntax breaks down. It catches the mistakes that quietly break crawl control, like a Disallow line placed before any User-agent (which most crawlers just ignore), a Sitemap URL that isn't absolute, or a Crawl-delay value that isn't a number. It also flags softer issues as warnings, like an Allow or Disallow path missing its leading slash or the same rule repeated twice in one group, so you can tell at a glance what's actually broken versus what's just untidy.

robotsseocrawlervalidator

How to use robots.txt Validator

  • 1.Paste the contents of your robots.txt file into the input box.
  • 2.Review the issues list: errors mean a crawler will likely misinterpret the file, warnings are stylistic or redundant but not necessarily wrong.
  • 3.Check the parsed groups panel to confirm each User-agent's Allow/Disallow rules and Crawl-delay match what you intended.

Frequently asked questions

Does this fetch robots.txt from a live URL?
No, you paste the raw text directly. It doesn't make any network requests, so it works for files that aren't deployed yet.
What counts as an error versus a warning?
Errors are things that break crawling outright: a malformed line, a directive appearing before any User-agent, a non-absolute Sitemap URL, or an invalid Crawl-delay. Warnings are softer issues like an unknown directive, a missing leading slash on a path, or a duplicate rule or User-agent, none of which necessarily stop a crawler.
Does it understand wildcard patterns in Disallow/Allow paths?
It checks that a path starts with '/' or '*' but doesn't evaluate wildcard matching semantics against real URLs, since crawler wildcard support varies (Google supports '*' and '$', not every crawler does).
Does it check whether the rules actually block or allow a given URL?
No, this is a structural and syntax validator only. It doesn't simulate a crawler decision for a specific URL.

Use via API, SDK, or MCP

cURL# Free: 1,000 req/day · Pro: 10,000 req/day
curl -X POST https://api.utilix.tech/v1/tools/robots-txt-validator \
  -H "Authorization: Bearer utx_live_..." \
  -H "Content-Type: application/json" \
  -d '{"text":"User-agent: *\nDisallow: /admin\nSitemap: https://example.com/sitemap.xml"}'

Get an API key from your dashboard · Full API docs →

Related tools

Sitemap.xml ValidatorValidate a sitemap.xml or sitemap index against the sitemaps.org protocol: required tags, absolute URLs, valid changefreq/priority/lastmod values, and duplicate entriesNetworkCredit Card Number ValidatorValidate a credit card number via the Luhn checksum and detect its network (Visa, Mastercard, American Express, Discover, Diners Club, JCB, Maestro, UnionPay) from its prefix and lengthMathOG Meta Tag GeneratorGenerate and preview Open Graph and Twitter card meta tagsCode