Robots.txt Lint Validator

Robots.txt Lint Validator | Online Free Tool | Elysia Tools

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category: Validation
Input types: textarea, file, text
Output type: json
Sample coverage: 4
API ready: Yes

Overview

Validate your robots.txt files for syntax errors, check for risky crawler directives, and test critical URLs against your rules before deploying them to production.

When to use

Before deploying a new robots.txt file to production to prevent accidental search engine de-indexing.
When troubleshooting why search engine crawlers are not indexing specific pages or directories.
During website migrations or redesigns to verify that staging rules are correctly updated for the live site origin.

How it works

1Paste your robots.txt content directly into the text area or upload your robots.txt file.
2Enter your site origin URL and list the specific paths or URLs you want to test.
3Run the validator to parse the syntax, identify structural errors, and check which test URLs are allowed or disallowed.

Use cases

Auditing staging robots.txt files to ensure sensitive admin paths are blocked before going live.
Testing if critical landing pages or blog posts are accidentally blocked by broad wildcard rules.
Verifying syntax compliance with major search engine crawler standards.

Examples

1. Preventing Admin Directory Indexing

SEO Specialist

Background

An SEO specialist is preparing to launch a new website and wants to ensure search engines do not crawl the admin panel while keeping the help section accessible.

Problem

A draft robots.txt has a syntax error where the colon is missing in the Disallow rule, which might cause crawlers to ignore the directive.

How to use

Paste the draft robots.txt content, set the site origin to 'https://example.com', and add '/admin' and '/admin/help' to the test URLs list.

robotsText: "User-agent: *\nDisallow /admin\nAllow: /admin/help"
siteOrigin: "https://example.com"
testUrls: "/admin\n/admin/help"

Outcome

The tool flags the syntax error on the Disallow rule, allowing the specialist to correct it to 'Disallow: /admin' before deployment.

2. Testing Wildcard Rules for Blog Paths

Web Developer

Background

A developer is updating the robots.txt file to block temporary preview URLs but wants to ensure live blog posts remain crawlable.

Problem

Complex wildcard rules might accidentally match and block valid blog URLs like '/blog/post-1'.

FAQ

What does this tool validate in a robots.txt file?

It checks for syntax errors, missing colons, invalid directives, and tests specific URLs against your rules.

Can I test URLs with different origins?

You should specify the correct Site Origin in the input field to ensure relative paths are resolved and tested accurately.

Why is my Disallow rule flagged as an error?

Common issues include missing colons after directives, incorrect wildcards, or invalid user-agent declarations.

Does this tool support sitemap declarations?

Yes, it parses and validates the format of Sitemap directives within your robots.txt file.

Can I upload a robots.txt file directly?

Yes, you can upload your robots.txt file using the file input option instead of copying and pasting.

robotsText: "User-agent: *\nDisallow: /blog/*-preview\nAllow: /blog/"
siteOrigin: "https://example.com"
testUrls: "/blog/my-first-post\n/blog/draft-preview"

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Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Preventing Admin Directory Indexing

2. Testing Wildcard Rules for Blog Paths

FAQ

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