A robots.txt checker is a tool web developers and SEO specialists use to analyze a website's robots.txt file. The robots.txt file is a simple text file that resides in the root directory of a website and is the first thing search engine crawlers look at when they visit a website.

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The purpose of the robots.txt file is to instruct web robots (often referred to as "bots") which areas of the site they are allowed or disallowed to crawl and index. This can be useful for preventing crawlers from accessing certain parts of your website, such as admin pages or pages that you do not want to appear in search results.

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A robots.txt checker helps ensure that your robots.txt file is correctly formatted and can be appropriately interpreted by search engine crawlers. It helps identify errors or issues preventing bots from crawling and indexing your site correctly.

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A robots.txt checker tool can be used to:

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1. Analyze the robots.txt file of any website
2. Check if the robots.txt file exists and is accessible
3. Validate the syntax of the directives in the file
4. Identify errors or issues that could impact how search engines interpret the file
5. Test if certain URLs are allowed or disallowed for specific user agents