Robots.txt Guide: Everything You Need to Know

Robots.txt is one of the most important technical SEO files on any website. It tells search engine crawlers which areas of your website they are allowed to crawl and which areas should remain private. Although it looks like a simple text file, using it incorrectly can negatively affect your SEO, while using it correctly helps search engines crawl your website more efficiently.

What is Robots.txt?

Robots.txt is a plain text file placed in the root directory of your website. Search engine crawlers such as Googlebot, Bingbot, and other bots check this file before crawling your website.

It follows the Robots Exclusion Protocol (REP) and contains simple rules that tell crawlers which URLs or folders they should crawl and which they should ignore.

Why is Robots.txt Important for SEO?

• Helps search engines crawl important pages first.
• Prevents crawling of duplicate or unnecessary pages.
• Improves crawl budget efficiency.
• Protects private directories from being crawled.
• Makes website crawling more organized.

Basic Robots.txt Example

User-agent: *
Disallow: /admin/
Disallow: /private/

Sitemap: https://example.com/sitemap.xml

Common Directives

User-agent

Specifies which crawler the rules apply to.

User-agent: Googlebot

Disallow

Blocks crawling of specific folders or files.

Disallow: /checkout/

Allow

Allows access to specific files inside blocked folders.

Allow: /images/logo.png

Sitemap

Helps search engines discover your XML Sitemap.

Sitemap: https://example.com/sitemap.xml

Best Practices

• Always keep robots.txt in the root directory.
• Reference your XML sitemap.
• Test the file before publishing.
• Don't block CSS or JavaScript unless necessary.
• Avoid blocking pages you want indexed.
• Review the file after major site updates.

Common Mistakes

• Blocking the entire website accidentally.
• Using incorrect syntax.
• Forgetting to add the sitemap URL.
• Blocking important assets.
• Assuming robots.txt prevents indexing.

Frequently Asked Questions

Does robots.txt prevent indexing?

No. It prevents crawling, not necessarily indexing.

Where should robots.txt be located?

In the root of your domain, for example: https://example.com/robots.txt

Should every website have one?

Yes. Even a simple robots.txt file helps search engines understand your crawling preferences.