For search engines to understand your website and display the right content, they need clear instructions. That’s where the robots.txt file comes in. Small and inconspicuous, yet a crucial tool—it lets you control which parts of your site can be crawled by search engines and which should be blocked. For website owners, it’s indispensable: it helps optimize crawl behavior, reduce server load, and focus attention on the pages that truly matter.
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What is the robots.txt file?
robots.txt is a text file that gives instructions to bots and crawlers about which parts of a website may be crawled and which should not. The file is an important part of search engine optimization (SEO) because it helps ensure that certain pages or files are not visited or read by crawlers/bots.
Where can I find the robots.txt file?
The robots.txt file is stored in the root directory of a website. To find it, simply type the site’s address in your browser followed by “/robots.txt” (e.g., weventure.de/robots.txt).
How does the robots.txt file work?
robots.txt works by giving web crawlers, such as Googlebot, instructions on which pages and files may be crawled and which should be blocked. When a crawler visits a site, it always checks the robots.txt file first to see which parts of the site it’s allowed to access.
The robots.txt file is made up of directives that crawlers interpret.
Here are some example directives from a robots.txt file:
User-agent: *
This means the instructions apply to all bots.
User-agent: Screaming Frog SEO Spider Disallow: / # Directories Disallow: /core/ Disallow: /profiles/ Disallow: /contact_page/
In this case, the Screaming Frog crawler is instructed not to visit the /core/, /profiles/, and /contact_page/ folders.
Testing robots.txt – how it’s done
Before relying on your robots.txt to work as intended, you should always test it. There are several ways to do this:
- Check directly in the browser
Go toyourdomain.com/robots.txtto immediately see which rules are publicly available. - Google Search Console
Use the “URL Inspection” tool to check if Google can crawl a specific page. The old robots.txt Tester is deprecated, but the URL Inspection tool provides similar insights. - SEO tools
Tools like Screaming Frog, Ryte, or Semrush let you simulate how crawlers interpret your site based on robots.txt.
👉 Tip: If you’re unsure, you can also have your robots.txt professionally audited. As a technical SEO agency in Berlin, we regularly analyze and optimize robots.txt files as part of our projects—making sure websites are crawled efficiently and that the right content is highlighted in search engines. Reach out to us anytime.
robots.txt examples
disallow
The Disallow directive is used to prevent crawlers from accessing specific pages or directories on a website. By using Disallow, you tell search engines which parts of your site should not be crawled or indexed.
Example:
User-agent: Googlebot Disallow: /vertrauliche_informationen/
This example tells Googlebot not to crawl any pages or files in the /confidential_information/ directory.
allow
Allow is a keyword in the robots.txt file used to permit crawlers to access certain pages or files, even if the directory is otherwise blocked.
However, “Allow” is not strictly necessary—if nothing is listed in robots.txt, everything is allowed by default. It’s most often used to grant access to individual files inside a blocked directory.
A common WordPress example:
User-agent: * Allow: /wp-admin/admin-ajax.php
The admin-ajax.php file enables communication between the server (your hosting) and the client (Googlebot) via AJAX. WordPress uses it to update page content without a full reload. That’s why the Allow directive here is perfectly valid.
‼️ Important: The robots.txt file does not provide absolute security. There’s no guarantee that all crawlers will respect its directives. For protecting sensitive information, you should always implement additional security measures such as login restrictions or two-factor authentication.
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Why is robots.txt important for SEO?
robots.txt is important for website owners to ensure their pages and files are crawled correctly. There are many reasons why you might want to exclude certain pages or files from search engines—for example, to increase security, reduce server load by blocking certain bots, or focus search engines on your most important pages. It’s also recommended to reference your sitemap in the file. Since crawlers check robots.txt first when visiting a site, the file becomes especially valuable for large or international websites to direct crawling behavior and keep bots focused on priority content.
robots.txt vs. noindex – why “Disallow” isn’t always enough
A common misconception is that robots.txt controls whether a page appears in Google’s index. That’s not the case:
- robots.txt Disallow → only prevents crawling. The URL can still be indexed if it’s discovered elsewhere.
- Meta tag noindex → removes the page from the index—but only if Google is allowed to crawl it first (a Disallow rule prevents Google from even seeing the noindex).
When Disallow backfires
Imagine you block a directory like /excel-spreadsheets/:
User-agent: *
Disallow: /internal-documents/
But then a partner site—or even your own blog—links there, maybe with a joking anchor text like:
“Here you’ll find the secret Excel spreadsheets with all the sales 😅”
Google can’t crawl the page, but it sees the link and may index the URL anyway—using that anchor text as the snippet.
Result: your “secret” pages appear in search results even though you intended to hide them.
Google itself confirms:
„A page that’s disallowed in robots.txt can still be indexed if linked to from other sites (…) URL address and, potentially, other publicly available information such as anchor text in links to the page can still appear in Google search results.“
SEO forums are full of cases where blocked pages still landed in the index with unwanted anchor text.
Best practice from our projects
A strong example of why a well-planned robots.txt matters is our work with Breitling, one of the world’s leading luxury watch brands.
With over 130 country- and language-specific site versions, crawl budget was quickly overloaded—causing the wrong versions to appear in search results in some markets.
Our Approach:
- First, we analyzed which language-country combinations were actually relevant and which had little or no search volume.
- Then, we optimized robots.txt so that Google could consistently crawl the important variants while excluding unnecessary ones.
- At the same time, we ensured that at least one correct language version per country remained indexable.
The result: far more efficient crawling and a clean delivery of the right pages in each market.
💡 Pro tip: Especially for international setups, it’s worth regularly reviewing your robots.txt for accuracy and completeness. This ensures Google focuses on the right content and your crawl budget isn’t wasted on irrelevant pages. If you need support: our technical SEO experts in Berlin are here to help.
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Conclusion
The robots.txt file is a valuable tool for controlling how search engines access certain areas of a website. But it’s important not to treat it as a cure-all. It only governs crawling, not indexing—and that’s where confusion often arises. Even if a page is blocked, it can still show up through external links, sometimes with odd or irrelevant anchor text.
That’s why a thoughtful SEO strategy goes beyond simply adding entries to the file. A smarter approach combines targeted crawl management with the use of noindex tags and additional measures like password protection for sensitive content. By keeping these levers in mind, you can guide your crawl budget more efficiently, avoid unwanted entries in the index, and ensure the pages that really matter get the spotlight.
At the end of the day, this small text file is nothing more than a signal—the real work lies in setting clear priorities for your site and implementing them with technical consistency.
FAQ: robots.txt
What does “blocked by robots.txt” mean?
If a page or directory is marked with Disallow in the robots.txt file, it tells search engine crawlers not to fetch that content. However, the URL itself is still known and can appear in the index—for example, if external websites link to it. The result: the page may show up without a snippet, often displaying only the URL or the anchor text from the link.
