If you are using Blogger and learning SEO, you have probably come across the term custom robots.txt. It may look technical at first, but understanding it is important because this small text file gives search engine crawlers instructions about which parts of your blog they can access.
A properly configured robots.txt file can help keep unnecessary Blogger URLs out of search engine crawling. However, it is equally important to understand what robots.txt does not do. It does not make your pages rank higher by itself, and a wrong rule can prevent Google from crawling pages that you actually want to appear in search results.
In this guide, we will explain what cutom robots.txt for Blogger is, why it matters for SEO, how to enable it, what a safe configuration looks like, and the mistakes you should avoid.
What Is Robots.txt?
Robots.txt is a text file located at the root of a website. Search engine crawlers can read this file before crawling URLs on the site.
For example, a Blogger site may have a robots.txt address like:
https://yourblog.blogspot.com/robots.txt
The file contains instructions using directives such as User-agent, Disallow, and Allow.
The important thing to remember is that robots.txt is primarily a crawling instruction, not a ranking instruction.
If you tell a crawler not to access a particular URL or directory, you are asking it not to crawl that location. That is different from telling Google not to index a page.
This distinction becomes especially important when configuring Blogger SEO.
Why Does Robots.txt Matter for Blogger SEO?
Blogger automatically creates different types of URLs. Apart from individual blog posts and pages, your site can contain search-result URLs, label pages, archive pages, and other generated URLs.
Not every URL needs to be treated equally from an SEO perspective.
Your most important URLs are generally your actual articles and pages. These are the pages you want Google to understand, index, and potentially rank.
A robots.txt configuration can help search engines avoid spending crawling resources on URLs that are not useful as search landing pages.
However, don't think of robots.txt as a shortcut to better rankings. Your rankings still depend heavily on the quality and usefulness of your content, relevance to search queries, internal linking, technical accessibility, and your site's overall authority.
Does Blogger Already Have a Robots.txt File?
Yes. Blogger automatically provides a robots.txt file.
If you have never changed the setting, you can still access your robots.txt URL.
However, Blogger also provides an option for users who want to create a custom robots.txt configuration.
You can generally find this under the Blogger settings related to crawlers and indexing.
Before changing anything, understand exactly what each directive does. Robots.txt is one of those SEO settings where a small mistake can have a large effect.
How to Enable Custom Robots.txt in Blogger
Open your Blogger dashboard and go to your blog's Settings. Look for the Crawlers and indexing section. There you can find the option for Custom robots.txt. When you enable the option, Blogger allows you to enter your own robots.txt instructions.
This is the point where you should be careful. Do not copy a random robots.txt file from another website simply because it claims to be an "SEO optimized" configuration. A robots.txt file should be appropriate for your website's structure.
A Basic Example
A commonly used starting structure for a Blogger site is:
User-agent: *
Disallow: /search
Allow: /
Sitemap: https://yourblog.blogspot.com/sitemap.xml
Let's understand what each line means.
User-agent: *
The User-agent: * directive applies the following instructions to all crawlers that follow the standard robots.txt protocol.
In simple terms, you are saying that the instructions below are intended for crawlers generally.
Disallow: /search
Blogger can generate search URLs under the /search path.
For example, a search URL may look something like:
https://yourblog.blogspot.com/search?q=seo
If you do not want crawlers spending time crawling these internal search URLs, the /search path can be disallowed.
This does not mean that every URL containing the word "search" should automatically be blocked. The rule applies to URLs matching the specified path.
Allow: /
The Allow: / line indicates that the root and paths under it are generally allowed to be crawled, subject to other rules.
Because robots.txt syntax can interact in ways that beginners may not expect, avoid adding complicated rules unless you understand their effect.
Sitemap
The sitemap line tells crawlers where they can find your XML sitemap.
For a Blogger blog, this can be:
Sitemap: https://yourblog.blogspot.com/sitemap.xml
Replace the domain with your actual blog address.
Robots.txt Does Not Remove a Page From Google
This is one of the most important concepts to understand. Suppose you block a URL using robots.txt. That does not necessarily mean Google can never show that URL in its search results.
Google needs to be able to crawl a page to properly process many of its indexing signals. If you block crawling but Google discovers the URL elsewhere, the URL can potentially still be known to Google.
If your goal is to prevent a page from being indexed, noindex is generally the more appropriate mechanism when Google can crawl the page and see the directive.
This is why you should not use robots.txt as a replacement for Blogger's custom robots header tags. The two settings solve different problems.
Robots.txt and Custom Robots Header Tags Are Different
Blogger provides both custom robots.txt and custom robots header tags, and beginners often confuse them. Robots.txt primarily controls crawling. A robots meta/header directive such as noindex controls indexing.
For example, you may decide that certain archive or search-result pages should not appear in Google's index. In that situation, an appropriate noindex configuration can be more suitable than simply blocking those URLs in robots.txt.
Understanding this distinction will help you avoid many common technical SEO mistakes.
How to Test Your Blogger Robots.txt
After saving your custom robots.txt configuration, open:
https://yourblog.blogspot.com/robots.txt
Replace the example domain with your own. Read through the file and check that the rules are exactly what you intended. You should pay particular attention to whether important article URLs or folders are accidentally blocked.
Google Search Console can also help you investigate crawling and indexing problems. If an important page is not indexed, use the URL Inspection tool to investigate its status rather than immediately changing robots.txt.
Common Robots.txt Mistakes Blogger Users Make
One of the biggest mistakes is copying a robots.txt file without understanding it. A configuration that works for one website may not be appropriate for another.
Another mistake is blocking too much. If you accidentally disallow important content, search engines may not be able to crawl those pages normally.
Some bloggers also believe that adding every possible Disallow rule makes a site more SEO-friendly. It doesn't. Robots.txt should be kept purposeful and simple.
You should also avoid repeatedly changing your robots.txt file because of temporary ranking fluctuations. If your rankings drop, investigate content quality, indexing, search intent, competition, internal links, and other SEO factors before assuming robots.txt is responsible.
Should You Modify Robots.txt on Every Blogger Blog?
Not necessarily. If your Blogger blog is small and your default configuration is working correctly, there may be little reason to make complicated custom changes.
The purpose of custom robots.txt is to give you more control, not to create technical complexity. If you do customize it, keep the rules minimal and make sure you understand what each one does.
How Robots.txt Fits Into Your Blogger SEO Strategy
Robots.txt is only one part of technical SEO. Your Blogger SEO strategy should also include a properly configured sitemap, Search Console, mobile-friendly design, clean internal linking, optimized images, good page speed, and high-quality content.
For example, your sitemap helps Google discover your important URLs, while robots.txt can help control which areas crawlers should access. Internal links then provide additional paths for Google to discover and understand your articles.
These elements work together. If you have already published your Blogger Sitemap Setup Guide, link to it from this article. You can also link this article to your guide on How to Rank a Blogger Blog on Google. This creates a useful internal-linking structure within your Blogger SEO topic cluster.
Conclusion
Custom robots.txt for Blogger is not something you should change just because another SEO blog recommends it. The goal is not to create the longest or most complicated robots.txt file. The goal is to give search engine crawlers clear and appropriate instructions.
For most Blogger blogs, a simple configuration that allows important content to be crawled while limiting unnecessary search URLs is a sensible starting point.
Before making changes, always understand the difference between crawling and indexing. That single distinction can prevent many technical SEO problems.