We’ve grouped the meta robots tag and robots.txt file into the same category since they both do similar things, in different ways. One of them is a file, the other one is an HTML tag however they both can allow or deter search engine bots from crawling your website.

The robots.txt file is a file that you create that exists on your server that tells bots like Google and Bing (as well as some “bad” bots) where to crawl and where not to crawl. This file mainly exists as a guide for bots to show them where, and sometimes how often to crawl.

Example: Our robots.txt file

For instance you really don’t want the “admin” area of your website being viewed by most users, so you can tell Google not to crawl it by not allowing it.

Similarly, if you really want to ensure a certain section of your website is being crawled, you can indicate that within the robots.txt file as well.

Most sites have a very limited “crawl budget” i.e. the amount of pages that will be crawled each time Googlebot visits your site. That said, you really want to optimize Googlebot’s time when it visits your site. You don’t want Google wasting its time on irrelevant sections of your website when it could be crawling more important sections.

robots tx tester seo tutorial

The robots.txt file for LinkedIn is a great example of a well thought out robots.txt file. Last we checked it had over 1000 lines of entries. On a massive website like this, they really need to consider which parts of the website they want opened for Google to crawl especially since they have over 200,000,000 (200 million) results in Google.

Curve ball: you can disallow a URL within the robots.txt file, but Google still might index that. I’ll rephrase that: just because you tell Google not to allow a URL, doesn’t mean it is going to listen to you.

With that in mind, it isn’t a great idea to count on the robots.txt file to block or unblock pages in the search engines. The robots.txt file is much better suited as a guideline for Googlebot to help it crawl large and important areas of your website.

If you really want a deep understanding of the robots.txt file, Google wrote a very detailed specification on the Google Developers website.

A robots.txt file probably won’t make or break your SEO plan of action, but it will probably help.

Robots.txt Examples in for SEO

Robots.txt allowing CSS and JavaScript

This has been a popular topic of conversation in recent months, especially since Google has been handing out so man warnings about blocking CSS and JavaScript. One solution is to add this to your robots.txt. This will ensure that your server will not block any JavaScript or CSS.

User-Agent: Googlebot
Allow: .js
Allow: .css 

This example tells Yahoo (code named “Slurp” not to crawl your website)

User-agent: Slurp
Disallow: /cgi-bin/

This example tells all robots that they can crawl all files on this particular website.

User-agent: *

This example tells all robots not to crawl the website at all.

User-agent: *
Disallow: /

This example tells all robots not to crawl these specific directories

User-agent: *
Disallow: /administrator/
Disallow: /login.php/
Disallow: /private-files/

This example tells all robots to not crawl one file in particular

User-agent: *
Disallow: /directory/file.html


Meta Robots Tag

The meta robots tag is a tag that you can add to the header of your website, to give certain robots such as Googlebot instructions on how to crawl your website. For a quick example, this is how a few of them would look.

<meta name="robots" content="noindex">

<meta name="robots" content="nofollow">

While the meta-robots tag probably isn’t a direct ranking factor itself, it can still play a vital role in the overall optimization (SEO) of your website.

There are a number of different parameters that you can use in the meta robots tag, here is a table illustrating some of the more popular ones and the crawlers that recognize them.

Robots Value Google Yahoo / Bing
index Yes Yes
noindex Yes Yes
nofollow Yes Yes
none Yes Maybe
follow Yes Maybe
noodp Yes Yes
noarchive Yes Yes
nosnippet Yes No

For the purpose of this post, we’ll mainly be talking about search engine bots such as Googlebot and Slurp (aka Yahoo.)

Index, Noindex

The meta robots index tag to make sure to index that particular page. Conversely, the noindex tag will tell the crawler not to index the page. The kicker here is that sometimes even if you “noindex” a page it will still be displayed in the search results. If you really don’t want Google to index your website, our advice is to not list it on the open web, or password protect it.

A good example of the noindex parameter would be for pages such as admin or login pages that you don’t want Google to crawl. These pages can not only tax your server resources but can confuse users if they see them in the search results.

Follow, nofollow

The nofollow parameter tells crawlers not to follow links within that page. Conversely the follow tag tells crawlers to explicitly follow links within that page.

Other parameters

Other parameters aren’t nearly as popular as they used to be. Noodp tells the Open Directory Project (DMOZ) not to list the site in its directory. The noarchive tells the crawler not to list the website in its archive. One reason why sites might choose to deny these crawlers is because they can take up a lot of server resources crawling around a website.

For the most part, most users don’t really need to use the majority of these tags with the exception of noindex and nofollow.

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