MatrixAdapt | Logiciel de gestion d'Entreprise, Création et référencement des sites web

Recently, Danny Sullivan brought up good questions about how search engines handle meta tags. Here are some answers about how we handle these tags at Google.

Multiple content values
We recommend that you place all content values in one meta tag. This keeps the meta tags easy to read and reduces the chance for conflicts. For instance:

<META NAME="ROBOTS" CONTENT="NOINDEX, NOFOLLOW">

If the page contains multiple meta tags of the same type, we will aggregate the content values. For instance, we will interpret

<META NAME="ROBOTS" CONTENT="NOINDEX">
<META NAME="ROBOTS" CONTENT="NOFOLLOW">

The same way as:

<META NAME="ROBOTS" CONTENT="NOINDEX, NOFOLLOW">

If content values conflict, we will use the most restrictive. So, if the page has these meta tags:

<META NAME="ROBOTS" CONTENT="NOINDEX">
<META NAME="ROBOTS" CONTENT="INDEX">

We will obey the NOINDEX value.

Unnecessary content values
By default, Googlebot will index a page and follow links to it. So there's no need to tag pages with content values of INDEX or FOLLOW.

Directing a robots meta tag specifically at Googlebot
To provide instruction for all search engines, set the meta name to "ROBOTS". To provide instruction for only Googlebot, set the meta name to "GOOGLEBOT". If you want to provide different instructions for different search engines (for instance, if you want one search engine to index a page, but not another), it's best to use a specific meta tag for each search engine rather than use a generic robots meta tag combined with a specific one. You can find a list of bots at robotstxt.org.

Casing and spacing
Googlebot understands any combination of lowercase and uppercase. So each of these meta tags is interpreted in exactly the same way:

<meta name="ROBOTS" content="NOODP">
<meta name="robots" content="noodp">
<meta name="Robots" content="NoOdp">

If you have multiple content values, you must place a comma between them, but it doesn't matter if you also include spaces. So the following meta tags are interpreted the same way:

<META NAME="ROBOTS" CONTENT="NOINDEX, NOFOLLOW">
<META NAME="ROBOTS" CONTENT="NOINDEX,NOFOLLOW">

If you use both a robots.txt file and robots meta tags
If the robots.txt and meta tag instructions for a page conflict, Googlebot follows the most restrictive. More specifically:

• If you block a page with robots.txt, Googlebot will never crawl the page and will never read any meta tags on the page.
• If you allow a page with robots.txt but block it from being indexed using a meta tag, Googlebot will access the page, read the meta tag, and subsequently not index it.

Valid meta robots content values
Googlebot interprets the following robots meta tag values:

• NOINDEX - prevents the page from being included in the index.
• NOFOLLOW - prevents Googlebot from following any links on the page. (Note that this is different from the link-level NOFOLLOW attribute, which prevents Googlebot from following an individual link.)
• NOARCHIVE - prevents a cached copy of this page from being available in the search results.
• NOSNIPPET - prevents a description from appearing below the page in the search results, as well as prevents caching of the page.
• NOODP - blocks the Open Directory Project description of the page from being used in the description that appears below the page in the search results.
• NONE - equivalent to "NOINDEX, NOFOLLOW".

A word about content value "NONE"
As defined by robotstxt.org, the following direction means NOINDEX, NOFOLLOW.

<META NAME="ROBOTS" CONTENT="NONE">

However, some webmasters use this tag to indicate no robots restrictions and inadvertently block all search engines from their content.

Update: For more information, please see our robots meta tag documentation.

You asked, and we listened: We've extended our support for querying links to your site to much beyond the link: operator you might have used in the past. Now you can use webmaster tools to view a much larger sample of links to pages on your site that we found on the web. Unlike the link: operator, this data is much more comprehensive and can be classified, filtered, and downloaded. All you need to do is verify site ownership to see this information.

Downloading links data
There are three different ways to download links data about your site. The first: download the current view of the table you see, which lets you navigate to any summary or details table, and download the data in the current view. Second, and probably the most useful data, is the list all external links to your site. This allows you to download a list of all the links that point to your site, along with the information about the page they point to and the last time we crawled that link. Thirdly, we provide a similar download for all internal links to your site.


We do limit the amount of data you can download for each type of link (for instance, you can currently download up to one million external links). Google knows about more links than the total we show, but the overall fraction of links we show is much, much larger than the link: command currently offers. Why not visit us at Webmaster Central and explore the links for your site?