Which search engine supports which robots meta tag values?

This table shows which search engines support which values:

Robots value	Google	Yahoo!	MSN / Live	Ask
index	Yes	Yes	Yes	Yes
noindex	Yes	Yes	Yes	Yes
none	Yes	Doubt	Doubt	Yes
follow	Yes	Doubt	Doubt	Yes
nofollow	Yes	Yes	Yes	Yes
noarchive	Yes	Yes	Yes	Yes
nosnippet	Yes	No	No	No
noodp	Yes	Yes	Yes	No
noydir	No use	Yes	No use	No use

The different robots meta tag values

An explanation of all the different values you can use in the robots meta tags:

index

Allow search engines robots to index the page, you don’t have to add this to your pages, as it’s the default.

noindex

Disallow search engines from showing this page in their results.

noimageindex

Disallow search engines from spidering images on that page. Of course, if images are linked to directly from elsewhere, Google can still index them, so using an X-Robots-Tag HTTP header is a better idea.

none

This is a shortcut for noindex,nofollow, or basically saying to search engines: don’t do anything with this page at all.

follow

Tells the search engines robots to follow the links on the page, whether it can index it or not.

nofollow

Tells the search engines robots to not follow any links on the page at all.

noarchive

Prevents the search engines from showing a cached copy of this page.

nocache

Same as noarchive, but only used by MSN/Live.

nosnippet

Prevents the search engines from showing a snippet of this page in the search results and prevents them from caching the page.

noodp

Used to block search engines from using the description for this page in DMOZ (aka ODP) as the snippet for your page in the search results. However, DMOZ doesn’t exist anymore.

noydir

Blocks Yahoo! from using the description for this page in the Yahoo! directory as the snippet for your page in the search results. No other search engines use the Yahoo! directory for this purpose, so they don’t support the tag. Since Yahoo! closed its directory this tag is deprecated, but you might come across it once in awhile.

The resources from the search engines

The search engines themselves have pages about this subject as well:

• Google did a blogpost on the Google Webmaster Central Blog
• Bing has a webmaster help page for it
• Yandex has a help page for HTML meta tags.

And of course there’s always the official robots.txt pages and Danny Sullivan’s big robots meta write up.

You can block all robots at once by the markup above, or just block one robot by specifying it specifically:

Google

GOOGLEBOT

Yahoo!

SLURP

MSN / Live

MSNBOT

Ask

TEOMA