Google webmaster tool provides Robots.txt generator.

Robots.txt is very useful for webmasters to prevent any webpages they wish not to be indexed in search engines.There are many tools available in the internet for creating Robots.txt, but google is the first searchengine to provide this kind of tool.

Google webmaster tools has an in-built robots.txt generator.You can find this Robots.txt generator in the tools section of google webmaster tools.

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