A keyword bid tool usually focuses on automated functions like bid settings and keyword management. These are vital functions once your campaign is up and running. But the tools with this focus are leaving out the most important aspect of your campaign.

A keyword density tool can be extremely useful for checking the content you generate for article marketing or web pages. The right keyword density will insure that your content looks natural and useful to the search engines. Of course the best way to make your content natural is to write your content so it is interesting and easy to read for humans.

A keyword density tool will only give you one piece of the pie when it comes to optimizing your content for the mighty Google or other search engines. There are other factors that are much more important. But density gets a lot of discussion because it was once a much more important factor in search rankings and it is easy to do so it makes a great optimization tip.

Your keyword density tool probably will not tell you this but current experience suggests that keyword density should be approximately one to two percent. Some say less some say as much as five percent but the truth is no one really knows and search algorithms are too complex to break it down to a single optimization parameter.