Following is the list of 10 free Google SEO tools, most of these tools are good for keyword research and on page SEO. Some of them you may already know and using, some you may not. While when you using them, do remember to take the numbers with a grain of salt, they are never completely accurate but in many cases it works fine.

1. Google Webmaster Tools

Google webmaster tools help you identify broken links, malware and other issues, it helps you find out what search queries lead to your pages even with click through statistics. It even checks your website speed, if your website is slow, it tells you why.

2. Google Analytics

If in case you still don’t know GA you have probably slept for years. Some SEOs don’t use it due to paranoia of being controlled by Google. Google analytics solution gives you rich insights into your website traffic and marketing effectiveness. The new powerful, flexible and easy-to-use features let you see and analyze your traffic data in an entirely new way.

3. Google Search Based Keyword Tool

This very neat tool allows you to find out related keywords for your website or existing keyword or rather both. It’s connected to Google Insights for Search.

4. Google Website Optimizer

You can test different versions of your pages with Google website optimizer, it helps you to determine the best converting ones. A/B split testing or multivariate testing and is all the rage lately in SEO circles and beyond.

5. Google Zeitgeist

Google Zeitgeist is not a tool in the strictest sense but you can use it as reference for keyword and key phases research. The current Zeitgeist aka Hot Trends report list also tell you lots of things, so don’t forget to check it out.

6. Google Insights for Search

With Google insights for search, you can compare search volume patterns across specific regions, categories, time frames and properties. It is like Google Trends on steroids. You can look up most keywords even those not popular ones.

7. Google Trends

Google Trends lets you compare traffic for popular search terms and websites. From the results, you can determine whether a topic is rising in popularity or not. It works great combine together with Google Zeitgeist and Google Insight for Search.

8. Google Ad Planner

You can use Google Ad Planner to screen popular sites or your competitors for keyword intelligence.

9. Google Traffic Estimator

You can get quick traffic estimates for new keywords without adding them to an account by using this tool.

10. Google Keyword Tool

Use the keyword tool to get new keyword ideas, it is like the Traffic Estimator but from a different angle. You may want to check both seo tools to make sure you’re on the right track with your keywords.