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Ultimate Collection of Free SEO Tools

This is a categorized listing of free SEO tools you can use for optimizing websites. For each category I give a short introduction about what the tools do. Most of them have an English interface and are web based.

Some tools need to be installed on a web server or a client connected to the Internet which is indicated in the introductory text or next to the link. Have fun trying out these free SEO tools!

Swiss Army Knives for SEO

These SEO tools check multiple SEO metrics in one step: Google PageRank, Alexa Rank, Compete Rank, Quantcast Rank, Google Backlinks, Yahoo Backlinks, MSN Live Search Backlinks, Technorati Links, del.icio.us Bookmarks, Rojo links, Bloglines subscribers.

Firefox SEO Extensions

It should come as no surprise that you need Firefox to use the following tools. Similar to the Swiss army knives above many of the Firefox extensions listed perform various SEO related tasks and allow you to check: Google PageRank, Google Category, Alexa Rank, Compete Rank, Alexa related links and backward links from Google, Yahoo!, Alexa and MSN.

Search Engine Tools

Tools available from major search engines.

Keyword Research and Analysis

These tools are useful for keyword research, keyword analysis, checking keyword frequency, and getting keyword suggestions.

Keyword Ranking Tools

Tools for checking the search engine rankings for specified keywords on your site and/or top ranking sites (keyword competition).

Keyword Density Tools

Tools for analyzing the keyword density of web pages.

Google PageRank Tools

Tools for checking, monitoring, and predicting Google PageRank.

Backlink Checkers

Tools for checking backlinks and anchor texts found in various search engines and suggestions for linkbuilding.

Link Popularity / Link Value

Tools that measure the popularity and/or value of a link based on various criteria. Some off these tools can be embedded into websites to show off your immense popularity.

Link Tools

Tools for extracting links and searching websites for broken links.

Web Statistics and Tracking

Tools for analyzing website traffic and visitor tracking.

Crawling Test and Speed Check Tools

Tools for checking out how search engine crawlers (spiders) "view" web pages and how fast they are downloaded with different Internet connection bandwidths.

Meta Tag Tools

Tools for generating, optimizing, and extracting meta tags.

Domain Tools

Tools for retrieving data about domains, such as age and ip address, tools for finding expired domains, and domain name suggestion tools.

HTTP header viewer

Tools for viewing the HTTP header send to clients after requesting web pages.

Top Search Words / Search Buzz

Information on top search words by search engines, market places, news and blog aggregators, and download portals.

Misc Tools

Tools that don't fit into any of the above categories.

I tested all of these SEO tools to make sure they are useful and worth to be listed here. Did I miss a great tool? You can suggest other free SEO tools in your comments. Enjoy!