Free SEO Usability Tools

Browser Screen Resolution Checker

It is important to test a web site in as many ways as possible: view it in different screen resolutions, various computer platforms and different browsers. Find out how your web page looks like with the viewer's monitor set to different screen resolutions as you want to be sure your visitor can see everything or at least the important navigation links:

35.	Browser Screen Resolution Checker - Markhorrell
36.	Screen Size Tester - AnyBrowser
37.	Screen Resolution Checker - AndyLangTon

HTML and CSS validations

Although it's not yet proved without doubt that W3C validation gives you better search engine rankings, it's sure that errors in your code can cause you big problems. Converting your website pages to XHTML will help you reach more customers, as your site will work better in more browsers and non-traditional devices. Read more about this topic in our article: Does your website need W3CF Validation

In order to see if you're CSS files or HTML code turns out to be valid use these tools:

• HTML

38.	W3C Validator
39.	WDG HTML Validator - Web Design Group
40.	CSE HTML Validator Lite
41.	Validation Services for your HTML / XHTML / WML - Validome

• CSS

42.	CSS Validator - Jigsaw

FireFox Extensions

43.	Developer ToolBar

A toolbar designed for Firefox, Flock, Mozilla and Seamonkey, with various web developer tools. 

44.

SEOpen

SEOpen is an extension for Firefox to help with search engine optimization. It provides many helpful tools at the click of a mouse: Yahoo Backlinks, Pages in Yahoo Index, Google Backlinks, Google Cache, and Pages in Google index, Google Related, PageRank Check, MSN Backlinks, Pages in MSN Index, Alexa Overview, Alexa Traffic, Alexa Related.

45.	SEO Links Extension

When enabled, SEO Links extension, hovering any link in FireFox (compatible width FireFox 1.0-1.5 ) will show you Yahoo, MSN, and Google link popularity and ranking data for the URL and anchor text pair.

Speed Tester

It's important to consider how fast your pages load because users will shy away from sites they can't navigate quickly and easily. Additionally, smaller pages are indexed by Google and other search engines easier:

46.	Speed Tester - LinkVendor
47.	Website Speed Test - Web Hosting Top
48.	Website Speed Test - Iwebtool
49.	Speed test - WebSite Goodies
50.	Web Page Speed Report

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