Check Your Web Site

Use these tools to quickly check the pages of your site for valid markup, accessibility, usability, browser compatibility, spell checking, etc.

You may also want to review the Top Ten Web Design Mistakes and check out the Sherlock tool.

Xenocode Browser Sandbox

Test your site in the most popular browsers, running directly from the web. Now you can test your pages in all versions of Internet Explorer, Firefox, Opera, Safari, and Chrome without installing them.

Total Validator

An all-in-one validator comprising a HTML validator, an accessibility validator, a spelling validator, a broken links validator, and the ability to take screenshots with different browsers to see what your web pages look like.

Validation Options

Electrum SortSite

Scans the first 10 pages of a web site, testing for quality checkpoints, including accessibility, browser compatibility, broken links, and standards compliance.

Comprehensive launch pad for checking your page with over 20 tests, including validation, accessibility, performance, spelling, links, etc.

ZDNet's NetMechanic Toolbox

Finds broken links, spots bad HTML code, checks browser compatibility, finds slow-loading pages, and checks your spelling, all in one shot.

Pages:    This page only    First 5 pages

Truwex Online Tool

Check accessibility (WCAG and Section 508), privacy (including PII -- personally identifiable information), page quality (broken links, missing items), and interaction behavior.

Web Page Performance & Speed Analyzer

Calculates page size, composition, and download times, including the size of individual elements and web page components. Offers advice on how to improve page load times.


Pingdom: Detailed Load Time Analysis

Calculates and displays a numeric and graphical load time analysis of all internal and external page objects, including XHTML, RSS, XML, CSS, Scripts, Images, and Plugins.

W3C HTML/XHTML Validator

Checks your pages for correct HTML and XHTML markup.

Validate by URL

Options (Help):

Validate by File Upload

Options (Help):

W3C CSS Validator

Checks your pages for correct Cascading Style Sheet (CSS) markup.

Validate by URL

Warnings : Profile : Medium :

Validate by File Upload

Local file:  
Warnings : Profile : Medium :

W3C Link Checker

Check all the links on your site.



WAVE Accessibility Evaluation

Helps check your page for accessibility for people with disabilities.

Cynthia Says Accessibility Validation

Identifies errors in your content related to Section 508 standards and/or the WCAG guidelines.

EvalAccess 2.0 Accessibility Checker

Check a single page or entire site for conformance to WCAG 1.0.

Check Single Page

Check Entire Site

ATRC Accessibility Checker

Checks your page for accessibility issues against several accessibility guidelines. From the Adaptive Technology Resource Center (ATRC).

Guidelines to Check Against

Functional Accessibility Evaluator (University of Illinois at Urbana-Champaign)

Evaluates the functional accessibility of a single web page.

HERA Accessibility Tester (WCAG 1.0)

Checks a web page against the WCAG 1.0 specification.

Section 508 Accessibility Evaluation

Evaluates a web page against the Section 508 U.S. law standard.

Robots.txt Checker

Analyzes the syntax of your robots.txt file to see if its format is valid as specified by the Robot Exclusion Standard.


Mobile-Readiness Evaluation

Test the mobile-readiness of your site using industry best practices and standards.

Browser Screen Resolution Checker

Simulates your web page in different screen resolutions.

Screen Resolution:

Vischeck Page Simulator for Vision-Impaired Users

Select the type of color vision to simulate:

deutan hats Deuteranope (a form of red/green color deficit)
protan hats Protanope (another form of red/green color deficit)
tritan hats Tritanope (a blue/yellow deficit- very rare)


Select the type of color vision to simulate:

deutan hats Deuteranope (a form of red/green color deficit)
protan hats Protanope (another form of red/green color deficit)
tritan hats Tritanope (a blue/yellow deficit- very rare)

Image file: 

Colorblind Web Page Filter

AccessColor Contrast Analyzer

AccessColor tests the color contrast and color brightness between the foreground and background of all elements in the DOM to make sure that the contrast is high enough for people with visual impairments, based on W3C Guidelines.

Color Contrast Check

Determines if two colors provide sufficient contrast to pass the W3C Accessibility Guidelines and Section 508 requirements.

GrayBit Grayscale Page Simulator

Convert your full-color web page into a grayscale rendition in order to test the pageís perceived contrast for accessibility.

Search Engine Browser Simulator

See your website like a search engine sees it.


Link Popularity

Find out how many sites are linking to your site, and who they are.


Keyword Selector

Use the Google Keyword Tool to help you select the best keywords for the META tags on your pages. Better keywords = increased traffic.

Test the Readability of a Web Site

Provides content authors with an evaluation of the readability of their website and assists with Guideline 14 of the W3C Web Content Accessibility Guidelines (documents are clear and simple).

You can also copy and paste or enter the text you want to analyze:

Audit It URL Checker

Use this handy tool to check which major search engines have included your site in their index and how many pages are included in their index.


ZDNet's NetMechanic GIFBot

Optimizes GIF and JPEG images by up to 90% without loss of image quality.

What output image types would you like to see?
Same as input type
GIF Only
Both GIF and JPEG

Brown University's XML Validator

Validates XML documents locally or on the web.

 Suppress warning messages
 Relax namespace checks
 Suppress warning messages
 Relax namespace checks

XML & XML Schema Validator

Validates XML documents against an W3C XML Schema (XSD) or an XML Data-Reduced (XDR) schema, verifies the schemas are valid, or simply checks the well-formedness of XML documents.

Schema document:
XML document:

JSLint: The JavaScript Verifier

JSLint scans JavaScript source code, examining it for problems. If it finds a problem, it returns a message describing the problem and an approximate location within the code.