The forum owner has given me permission to post about this tool to help with HTML validation.

It's always a good idea to validate/check HTML documents. Here are some reasons:

    *  If you want your site listed on search engines (and who doesn't?) then make sure that you have good HTML. Many engines cannot properly catalog or index a site that has serious HTML errors. This can greatly reduce the amount of traffic your web site receives from search engines.
    * Properly written HTML will render better, render on more browsers, and render faster than HTML with errors. It's also more easily adapted to print and alternative browsing devices like mobile phones and handheld computers.
    * Properly written HTML is more likely to be "future-proof" (backward compatible with future standards and future web browsers).
    * Broken links can quickly drive visitors away. How many times have you been annoyed when you found a broken link?
    * Problems such as "ugly" pages caused by poor HTML constantly drive visitors away from web sites. Do you want your web site to be one that customers will leave because of poor quality?
    * If you think that your HTML is good the way it is and that you don't need to check it (as many people think), then let a validator check your HTML to prove that you're right. Chances are that you'll be surprised and that your HTML has room for improvement.
    * Browsers are becoming more standards compliant, and it is becoming increasingly necessary and important to write valid and standards compliant HTML.
    * A WYSIWYG editor is no excuse for not producing good HTML. If a WYSIWYG editor does not produce good HTML, then it should not be used or its output should be fixed manually. Newer WYSIWYG editors are better but many still have problems writing correct HTML.
    * Having a site with dynamic pages is also no excuse for bad HTML. If the dynamic pages are outputting HTML that is full of errors, then the pages should be fixed.
    * Writing error-free HTML is the best way to help ensure that pages render optimally in as many browsers as possible. This includes older browsers and browsers that are yet to be developed.
    * Write it right the first time and write it once. Write it wrong, and you may be writing it again later.

A tool for checking HTML, CSS, links, SEO, accessibility and more is CSE HTML Validator (for Windows):
http://www.htmlvalidator.com/

There's a free lite edition too:
http://www.freehtmlvalidator.com/

And an online version based on the lite edition:
http://www.onlinewebcheck.com/

There are other offline and online validation and checking tools as well.

By the way, until August 1, 2010, CSE HTML Validator Professional v10 BETA is FREE with no limitations:
http://www.htmlvalidator.com/beta

Normally you are directly find html error but now HTML Validator Tool are also avalaible at online. w3c.org is best site for HTML Validator Tool.

This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc. If you wish to validate specific content such as RSS/Atom feeds or CSS stylesheets, MobileOK content, or to find broken links, there are other validators and tools available.

A validator is a software program that can check your web pages against the web standards.

When using a validator to check HTML, XHTML or CSS documents, the validator returns a list of errors found, according to your chosen standard.To be exact, there is no such thing as "HTML validation". The concept of validation that matters here is SGML or XML validation.

If you use a validation feature that's included with an HTML editor or other program, then you should try CSE HTML Validator! CSE HTML Validator's specialty is HTML validation and XHTML validation, doing it thoroughly and being more helpful than validators that are just thrown-in as just another feature. CSE HTML Validator also has many benefits and features that you won't find elsewhere.To help clarify accessibility issues a new category of problem called 'Probable Errors' has been introduced. This covers those problems which may not be an error in some circumstances.

HTML validator is very goodtools for SEo friendly site

I would like to thank you for letting me know about it.

Great efforts! Great post. Thanks for sharing. Hope to hear from you soon. 

Quote from: Albert Wiersch on March 24, 2010, 02:45:35 PM
The forum owner has given me permission to post about this tool to help with HTML validation.

It's always a good idea to validate/check HTML documents. Here are some reasons:

    *  If you want your site listed on search engines (and who doesn't?) then make sure that you have good HTML. Many engines cannot properly catalog or index a site that has serious HTML errors. This can greatly reduce the amount of traffic your web site receives from search engines.
    * Properly written HTML will render better, render on more browsers, and render faster than HTML with errors. It's also more easily adapted to print and alternative browsing devices like mobile phones and handheld computers.
    * Properly written HTML is more likely to be "future-proof" (backward compatible with future standards and future web browsers).
    * Broken links can quickly drive visitors away. How many times have you been annoyed when you found a broken link?
    * Problems such as "ugly" pages caused by poor HTML constantly drive visitors away from web sites. Do you want your web site to be one that customers will leave because of poor quality?
    * If you think that your HTML is good the way it is and that you don't need to check it (as many people think), then let a validator check your HTML to prove that you're right. Chances are that you'll be surprised and that your HTML has room for improvement.
    * Browsers are becoming more standards compliant, and it is becoming increasingly necessary and important to write valid and standards compliant HTML.
    * A WYSIWYG editor is no excuse for not producing good HTML. If a WYSIWYG editor does not produce good HTML, then it should not be used or its output should be fixed manually. Newer WYSIWYG editors are better but many still have problems writing correct HTML.
    * Having a site with dynamic pages is also no excuse for bad HTML. If the dynamic pages are outputting HTML that is full of errors, then the pages should be fixed.
    * Writing error-free HTML is the best way to help ensure that pages render optimally in as many browsers as possible. This includes older browsers and browsers that are yet to be developed.
    * Write it right the first time and write it once. Write it wrong, and you may be writing it again later.

A tool for checking HTML, CSS, links, SEO, accessibility and more is CSE HTML Validator (for Windows):
http://www.htmlvalidator.com/

There's a free lite edition too:
http://www.freehtmlvalidator.com/

And an online version based on the lite edition:
http://www.onlinewebcheck.com/

There are other offline and online validation and checking tools as well.

By the way, until August 1, 2010, CSE HTML Validator Professional v10 BETA is FREE with no limitations:
http://www.htmlvalidator.com/beta

You did a fabulous job with your post. Thanks for updating me with such an amazing work. Truly commendable.

Best option is http://validator.w3.org/

An HTML validator is a quality assurance program used to check Hypertext Markup Language markup elements for syntax errors. HTML validator is a good tool for search engine optimization.

To update the original post, CSE HTML Validator is now CSS HTML Validator for Windows.

Note that CSS HTML Validator for Windows also checks more than just HTML. It checks CSS, links, accessibility, spelling, SEO, and more.

Because CSS HTML Validator runs on Windows, it's blazing fast, super configurable, and protects your privacy because it doesn't upload documents to somewhere else in order to validate them.

The website URL is now:
https://www.htmlvalidator.com/

Direct download for the latest trial version (for Windows):
https://www.htmlvalidator.com/css-html-validator-trial-setup.exe

Here's a direct download to an older version that is free for personal and educational use:
https://www.htmlvalidator.com/cse-html-validator-160405personal-setup.exe

Quote from: Albert Wiersch on May 16, 2018, 09:30:52 AM
To update the original post, CSE HTML Validator is now CSS HTML Validator for Windows.

Note that CSS HTML Validator for Windows also checks more than just HTML. It checks CSS, links, accessibility, spelling, SEO, and more.

Because CSS HTML Validator runs on Windows, it's blazing fast, super configurable, and protects your privacy because it doesn't upload documents to somewhere else in order to validate them.

The website URL is now:
https://www.htmlvalidator.com/

Direct download for the latest trial version (for Windows):
https://www.htmlvalidator.com/css-html-validator-trial-setup.exe

Here's a direct download to an older version that is free for personal and educational use:
https://www.htmlvalidator.com/cse-html-validator-160405personal-setup.exe

Hi Albert - great to have you check in - hope all is well

Quote from: Webhelpforums on May 18, 2018, 12:21:02 AM
Hi Albert - great to have you check in - hope all is well

Thanks! It's been a while. Hope all is well over there too.