Unlike many other HTML checkers, CSE HTML Validator features an unusually powerful custom syntax checking engine that is specifically designed to check HTML, XHTML, and CSS. More information...

CSE HTML Validator Enterprise is the most powerful edition available. It includes the Batch Wizard with extended capacity for larger jobs, the Configuration Editor, a full year of priority support and maintenance (PS&M) (not just our basic support), and more. The differences among the enterprise, professional and standard edition are listed in the following table.

CSE HTML Validator Helps You Fix Your HTML
Checks/validates an entire website (or part of it) given one URL or folder with the Batch Wizard (Pro+)
Checks/validates a specified list of documents with the Batch Wizard (Pro+)
Finds misspelled and invalid tag names, tag attributes, tag attribute values, and character entities
Finds missing and mismatched quotation marks
Finds missing or extra end tags
Checks for accessibility issues based on Section 508 US Government Standards and/or the industry standard Web Content Accessibility Guidelines 1.0 (WCAG 1.0) or 2.0 (WCAG 2.0) (Std+)
Checks CSS syntax (Std+)
Checks the HTML and CSS output of dynamic pages (such as ASP and PHP pages) as you browse a website in the integrated web browser
Checks for issues that can affect search engine rankings (Std+)
Makes suggestions and gives tips to improve search engine rankings (Std+)
Detects incorrect placing and nesting of tags
Alerts you to incorrect or incompatible HTML based on a specific browser or HTML version (for example, notifies you of many Netscape specific or Internet Explorer specific tags, attributes, and attribute values)
Finds deprecated tags, attributes, and CSS (Std+)
Finds bad design issues and suggests improvements (Std+)
Finds broken links (Std/Pro)
Finds misspelled words

When HTML Validator finds problems, you can fix them easily with the integrated HTML/Text editor. Also see the comparison chart.

Benefits Of Using CSE HTML Validator
CSE HTML Validator helps you produce top quality websites. Remember, if a visitor has a problem with your website, then the next site is only a click away. If you have a business website, then CSE HTML Validator is a no-brainer; you'll quickly find it indispensable (and your customers will appreciate it too).
Are you wondering why your site is doing poorly on the search engines? Bad HTML may be the cause. Search engines may encounter great difficulty crawling, indexing, and extracting the content of a website that contains severely broken HTML. CSE HTML Validator will help you avoid bad HTML that can harm your position on search engines.
Using CSE HTML Validator to produce a quality website can build customer loyalty, improve brand equity, protect your corporate image, and increase revenue.
Requiring HTML developers to check their HTML with CSE HTML Validator before publishing or submitting it to a site will promote quality and save time and money. It will also greatly reduce the chance that a document has to be sent back to the developer for repair.
Even when using a WYSIWYG editor, don't assume that it knows how to write good HTML! The fact is that most of these programs generate very poor HTML. When using a WYSIWYG editor, be sure to check the documents that it generates before publishing them on the web. You may be surprised at some of the nonsensical things these programs will do. Don't take chances.
Save hours of time. The more HTML you write, the more time you will save. Don't waste time manually looking for problems, figuring out why your HTML doesn't display like it should, or using online checkers. Get CSE HTML Validator and check HTML, XHTML, and CSS fast. Remember: Time is money. Wouldn't you rather be doing something more productive than manually checking all those tags, attributes, properties, links, and more?
You'll be able to prevent many viewing problems before they happen. You won't have to wait until one of your visitors tells you about it. How many people are leaving your website because it's not displaying properly on their screen or not compatible with their web browser? Too many if you aren't using CSE HTML Validator.
Are you learning HTML? CSE HTML Validator offers you helpful advice and points out mistakes. There's no better tool to help you learn HTML than CSE HTML Validator.
Are you a computer or Internet consultant? Use CSE HTML Validator to show your clients how poor their website is and increase your business by helping them fix their website!
Your HTML writing standards will be superior to many HTML authors who still do not realize the importance of checking their web documents for problems.
Protect your reputation: If anyone looks at your HTML, then you'll have much more confidence in what they see. They'll know that you know what you're doing and that you care about giving a good impression with your website.
Do you still think that you don't need it? Do you think that you have a program that generates clean HTML? Give CSE HTML Validator a try for free. We bet you'll be surprised!

CSE HTML Validator also includes tools that change HTML tags and attributes to uppercase or lowercase, a tool that strips HTML tags, a tool that converts different operating system text file formats to other text file formats, and a tool that lets you use templates in your documents.

What's New in This Release:
Validator: Major update to HTML Tidy with improved HTML5 support (including the "picture" element)
Validator: Major update to JSLint for javascript linting
Link Checker: New option in the Link Checking tab of the Validator Engine Options to treat temporary redirects as OK (defaults to enabled)
Batch Wizard: New event function: onLinkReportAdding()
Batch Wizard: New Advanced tab with an option to disable media type checking
Improved visual quality on high DPI systems; CSE HTML Validator is now "DPI-aware"
Fixed a bug that could cause a program freeze when using path mappings
Other updates, improvements, and bug fixes throughout