HTML Validators check HTML against the formal HTML specification published by the World Wide Web Consortium (W3C), giving an error report. HTML Lints check HTML for compatibility with different browsers and screen sizes, download times, spelling, and more. If you are only going to use one, use a validator. HTML which follows the HTML specification will be compatible with the widest audience. For compatibility with disabled users, check your documents against the W3C's Web Site Accessibility Guidelines.
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- SP Windows and Unix. Object-oriented toolkit for SGML parsing and entity management. Can validate any version of HTML for which a DTD is available. Free Software.
- HTML PowerTools Windows. Includes validator, image scanner, meta tag manager, find and replace tool, tag pair fixer, and an HTML to text converter. Commercial software; 30-day demo.
- Firefox extension HTML Validator A W3C Tidy-based HTML Validator which checks pages from within the Firefox web browser.
- CSE HTML Validator Windows. HTML, XHTML, and CSS validator. Also checks accessibility, links, and spelling. Commercial pro version and free lite version.
- HTML Tidy Unix, Windows, MacOS, and others. Validator fixes errors in HTML and XHTML. Converts HTML to XHTML. Free Software.
- A Real Validator Windows. Based on an SGML parser. Shareware.
- LinkScan/QuickCheck Unix and Windows. Lint and link checker. Commercial software; free trial. Also online checking.
- Demoroniser Perl script which corrects incompatible HTML generated by Microsoft applications.
- SP Instructions Windows. Instructions for the Do-it-yourself Offline HTML Validator using SP.
- SWAN: SubWeb Analyzer Unix. Generates statistics and finds inconsistencies in a subweb (web site).
- HTML Shrinker Windows. Removes unnecessary characters from HTML, CSS, Perl, JavaScript and many other web file formats. Commercial pro version and free light version.
- Illumit L.L.C.: WebLight Linux, Mac OS X, and Windows. Finds broken links, non-standard HTML, and links between URIs on web sites. Commercial software; free for small sites.