HTML Tidy is a computer program and a library whose purpose is to fix invalid HTML and give the source code a reasonable layout (aka indent style).

It was developed by Dave Raggett of W3C, then passed on to become a Sourceforge project. Its source code is written in ANSI C for maximum portability and precompiled binaries are available for a variety of platforms. It is available under the W3C license (a permissive, BSD-style license).

Examples of bad code it is able to fix:

• Missing or mismatched end tags, mixed up tags
• Adding missing items (some tags, quotes, ...)
• Reporting proprietary HTML extensions
• Change layout owing to predefined style
• Transform characters from some encodings into HTML entities
• Cleaning up presentational markup

See also

• HTML-Kit
• CSSTidy

External links

• HTML Tidy Project Page
• Clean up your Web pages with HTML TIDY
• HTML Tidy service an online version of the HTML checker (w3.org)
• Mozilla/Firefox extension for HTML validation based on Tidy

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