Percent Sign %

The Percent Sign character (%) is a standard HTML entity defined in the HTML specification. In HTML source code, it can be written using the named entity reference %, the decimal numeric character reference %, or the hexadecimal numeric reference %. The character is assigned Unicode code point U+0025 in the Universal Character Set.

The percent sign represents a proportion as parts per hundred. Beyond its mathematical use, it serves as the escape character in URL encoding (percent encoding, where %20 represents a space) and as the modulo operator in many programming languages. It is fundamental to both everyday content and technical web development.

Technical character entities represent brackets, delimiters, and punctuation marks that frequently require escaping in HTML source code and programming contexts. Characters like curly braces, square brackets, pipes, and backslashes often carry special meaning in templating engines, regular expressions, or markup parsers, making their explicit HTML entity encoding important for preventing unintended interpretation by the browser or build tools.

When deciding how to encode the Percent Sign character in your HTML documents, the named entity % is generally the most readable choice for developers reviewing or maintaining source code. The decimal form % and hexadecimal form % are equally valid alternatives that work in contexts where named entities may not be supported, or when generating HTML output programmatically from server-side code. All three representations produce identical visual output in every modern web browser.

Use the percent sign entity when discussing URL encoding in technical documentation (where %XX sequences have special meaning) or when the character might be misinterpreted in generated URLs. In standard HTML text, the percent sign can usually be typed directly.