What Is an HTML Entity? en español

An HTML entity (more precisely, a character reference) is a way to write a character using an escape sequence instead of the literal character itself. The most familiar form starts with & and ends with ;, such as < for < or © for ©.

Why HTML needs escaping

HTML uses < and > to delimit tags. If you insert raw <script> into a page without escaping, the browser may interpret it as markup. Escaping turns < into < so the browser displays the character instead of starting a tag.

The same idea applies to:

• Ampersands (&) — must be escaped first so © is not parsed incorrectly
• Quotes in attributes — " and ' inside attribute values
• Special symbols — ©, non-breaking spaces, math symbols in content

Entities are not encryption

Encoding does not hide meaning. Anyone can decode Tom & Jerry back to Tom & Jerry. The goal is safe insertion into HTML, not confidentiality.

Where developers see entities

Common sources include:

• CMS exports that escape HTML for storage or email templates
• Server-side template engines that auto-escape output
• JSON or log fields containing pre-escaped snippets
• Copy-paste from Word or rich-text editors with smart quotes and symbols

Decode vs render

Decoding an entity string produces text. Rendering that text inside HTML is a separate step. Never assume that decoding alone makes content safe for innerHTML.