HTML Entities: The Complete Reference Guide

If you've ever seen & in a webpage's source code and wondered what it means, you've encountered an HTML entity. HTML entities are special codes that represent characters which would otherwise be interpreted as HTML markup— or characters that don't exist on a standard keyboard.

This guide covers what they are, why they exist, the most common ones you'll use, and how to handle them in modern frameworks like React.

Why HTML Entities Exist

HTML uses certain characters as part of its syntax. The angle brackets < and > define tags. The ampersand & starts entity references. Quotes delimit attribute values.

So what happens when you want to display these characters in your content? If you write <div> in your HTML, the browser thinks you're opening a div tag. To show the literal text on the page, you need entities.

The 5 Essential HTML Entities

These are the entities you'll use 90% of the time. Memorize them:

Common Special Characters

Beyond the essential five, here are the entities you'll reach for most often:

Math & Technical Symbols

Numeric Character References

Every character in Unicode can be represented as a numeric entity using its code point:

HTML Entities in React / JSX

React/JSX handles entities a bit differently than plain HTML. Here's what works and what doesn't:

Security: Why Entities Matter for XSS Prevention

HTML entities aren't just about displaying special characters — they're a critical part of preventing Cross-Site Scripting (XSS) attacks. If user input is rendered as HTML without escaping, an attacker could inject malicious scripts.

Modern frameworks like React automatically escape JSX expressions, but if you render raw HTML strings, you must encode entities manually. Our HTML Entity Encoder makes it easy to encode and decode strings safely.

Quick Encoding/Decoding

Need to quickly encode or decode HTML entities? Here are your options:

Or skip the code and use our free HTML Entity Encoder/Decoder — paste your text, get the encoded output instantly.

Want to learn more web fundamentals? Read CSS Tricks AI Generates But Can't Explain, try our HTML Entity Encoder, or browse all our free developer tools.