The Complete Guide to HTML Entity Encoding: Preventing XSS & Escaping Special Characters

Overview

In HTML, certain characters are reserved by the parser for markup syntax (such as < and > for opening and closing tags). When raw text contains these symbols, the browser interprets them as HTML tags rather than text content.

HTML Entity Encoding replaces reserved and special characters with predefined character references, ensuring safe display and preventing Cross-Site Scripting (XSS) vulnerabilities.

Our HTML Entity Converter runs locally in your browser to instantly encode or decode HTML entities with zero data leakage.

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Why HTML Escaping is Critical for Web Security

Unsanitized user input rendered directly into the DOM is the leading cause of Cross-Site Scripting (XSS) attacks. For example, if a comment form accepts raw script tags, direct rendering allows an attacker to execute malicious scripts inside other users' sessions. When HTML-escaped, this string transforms into safe entities:

<script>alert(document.cookie)</script>

The browser displays the exact characters without interpreting or executing the code.

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Standard Named HTML Entities

| Raw Character | Named Entity | Decimal Entity | Hex Entity | Description |
|:---:|:---:|:---:|:---:|:---|
| & | & | & | & | Ampersand |
| < | < | < | < | Less-than sign |
| > | > | > | > | Greater-than sign |
| " | " | " | " | Double quotation mark |
| ' | ' | ' | ' | Apostrophe / Single quote |
| Space |   |   |   | Non-breaking space |
| © | © | © | © | Copyright symbol |
| ™ | ™ | ™ | ࡊ | Trademark symbol |

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Step-by-Step Instructions

Choose Mode: Toggle Encode (convert raw text to HTML entities) or Decode (convert entities back to plain text).

Input Text: Type or paste your HTML or code snippets into the input field.

Live Conversion: See the escaped or unescaped text generated instantly.

Copy: Click Copy Result to paste the sanitized text into your templates or documentation.