HTML Entity Encoder

What is HTML Entity Encoder?

HTML Entity Encoder by Toolsiro converts special characters into their HTML entity equivalents — and decodes them back — directly in your browser. It handles encoding for safe HTML output, prevents XSS vulnerabilities, and includes a comprehensive reference table of common entities for quick insertion.

HTML entities are essential whenever you need to display characters that have special meaning in HTML, or when you need to safely embed user-generated content in a web page without risking rendering or security issues.

How to Encode and Decode HTML Entities

Paste or type your text in the input panel. Choose Encode mode to convert special characters like <, >, &, and " into their entity equivalents. Choose Decode mode to convert entities back to their original characters. The conversion happens in real time. Use the Swap button to quickly move output back to input for chained operations.

Why HTML Encoding Matters

When you display user-provided text in HTML without encoding it, characters like < and > can break your page structure or — more seriously — allow script injection. Encoding transforms <script> into <script>, which browsers display as plain text instead of executing. This is one of the fundamental defenses against Cross-Site Scripting (XSS) attacks.

Encode All Non-ASCII Characters

The optional "encode all non-ASCII" mode converts any character outside the basic ASCII range (code points above 127) into numeric HTML entities like é for é or € for €. This is useful when you need your HTML to be strictly ASCII-safe for environments that may not handle UTF-8 correctly, such as certain email clients or legacy systems.

Common Entities Reference

The reference grid at the bottom of the tool shows the most frequently used HTML entities. Click any entity to insert the corresponding character directly into the input field. The table covers essential HTML characters (&, <, >), typographic characters (em dash, ellipsis, non-breaking space), currency symbols (€, £, ¥), and mathematical symbols (±, ×, ÷).

Named vs Numeric Entities

HTML entities come in two forms. Named entities like © are human-readable and widely supported. Numeric entities like © (decimal) or © (hexadecimal) work for any Unicode character, even those without a named entity. This tool uses named entities where available and numeric entities for everything else.

Common Use Cases

Web developers encode user-submitted content before inserting it into HTML templates. Technical writers encode code samples for display in documentation. Email marketers encode special characters in HTML emails for compatibility across clients. Security engineers use encoding to sanitize output in web applications. Content editors encode typographic characters like em dashes and copyright symbols in CMS systems.