100% Client-Side

HTML Entity Encoder

Escape HTML special characters to prevent XSS and display issues

Free Client-Side No Login No Storage
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How to Use the HTML Entity Encoder

  1. Enter or paste HTML into the input field.
  2. Click Encode to escape special characters.

Converts &, <, >, ", and ' to their HTML entity equivalents. Essential for preventing XSS attacks and displaying code snippets safely in HTML pages.

What is HTML Entity Encoder?

HTML encoding converts special characters like <, >, &, and quotes into their HTML entity equivalents (< > &). This prevents XSS vulnerabilities and ensures special characters render correctly in browsers instead of being parsed as HTML tags.

Common Uses

  • Sanitizing user input before rendering in HTML
  • Preparing code snippets for blog posts
  • Fixing broken characters in email templates

Frequently Asked Questions

What is HTML Encoding?

HTML encoding converts special characters like <, >, &, and quotes into their HTML entity equivalents (< > &). This prevents XSS vulnerabilities and ensures special characters render correctly in browsers instead of being parsed as HTML tags.

Why use Aya Corporation's HTML Encoder?

Client-side only. Encode sensitive template strings, user-generated content, or code snippets without pasting them into an online service that logs inputs.

When to use this tool

Use when sanitizing user input before rendering in HTML, preparing code snippets for blog posts, or fixing broken characters in email templates.

Notes from this implementation

Stop the browser from treating text as markup

The encoder replaces characters that start markup or entities. The set that matters for text you will drop into HTML is &, <, >, and quotes. <script> becomes a string a browser shows as text instead of running.

Vector

<b>hi&you</b>
&lt;b&gt;hi&amp;you&lt;/b&gt;

Encoding is not a sanitizer for a place where HTML is allowed. If you encode and then a template decodes, or you put the result into an attribute that a framework interprets, you are back where you started. Encode at the last step, for the context you are in (body text is not the same as a JavaScript string inside a script tag).