Text Input

Enter plain text to encode or HTML entities to decode

Output

What is HTML Encoding?

HTML encoding converts special characters into HTML entities to prevent them from being interpreted as HTML markup. This is essential for displaying user-generated content safely and preventing Cross-Site Scripting (XSS) attacks. For example, < becomes < and & becomes &.

How to Use

Enter or paste text in the input field
Click "Encode to HTML" to convert special characters to entities
Click "Decode HTML" to convert entities back to characters
Copy the result using the "Copy Output" button

Encoding Example

Input:

<div class="example">Hello & Welcome!</div>

Encoded Output:

&lt;div class=&quot;example&quot;&gt;Hello &amp; Welcome!&lt;/div&gt;

Decoding Example

Input:

&copy; 2024 &mdash; All rights reserved &trade;

Decoded Output:

© 2024 — All rights reserved ™

Common Use Cases

Displaying user-generated content safely in HTML
Preventing XSS (Cross-Site Scripting) attacks
Showing code examples in HTML documents
Encoding special characters in XML and HTML attributes
Processing data from APIs that contain HTML entities
Creating safe HTML email content

Supported Entities

This tool supports both named entities (like &, <, ©) and numeric entities in decimal (<) or hexadecimal (<) format. Common entities include:

& - Ampersand (&)
< - Less than (<)
> - Greater than (>)
" - Double quote (")
' or ' - Single quote (')
  - Non-breaking space
© - Copyright symbol (©)
® - Registered trademark (®)
™ - Trademark (™)

Security Note

HTML encoding is a critical security measure for web applications. Always encode user input before displaying it in HTML to prevent XSS attacks. However, encoding alone is not sufficient for all contexts - use appropriate encoding for URLs, JavaScript, and CSS as well.

Frequently Asked Questions

What's the difference between HTML encoding and URL encoding?

HTML encoding converts characters to HTML entities (like <) for safe display in HTML documents. URL encoding converts characters to percent-encoded format (like %3C) for safe transmission in URLs. They serve different purposes and use different encoding schemes.

When should I use HTML encoding?

Use HTML encoding whenever you display user-generated content or dynamic data in HTML. This includes form inputs, comments, usernames, search results, and any content that might contain special characters. It's essential for preventing XSS attacks.

Does HTML encoding affect performance?

HTML encoding has minimal performance impact. Modern browsers handle entity decoding efficiently, and the encoding process itself is very fast. The security benefits far outweigh any negligible performance cost.

Can I encode emoji and Unicode characters?

Yes! This tool handles all Unicode characters correctly, including emoji. You can encode them as numeric entities if needed, though modern HTML5 supports UTF-8 encoding directly, so emoji usually don't need to be encoded unless you're working with legacy systems.

Is my data sent to a server?

No, all encoding and decoding happens in your browser. Your data never leaves your device, ensuring complete privacy and security.

What's the difference between ' and '?

Both represent the single quote character ('). ' is a named entity defined in XML but not in HTML4 (though HTML5 supports it). ' is the numeric entity that works in all HTML versions. This tool supports both formats.