About HTML Encoder / Decoder
HTML encoding (also called HTML escaping) replaces special characters with their corresponding HTML entity codes. For example, < becomes <, > becomes >, & becomes &, and quotes become " or '. This conversion is essential for displaying these characters as literal text in HTML rather than having the browser interpret them as markup. Without proper encoding, user-submitted content containing angle brackets or ampersands could break page layout or introduce XSS security vulnerabilities. Decoding reverses the process, converting HTML entities back to their original characters. This tool handles both named entities (like &) and numeric entities (like <). All processing runs entirely in your browser. For related tools, see our URL Encoder and HTML Tag Remover.
How to Use HTML Encoder / Decoder
- Paste or type your text in the Input area.
- Select Encode to convert special characters to HTML entities, or Decode to convert entities back to characters.
- View the result in the output area.
- Click Copy result to copy the encoded or decoded text to your clipboard.
Key Features
- Bidirectional conversion — Encode characters to entities or decode entities back to characters.
- Comprehensive entity support — Handles named entities (
&,<), decimal numeric entities (<), and hexadecimal entities (<). - XSS prevention — Properly encodes user input to prevent cross-site scripting vulnerabilities.
- One-click copy — Instantly copy the result to your clipboard for use in your code or documents.
- Browser-based privacy — All encoding and decoding runs client-side with no server interaction.
- Instant processing — Results appear immediately, even for large blocks of text.
When to Use This Tool
- Preparing code snippets or HTML examples for display in documentation or tutorials.
- Sanitizing user-generated content before embedding it in HTML to prevent XSS attacks.
- Debugging rendering issues caused by unescaped special characters in HTML templates.
- Converting HTML entities in exported data back to readable characters.
- Encoding special characters in email templates or CMS content that requires entity-safe text.
Technical Details
The encoder converts the five critical HTML characters: & (ampersand), < (less than), > (greater than), " (double quote), and ' (single quote/apostrophe). These are the characters that have special meaning in HTML syntax and must be escaped when displayed as literal text. The decoder uses the browser's built-in HTML parsing capabilities to resolve both named and numeric entities back to their Unicode characters. This approach ensures compatibility with the full range of HTML5 named entities. Note that encoding is not the same as sanitization — for full input sanitization in production applications, use a dedicated library like DOMPurify in addition to encoding.
Conclusion
The HTML Encoder / Decoder is a fundamental web development tool that ensures special characters are displayed safely and correctly in HTML. With browser-based processing and support for all major entity formats, it's an indispensable utility for preventing XSS vulnerabilities and handling HTML content with confidence.