HTML Entity Encoder/Decoder

What are HTML Entities?

HTML entities are special character codes used to display reserved HTML characters or characters that are difficult to type on a keyboard. When browsers parse HTML, certain characters like angle brackets (< and >) and ampersands (&) have special meaning as markup syntax. To display these characters as literal text rather than interpreting them as code, they must be encoded as entities. For example, &lt; represents the less-than sign, &gt; represents the greater-than sign, and &amp; represents the ampersand itself.

HTML entities come in two forms: named entities (like &lt;, &gt;, &amp;, &quot;) that have human-readable names, and numeric entities (like &#60;, &#x3C;) that reference characters by their Unicode code point. Both forms are essential for properly rendering special characters in HTML documents, especially when dealing with user-generated content, international text, or mathematical symbols.

When Should You Encode or Decode HTML Entities?

HTML encoding is critical for preventing Cross-Site Scripting (XSS) attacks. When displaying user input on a web page, any HTML characters must be encoded to prevent malicious scripts from executing. Content management systems, comment sections, and any feature that renders user text must encode entities before display. Additionally, HTML entities are needed when including special characters in HTML attributes, embedding text within JavaScript strings, or ensuring correct rendering across different character encodings.

Decoding HTML entities is useful when extracting text from HTML documents, processing web scraping results, or debugging rendered content. If you see literal &lt; or &gt; appearing in your text instead of the actual characters, the content has been double-encoded and needs to be decoded.

How It Works

The encoder scans input text for characters that need encoding (<, >, &, ", ') and replaces them with their corresponding HTML entity codes. The decoder reverses this process by identifying entity patterns (named entities starting with & and ending with ;, or numeric entities with &# or &#x) and replacing them with the corresponding Unicode characters. The tool handles both named and numeric entities, supporting the full HTML5 entity set.

Tips for Best Results

Always encode user input before inserting it into HTML, even if the content appears safe. Never trust that users will only input plain text. For numeric entities, prefer decimal format (&#60;) for readability, or hexadecimal (&#x3C;) for compatibility with legacy systems. When decoding, be aware of double-encoding — some systems encode entities twice, requiring two passes to recover the original text.