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HTML Entity Converter

This HTML entity converter encodes and decodes HTML entities to prevent rendering errors and XSS vulnerabilities. Convert special characters like <, >, &, and Unicode symbols into safe entity references (&lt;, &copy;, &#8364;). Developers use it to sanitize user input, display code samples in documentation, and debug entity-encoded API responses. Supports named entities (&euro;) and decimal/hex numeric references (&#8364;). All processing happens client-side for instant results. Method details for HTML Entity Converter: Processing follows explicit developer-facing rules for api payload shape, json/yaml structure, schema validation, and when applicable regex, hash, and checksum behavior. It also handles edge cases such as mixed named and numeric references in the same string and preserves character order during round-trip conversion.

How to Use This Tool

  1. Choose Mode - Click Encode to convert text to HTML entities, or Decode to convert entities back to plain text
  2. Enter Text - Paste your content. In encode mode, check options to encode all characters or use decimal instead of named entities
  3. View Output - Results update instantly as you type. Encoding converts <script> to &lt;script&gt;, decoding reverses it
  4. Copy Result - Click Copy to grab the output for your HTML, documentation, or code

Why Use This Tool?

HTML entities are escaped sequences that represent characters with special meaning in HTML. < becomes &lt; (less-than), > becomes &gt; (greater-than), and & becomes &amp; (ampersand). Without encoding, <script>alert('XSS')</script> would execute as JavaScript. With encoding, it displays as harmless text. Named entities (&copy; for ©) are readable, while numeric entities (&#169;) work universally but are less semantic.

Developers encode user-generated content to prevent XSS attacks (cross-site scripting). If a comment field accepts <img src=x onerror=alert(1)> without encoding, attackers inject malicious scripts. Encoding breaks the HTML structure, rendering it safe. Decoding reverses this for editing or processing API data. Tutorials and documentation sites encode code examples so <div> displays literally instead of creating an element. Email templates use entities to ensure symbols render correctly across clients.

This tool maps common characters to named entities (75+ symbols including accented letters, currency, math operators) and falls back to decimal notation (&#N;) for everything else. The encode-all mode converts every character for maximum compatibility (useful for obscure Unicode). Decoding uses the browser's built-in parser (innerHTML to textContent) for standards compliance. Use the decimal option when targeting old systems that don't recognize named entities. This prevents rendering bugs in RSS feeds, XML, and legacy email clients.