HTML Entity Converter
Convert text characters and symbols between named HTML entities, decimal references, and hexadecimal codes.
Quick Answer & Understanding Your Result
An HTML Entity Converter translates special characters into standardized W3C HTML entities (Named `&name;`, Decimal `&#NNN;`, Hexadecimal `&#xHHH;`) and decodes encoded markup back to plain text, preventing Cross-Site Scripting (XSS) and layout corruption.
The 3 Standard HTML Entity Formats
- Named Entities (`&name;`): Human-readable character aliases (e.g.
<,>,&,",©,€). - Decimal Numeric References (`&#NNN;`): Base-10 Unicode code points (e.g.
<,>,&,©,€). - Hexadecimal Numeric References (`&#xHHH;`): Base-16 Unicode code points (e.g.
<,>,&,©,€).
Web Security & Cross-Browser Publishing
- XSS Attack Prevention: Sanitizing user input by escaping
<script>andonerrorpayload delimiters. - Typography & Font Integrity: Guaranteeing special typographic symbols render identically on all browsers and email clients.
Enter your HTML markup or raw text above to encode, decode, or sanitize entity references with 0ms latency.
Formula & Calculation Logic
Technical Specification & ASTTranslates characters into W3C HTML5 entity references or parses numeric decimal and hex code points back into UTF-8 characters.
Step-by-Step Guide
Enter HTML Markup or Text
Paste raw code (e.g., <div>Hello & Welcome</div>) or entity strings (e.g., <div>).
Choose Operation Mode
Select Named Entities (<), Decimal Entities (<), Hex Entities (<), or Decode.
Select Encoding Scope
Choose whether to encode special characters only (< > & " ' /), non-ASCII characters, or all characters.
1-Click Copy & Inspect Diagnostics
Copy the sanitized code and review byte count, size delta, and XSS safety status.
Worked Examples Table
| Example | Input Values | Calculated Result | Explanation |
|---|---|---|---|
| Escape Script Tag for XSS Safety | Safely renders on page without triggering browser script execution. | ||
| Decode Entities to Clean HTML | Decodes named HTML tags and currency/copyright symbols back to raw HTML. |
Frequently Asked Questions
Evidence-Based Methodology & Authoritative References
W3C HTML5 Specification - Character Entity References
OWASP Cross-Site Scripting (XSS) Prevention Cheat Sheet
MDN Web Docs - Entity Reference in HTML
Standard: ISO / W3C / IETF Authoritative Domain Standard
Formula: Named Format = "&" + EntityName + ";"
Last Reviewed: August 21, 2026
Primary Source: W3C HTML5 Specification - Character Entity References
Reference Document: OWASP Cross-Site Scripting (XSS) Prevention Cheat Sheet
Computation Privacy: 100% client-side 0ms computation, zero data retention
All algorithms, formatters, and data conversions run 100% locally in your browser following official technical standards (RFC, ISO, W3C). Output should be verified prior to mission-critical production deployment.
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Calculated results are modeled based on standard scientific and mathematical formulas. Please verify with domain-specific technical documentation for specialized applications.