HTML Encoder / Decoder

About HTML Encoder & Decoder

The HTML Encoder & Decoder converts special characters to their HTML entity equivalents and vice versa. This is essential for safely displaying user-generated content in HTML pages, preventing XSS (Cross-Site Scripting) attacks, working with HTML entities in web development, and preparing content for CMS platforms or email templates.

Why HTML Encoding Is Critical for Security

HTML encoding is the first line of defense against XSS attacks — one of the most common web security vulnerabilities. When user input containing characters like <, >, or " is rendered in HTML without encoding, an attacker can inject malicious JavaScript that executes in other users' browsers. Encoding these characters as <, >, and " ensures browsers display them as text rather than interpreting them as HTML markup. Every web application that renders user input must encode it properly.

Key Features

• HTML encode — converts characters like <, >, &, ", ' to their HTML entity equivalents.
• HTML decode — converts HTML entities back to their original characters for readable, editable text.
• Named entities — handles named entities like &, <, >,  , ©.
• Numeric entities — supports decimal (&) and hexadecimal (&) numeric character references.
• Sample data — load example HTML to quickly see the encoding and decoding in action.
• Instant processing — encode or decode text with one click, with results ready to copy.

How to Use

1. Enter text — paste text or HTML containing special characters into the input area.
2. Select mode — choose Encode to convert characters to entities, or Decode to convert entities back to characters.
3. Process — click the action button to encode or decode instantly.
4. Copy result — copy the output for use in your HTML pages, templates, or code.

Characters That Must Be Encoded

• < → < — prevents interpretation as HTML tag opening.
• > → > — prevents interpretation as HTML tag closing.
• & → & — prevents interpretation as entity start character.
• " → " — prevents breaking out of HTML attribute values.
• ' → ' — prevents breaking out of single-quoted attributes.

Real-World Use Cases

• Encoding user input before displaying it in HTML to prevent XSS (cross-site scripting) security vulnerabilities.
• Decoding HTML entities from API responses, scraped web content, or RSS feed descriptions.
• Preparing code snippets with angle brackets for display in HTML <pre> or <code> blocks.
• Converting special characters in email templates to HTML entities for cross-client compatibility.
• Encoding content for CMS platforms that require entity-encoded input in custom fields.