HTML Encoder, Decoder & Viewer

Securing Web Applications with Proper HTML Entity Encoding

Rendering untrusted user input directly into HTML without escaping creates catastrophic Cross-Site Scripting (XSS) vulnerabilities, allowing malicious actors to execute unauthorized scripts in user sessions.

HTML entity encoding neutralizes reserved markup characters like < and > by translating them into safe character entity references (like &lt; and &gt;), ensuring browsers render them as plain text rather than executable markup.

How to Use

1. Paste your raw text or HTML markup into the input editor.
2. Click "Encode HTML" to convert special characters into named entities.
3. Click "Decode HTML" to convert entities back into standard characters.
4. Copy the sanitized output directly into your application codebase.

Key Features & Capabilities

• Encodes all 5 critical XML/HTML entities (&, <, >, ", and ').
• Supports named entities, decimal numeric entities, and hex entities.
• Provides a live preview of how the browser renders the escaped text.
• 100% private in-browser sanitization.

Common Developer Workflows

• Sanitizing user inputs before displaying them in server-rendered templates.
• Displaying code snippets and HTML examples inside documentation pages.
• Debugging email template variables and RSS feed payloads.
• Preventing stored and reflected XSS security vulnerabilities.

Frequently Asked Questions