Ultimate HTML Encoder
Professional HTML entity encoder with multiple formats, visual diff, entity reference, and advanced features
The Ultimate HTML Encoder is a professional-grade tool that handles all your HTML entity encoding and decoding needs. It supports six different encoding formats: named entities (<), decimal numeric entities (<), hexadecimal entities (<), Unicode escape sequences (\u003C), URL encoding, and Base64 encoding. Each format serves different use cases - named entities for HTML readability, numeric for universal compatibility, Unicode for JavaScript strings, URL encoding for query parameters, and Base64 for data transmission.
Advanced features include selective encoding (encode only special characters or all characters), whitespace preservation (convert spaces to and newlines to <br>), and a visual diff view that highlights exactly what changed during encoding. The entity reference table provides instant access to common HTML entities with all their encoding formats, complete with descriptions and one-click insertion. Statistics show character counts, entity counts, and size ratios to help you understand the impact of encoding.
Whether you're escaping user input for security, preparing content for HTML display, debugging entity issues, or learning about character encoding, this tool provides everything you need. The swap input/output feature makes it easy to chain operations, and all processing happens locally in your browser for complete privacy. Perfect for web developers, content creators, and anyone working with HTML entities.
Six Encoding Formats
Named entities, decimal, hex, Unicode escapes, URL encoding, and Base64 - all in one tool.
Visual Diff View
See exactly what changed with color-coded highlighting for added, removed, and unchanged text.
Entity Reference Table
Searchable table of common entities with all formats, descriptions, and one-click insertion.
Selective Encoding
Choose to encode only special characters or all characters based on your needs.
Whitespace Preservation
Convert spaces to and newlines to <br> to preserve formatting in HTML.
Statistics Dashboard
See character counts, entity counts, special characters, and size ratios at a glance.
Bidirectional Conversion
Encode plain text to entities or decode entities back to plain text with one click.
Swap Input/Output
Instantly swap input and output to chain operations or reverse the conversion.
URL & Base64 Support
Encode/decode URL parameters and Base64 data alongside HTML entities.
Copy & Download
Copy output to clipboard or download as a text file for use in your projects.
Real-Time Conversion
See results instantly as you type with automatic encoding/decoding.
Privacy First
All processing happens in your browser - your data never leaves your device.