Free Developer Tool
HTML Encoder & Decoder
Encode and decode HTML entities online. Convert special characters like <, >, & to their HTML entity equivalents or decode entities back to readable text. 100% client-side processing - your data never leaves your browser.
Quick Usage Guide
Named vs Numeric Entities
By default, common characters use named entities like <. Enable Numeric to use < format instead.
Encode All Characters
Enable this to convert every character to its numeric entity, useful for obfuscating text or ensuring maximum compatibility.
HTML Encoding 101
What is HTML Encoding?
HTML encoding converts special characters into HTML entities so they display correctly
in web pages without being interpreted as HTML markup. For example, <
becomes <.
XSS Prevention
Proper HTML encoding is essential for preventing Cross-Site Scripting (XSS) attacks. By encoding user input before displaying it, you prevent malicious scripts from being executed in browsers.
Named vs Numeric Entities
Named entities like & are readable but limited to common characters.
Numeric entities like & can represent any Unicode character
and are more universally supported.
Common Mistakes
Double-encoding (encoding already encoded text) can break your output. Always decode before re-encoding. Also, remember that encoding is context-dependent - HTML attributes may need different handling than HTML content.
Common HTML Entities
| Character | Named Entity | Numeric Entity | Description |
|---|---|---|---|
| < | < | < | Less than (opens tags) |
| > | > | > | Greater than (closes tags) |
| & | & | & | Ampersand (starts entities) |
| " | " | " | Double quote (attribute values) |
| ' | ' | ' | Single quote / apostrophe |
| |   | Non-breaking space | |
| © | © | © | Copyright symbol |
Common Use Cases
Display Code Snippets
When showing HTML code examples on a webpage, encode the tags so they display as text instead of being rendered as actual HTML elements.
Sanitize User Input
Encode user-submitted content before displaying it to prevent XSS attacks and ensure malicious scripts cannot execute in visitors' browsers.
Email Templates
Encode special characters in HTML email templates to ensure consistent rendering across different email clients and platforms.
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