HTMLエンティティエンコーダー / デコーダー

特殊文字をHTMLエンティティにエンコード、またはデコード。無料で登録不要。

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About HTML Entities

HTML entities are special codes used to display reserved characters in HTML. Characters like <, >, &, and \" must be encoded to prevent them from being interpreted as HTML markup. This is crucial for preventing XSS attacks and displaying code snippets.

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\Escape / Unescape %20URLエンコーダー/デコーダー JSXHTML → JSX %%Percent Encoding Tool

How to Use

Enter HTML text or entities in the input field
Click 'Encode' to convert special characters to HTML entities
Click 'Decode' to convert HTML entities back to readable text
Copy the result

Common Use Cases

Preventing XSS attacks by escaping user input
Displaying code snippets in HTML pages
Working with special characters in web content
Email template development

Frequently Asked Questions

What are HTML entities?

HTML entities are special codes that represent characters that have meaning in HTML (like <, >, &) or characters not available on a standard keyboard.

When should I encode HTML entities?

Encode when displaying user input in HTML to prevent XSS attacks, or when you need to display special characters like ©, ™, or mathematical symbols.

Does this handle all special characters?

Yes. This tool handles all standard HTML entities including named entities (&), decimal (&), and hexadecimal (&) formats.