HTMLエンコーダー・デコーダー
HTMLエンティティをオンラインでエンコード・デコードします。特殊文字をHTMLエンティティに変換し、その逆も行います。
エンコードするテキスト
機能紹介
The HTML Encoder & Decoder tool converts special characters to HTML entities and back. It helps you prevent XSS issues, display code snippets safely, and debug double-encoding bugs in web applications.
このツールを使うタイミング
Use this tool whenever you need to escape or unescape HTML: rendering user input safely, showing raw HTML in documentation, or inspecting how entities are stored in a database.
使い方
Choose encode or decode
Decide whether you want to turn raw text into HTML entities or convert existing entities back into normal characters.
Paste your text or HTML
Paste HTML markup, user input, or text containing entities such as & or < into the input area.
Run the conversion
Click the convert button to see either the encoded or decoded result in the output box.
Use the safe output
Copy the processed text into templates, CMS fields, or debugging tools to confirm it behaves correctly.
使用例
Displaying code samples on a blog
Encode HTML tags so they appear as text instead of being executed by the browser when embedded in articles.
Diagnosing double-encoding
Decode suspicious strings to see if they were accidentally encoded more than once when saving to or reading from a database.