The HTML Entity Encoder & Decoder is a crucial tool for web developers and content creators. HTML entities are used to display reserved characters (like `<`, `>`, `&`) or special characters that might not be available on a standard keyboard. This tool allows you to easily encode plain text into its HTML entity equivalent, which prevents the browser from interpreting it as HTML code. Conversely, you can decode HTML entities back into their original characters to read or edit them.

To Encode Text to HTML Entities:

1. Select the "Encode" tab.
2. Type or paste your plain text (e.g., `
   Hello
   `) into the left-hand textarea.
3. Click the "Encode" button.
4. The text will be converted into HTML entities (e.g., `<div>Hello</div>`) in the right-hand textarea, ready to be safely displayed on a web page.

To Decode HTML Entities to Text:

1. Select the "Decode" tab.
2. Paste your HTML entity string into the left-hand textarea.
3. Click the "Decode" button.
4. The entities will be converted back to their original characters in the right-hand textarea.