HTML Encoder Decoder
HTML Encoder Decoder converts special characters and non-ASCII text to their corresponding HTML entities and decodes HTML entities back to characters. This tool runs entirely in your browser, ensuring no data is uploaded or stored externally.
The HTML Encoder Decoder tool efficiently converts characters like <, >, &, ", and ', as well as all non-ASCII characters, into named or numeric HTML entities. It supports all 2,231 named HTML entities defined in the HTML specification, making it comprehensive for web developers and content creators. Running fully in-browser, your data remains private without any external transmission. This tool complements other utilities such as URL Encode and HTML to Markdown, providing a robust suite for handling web content encoding needs.
How to Use HTML Encoder Decoder
- Paste or type your text containing special or non-ASCII characters into the input area.
- Select the mode: Encode to convert characters into HTML entities, or Decode to revert entities back to their original characters.
- Click the Process button to perform the conversion instantly in your browser.
- Copy the resulting output for use in your HTML, CSS, or JavaScript projects.
How It Works
This tool uses the he library, a well-known JavaScript implementation for encoding and decoding HTML entities. In encode mode, it transforms characters such as <, >, &, ", ', and all characters outside the ASCII range into either named entities (e.g., &) or numeric references (e.g., >). The decoder reverses this process by parsing all 2,231 named entities defined in the HTML5 spec back to their Unicode characters. Processing occurs entirely within your browser's JavaScript engine, which means no data leaves your device, preserving your privacy.
Example
Input (Encode mode): <div class="example">Hello & welcome! — 50% off</div>
Output:
<div class="example">Hello & welcome! — 50% off</div>Input (Decode mode): <div class="example">Hello & welcome! — 50% off</div>
Output:
<div class="example">Hello & welcome! — 50% off</div>When to Use HTML Encoder Decoder
- As a developer, when embedding user-generated content in HTML to prevent injection attacks and ensure valid markup.
- For designers preparing HTML templates that include special characters or symbols not easily typed on a keyboard.
- SEO specialists sanitizing and encoding meta tag content to maintain proper HTML structure and avoid rendering issues.
- Students learning about HTML entities and character encoding, testing how different characters are represented.
- When you need to convert HTML output back to readable text for debugging or content migration.
This tool works well alongside URL Encode for encoding URLs and Base64 Encode for encoding binary data in web applications.
Frequently Asked Questions
What characters does the HTML Encoder Decoder convert?
The encoder converts reserved HTML characters such as <, >, &, ", ', plus all non-ASCII Unicode characters into named or numeric HTML entities. The decoder reverses all 2,231 named HTML entities back to their original characters.
Is my data uploaded when using this tool?
No, all encoding and decoding operations run entirely in your browser’s JavaScript engine. This means your input data never leaves your device, ensuring complete privacy and security.
Why use named entities versus numeric references?
Named entities like & are easier to read and maintain in HTML source code, while numeric references like > provide universal compatibility across character sets. This tool supports both methods depending on your preference or use case.
Can this tool handle all HTML5 entities?
Yes, the tool supports all 2,231 named HTML entities defined in the HTML5 specification, covering common symbols, special characters, and extended Unicode characters.
How is this tool useful for SEO specialists?
SEO specialists can use this tool to encode meta tag content and URLs properly, preventing HTML validation errors and ensuring search engines correctly interpret the page content.