How to Use the HTML Escape and Unescape Tool

1. Paste your code: Enter raw HTML or escaped entity strings into the Input Data box.
2. Select operation:
   • Click Escape HTML to convert reserved characters (<, >, &, ", ') into entities.
   • Click Unescape HTML to decode existing entities back into standard markup tags.
3. Copy the result: Click Copy to instantly transfer the clean output to your clipboard.

Note: This tool processes everything entirely inside your web browser (client-side). No code or sensitive data is ever sent to an external server.

Why Is HTML Escaping Critical for Web Development?

HTML uses reserved characters to parse document structure. When these characters appear inside user-submitted content or source-code snippets, browsers cannot differentiate between data and actual page markup.

Escaping resolves this problem across three core areas:

1. Cross-Site Scripting (XSS) Prevention

When rendering user inputs (such as comments, profile bios, or form inputs), an unescaped string like <script>stealData()</script> will execute directly in the visitor’s browser. Escaping it into <script>stealData()</script> renders the script visibly as plain text without executing malicious code.

2. Displaying Code Snippets in Documentation

To showcase HTML examples inside <pre> and <code> blocks on blogs, technical documentation, or tutorials, the opening and closing brackets must be escaped. Failing to escape them causes the browser to parse them as DOM elements, breaking your site layout.

3. Preserving Form Inputs and Attributes

When rendering dynamic values inside HTML attributes (such as <input value="your_value">), unescaped quotation marks (" or ') break out of the attribute container, opening attribute-based injection vulnerabilities.

Reserved HTML Characters & Entity Conversion Table

The standard 5 characters responsible for HTML structural parsing and their equivalent entity representations:

Character	Character Name	Escaped Named Entity	Escaped Decimal Entity	Escaped Hex Entity
&	Ampersand	&	&	&
<	Less Than	&lt;	&#60;	&#x3C;
>	Greater Than	&gt;	&#62;	&#x3E;
"	Double Quote	&quot;	&#34;	&#x22;
'	Single Quote (Apostrophe)	&#39;	&#39;	&#x27;

Code Examples: Raw vs. Escaped Output

Example 1: Code Block with Links

• Raw HTML: html<a href=”https://example.com” target=”_blank”>Visit Site & Save</a>
• Escaped Output: html&lt;a href=&quot;https://example.com&quot; target=&quot;_blank&quot;&gt;Visit Site &amp; Save&lt;/a&gt;

Example 2: Embedded Script Tag

• Raw HTML: html<script type=”text/javascript”>alert(‘Protected’);</script>
• Escaped Output: html&lt;script type=&quot;text/javascript&quot;&gt;alert(&#39;Protected&#39;);&lt;/script&gt;

HTML Escaping vs. URL Encoding: What’s the Difference?

While both techniques prepare text safely for web protocols, they serve different layers:

• HTML Escaping: Prepares strings for safe rendering within an HTML document DOM tree. Converts characters like <, >, and & into <, >, and &.
• URL Encoding (Percent-Encoding): Prepares query strings and parameters for HTTP requests over the network. Converts spaces and reserved URI delimiters into %20, %26, %3D, etc.

Escaping and Unescaping HTML FAQs

What is the difference between escaping and unescaping HTML?

Escaping converts reserved characters (<, >, &, ", ') into their corresponding entity codes (such as < and >) so browsers render them as raw text. Unescaping reverses this conversion, transforming encoded entities back into operational markup syntax.

Does escaping HTML stop all XSS attacks?

HTML escaping is a foundational layer of XSS defense for HTML body contexts, but context matters. If inserting untrusted user data into JavaScript blocks, CSS stylesheets, or URL attributes (href="javascript:..."), dedicated contextual sanitizers and Content Security Policies (CSP) must also be implemented.

Why is the single quote escaped as ' instead of '?

While ' is standard in XML and HTML5, older browsers (notably Internet Explorer 8 and below) did not support ' in standard HTML4 mode. Using numeric decimal ' guarantees universal backward and cross-browser compatibility.

Is my code private when using this tool?

Yes. The conversion is executed 100% locally in your browser using client-side JavaScript. No pasted code or output is recorded, stored, or transmitted over any network server.