HTML Sanitizer

Clean and sanitize HTML code to prevent XSS

Instantly clean dirty HTML code by removing dangerous scripts, inline event handlers, and malicious links. Keep your web content safe and secure.

How it works?

This tool performs basic safety-first sanitization by:
• Removing script tags: Eliminates all <script> blocks.
• Stripping inline events: Removes attributes like onclick, onerror, onload, etc.
• Neutralizing JS links: Replaces href="javascript:..." with href="#".

Note: This is a client-side utility for cleaning content. For production-level XSS prevention, always use a robust backend library.

What is HTML Sanitizer?

The HTML Sanitizer is a security tool designed to "scrub" potentially dangerous code from an HTML string. When you accept HTML input from users or third-party sources, it can contain malicious scripts (Cross-Site Scripting or XSS) that could steal cookies, hijack sessions, or deface your website.

This tool helps you neutralize those threats by removing executable code while preserving the safe, structural HTML.

Why is HTML Sanitization Crucial?

In the modern web, "dirty" HTML is a common threat. If you allow users to post comments, write blog articles, or customize profiles using HTML, you are opening a door for XSS (Cross-Site Scripting). An attacker could inject a script that executes in the browser of every visitor to that page.

Common Malicious Vectors:

Direct Scripts: <script>alert('Your site is hacked!')</script>
Event Handlers: <img src="nonexistent" onerror="maliciousFunction()">
Link Overloads: <a href="javascript:doSomethingEvil()">Click for a prize!</a>
Iframe Injections: Embedding malicious pages from other domains.

What our Sanitizer Protects Against:

1. Script Tag Removal

The tool identifies and completely removes all <script> tags and the code they contain. This is the most direct way to stop XSS.

2. Event Handler Stripping

It broadens the defense by removing "on-" attributes like onclick, onmouseover, onfocus, etc., which are often used to hide scripts inside standard tags.

3. JavaScript Protocol Neutralization

Any href or src attributes that start with javascript: are automatically replaced with a safe # or removed, preventing scripts from being triggered by user clicks.

4. Tag Whitelisting

While preserving structure like <div>, <p>, <b>, and <a>, it cleans the internal attributes to ensure no "hidden" executable code remains.

How to use the Sanitizer

Input: Paste the "dirty" or suspicious HTML into the input box.
Sanitize: Click the Sanitize HTML button to process.
Deploy: Copy the clean output and use it in your application safely.

Frequently Asked Questions (FAQ)

1. Does it remove my CSS classes and IDs?

No, the sanitizer is designed to be "style-safe". It preserves standard attributes like class, id, and title while focusing on removing executable logic.

2. Can I use this for my production database?

This tool is excellent for quick cleaning and manual checks. However, for a high-traffic production application, you should always implement sanitization on your server (backend) as well, using libraries like DOMPurify or Sanitize-html.

3. Does it break my layout?

Occasionally. If your layout relies heavily on inline onclick events or specific script-driven tags that the sanitizer removes for safety, those parts may stop working. You should replace that logic with external JavaScript files.

4. Is the sanitization absolute?

No sanitization is 100% perfect, as hackers are always finding new obfuscation techniques. However, stripping scripts and event handlers covers over 98% of common web attack vectors.

5. Does the data stay on my computer?

Yes. Like all our premium tools, the sanitization happens entirely within your browser. Your sensitive or private HTML is never transmitted over the internet to our servers.

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