Crypto

HTML Entity Encoder / Decoder

Encode special chars to HTML entities. Decode back. 100% client-side.

Encodes: & < > " '

100% client-side. Use to prevent XSS.

How to use

  1. Enter a domain, URL, or value relevant to HTML Entity Encoder / Decoder.
  2. Run the check and review the output carefully.
  3. Apply recommended fixes, then run the check again to verify.

Common use cases

  • Pre-deployment validation for HTML Entity Encoder / Decoder.
  • Incident triage when security checks fail in production.
  • Periodic security review as part of technical SEO and hardening.

Example inputs

<script>alert(1)</script>Hello & World

Common issues and fixes

XSS via unescaped input

User input with < > & can execute scripts. Always encode before output.

Double encoding

Encoding twice produces &amp;amp;. Decode once before display or re-encode.

Wrong context

HTML entities for HTML. Use JavaScript escape for JS strings, URL encode for URLs.

Recommended remediation

Encode & < > " ' before inserting into HTML. Use &amp; &lt; &gt; &quot; &#39;. Decode in reverse order.

FAQ

Is HTML Entity Encoder / Decoder free to use?

Yes. This tool is free and can be used without account registration.

Do you store submitted values?

Only the minimum processing needed for the check. For client-side tools, data stays in your browser.

How should I use these results?

Use the output as a diagnostic baseline, apply fixes in your stack, then re-run the check to confirm remediation.

Related security tools

Base64 Encoder / Decoder

Encode and decode text to and from Base64 format. Fully client-side — your data never leaves the browser.

URL Encoder / Decoder

Encode and decode URLs with percent-encoding. Component mode for query params. 100% client-side.

JavaScript Escape / Unescape

Escape or unescape JS string literals. 100% client-side.