🌐 HTML Encoder/Decoder
Encode and decode HTML entities
Encode and decode HTML entities
When you inject user or variable text into HTML, characters like `<`, `>`, `&`, and quotes can break markup or create cross-site scripting vectors. HTML encoding converts those characters to entities so browsers treat them as text, not tags.
Encode and decode HTML entities safely. Convert special characters to HTML entities and back.
Chief Technical Editor
When you inject user or variable text into HTML, characters like `<`, `>`, `&`, and quotes can break markup or create cross-site scripting vectors. HTML encoding converts those characters to entities so browsers treat them as text, not tags.
This page is useful for template authors, email HTML builders, and developers explaining sanitization to teammates. It also helps debug “my JSON string broke the attribute” incidents.
Use encode before inserting untrusted strings into HTML; decode when you intentionally need the original from safe storage.
A user’s display name is `Bob <script>…`. Encoding turns angle brackets into entities so the profile page renders the literal text instead of executing markup.
Context matters: attribute escaping differs from body text; always follow your framework’s sanitizer.
Encoding is not a full security program — pair with CSP, cookie flags, and server-side validation as appropriate.
Different contexts (HTML body, attribute, JS, CSS) need different escaping rules.
Prefer framework auto-escaping and reviewed libraries for production apps.
People use both terms; here we mean replacing dangerous characters with HTML entities.
When reading trusted stored HTML for editing, or when transforming between layers deliberately.
No. You must also control where data is injected (DOM APIs vs `innerHTML`) and use a holistic defense strategy.
Modern UTF-8 pages handle most characters; still escape controls where required.
Clients are quirky; encoding helps but test in real clients.
Local tooling avoids sending your sample markup to remote beautifiers.
Longer explanations that complement this calculator—same privacy-first, editorial tone.
A practical workflow for developers who want readable JSON and fewer “paste into random websites” mistakes.
A straightforward overview of client-side tools, optional Google ads, and how that maps to everyday privacy expectations.
When HTML or template code needs readable structure after encoding fixes.
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