Free HTML Entity Encoder / Decoder Online

What the HTML Entity Encoder / Decoder Does

Working with raw HTML means dealing with characters that have double lives. An ampersand is just punctuation in plain text, but in HTML it signals the start of an entity reference. A less-than sign is harmless until a browser reads it as the opening of a tag. When these characters show up unescaped in your markup, things break — layouts collapse, content disappears, or worse, you open the door to cross-site scripting (XSS) attacks.

The HTML Entity Encoder / Decoder converts special characters into their safe HTML entity equivalents, and converts entities back into readable characters. It handles named entities (like &), numeric entities (like &), and hexadecimal entities (like &), covering every Unicode character. Whether you are a frontend developer sanitizing user input, a content editor debugging garbled text, or a student learning how HTML escaping works, this tool gives you instant, accurate results.

Your text never leaves your browser. All encoding and decoding runs 100% client-side — no data is transmitted to any server, no text is logged, and nothing is stored. You can safely paste API keys, user data, or proprietary markup without concern.

How It Works

Step 1: Choose your mode. At the top of the tool you will find two toggle buttons — Encode and Decode. Encode mode converts raw text into HTML entities. Decode mode converts entity-encoded text back into readable characters. Click the one you need.

Step 2: Select an entity format (encode mode only). When encoding, pick from three output formats using the Entity Format buttons: Named (&), Numeric (&), or Hex (&). Named entities are the most human-readable and widely recognized. Numeric and hex formats cover the full Unicode range, which is useful when a character has no named entity — like emoji or less common symbols.

Step 3: Enter your text. Type or paste content into the input area. The output updates in real time as you type — no need to press a submit button. In encode mode, the five critical HTML characters (<, >, &, ", ') and any non-ASCII characters are converted to entities. In decode mode, all three entity formats — named, numeric, and hex, even mixed together in the same input — are resolved back to their original characters.

Step 4: Use the result. Click the Copy button to copy the output to your clipboard. If you want to reverse the operation, hit Swap — the output moves into the input field and the mode flips automatically. Use Clear to reset everything and start fresh.

Bonus: Quick Reference Table. Expand the collapsible Quick Reference section at the bottom to browse commonly used HTML entities organized by category: required characters, spacing, punctuation, currency, symbols, math operators, and arrows. Each entry shows the character itself alongside its named, numeric, and hex codes — a handy cheat sheet without leaving the page.

Why Use Our HTML Entity Encoder / Decoder

Most online HTML entity tools cover the basics but fall short in ways that matter. Here is what sets this one apart:

• Three output formats in one tool. Switch between named, numeric, and hex entities with a single click. Most competitors offer only named entities or force you to use separate tools for each format.
• Real-time conversion. Results appear instantly as you type. No form submission, no page reload, no waiting.
• Full Unicode support. Encode emoji, mathematical symbols, arrows, currency signs, CJK characters, and any other Unicode code point — not just the standard ASCII range.
• Bidirectional with swap. The Swap button flips your output into the input and toggles the mode, making round-trip verification effortless.
• Built-in reference table. Seven categories of common entities right inside the tool — no need to search Stack Overflow or MDN for the code you need.
• No signup, no limits, no ads gating features. Paste as much text as you want, as many times as you want.
• Completely private. Everything runs in your browser using JavaScript. Zero network requests. Your content stays yours.

Use Cases

Sanitizing user-generated content. Before displaying comments, forum posts, or form submissions in HTML, encode special characters to prevent them from being interpreted as markup. This is a critical first step in defending against XSS vulnerabilities.

Debugging template output. When a template engine or CMS produces garbled output — double-encoded entities like & or raw angle brackets leaking through — paste the result into decode mode to see exactly what went wrong and trace the encoding chain.

Preparing HTML for email templates. Email clients are notoriously inconsistent with character rendering. Converting special characters to numeric or hex entities ensures that symbols like curly quotes, em dashes, and the copyright symbol display correctly across Outlook, Gmail, Apple Mail, and others.

Writing technical documentation. When you need to display HTML code examples within an HTML page, every tag and entity in the example must be encoded so it renders as visible text instead of being parsed by the browser. Paste your code snippet, encode it, and copy the safe version directly into your documentation.

Inserting special symbols into web pages. Need a degree sign, a trademark symbol, or a set of arrow characters in your HTML? Use the quick reference table to find the correct entity code, or type the character directly and let the encoder produce the entity for you.

Learning HTML fundamentals. If you are studying web development, switching between encode and decode mode and toggling between named, numeric, and hex formats builds intuition for how browsers interpret character references under the hood.

Tips and Best Practices

Always encode the five critical characters. At minimum, <, >, &, ", and ' must be encoded whenever they appear in HTML content or attribute values. Skipping even one of these can break your markup or introduce security risks.

Use named entities for readability, numeric for coverage. Named entities like & and < are easy to spot when reading raw HTML. But not every character has a named entity — for emoji, mathematical notation, and obscure symbols, numeric (&#...;) or hex (&#x...;) entities are your only option.

Decode to debug, encode to deploy. If something looks wrong on a web page — garbled characters, missing symbols, broken layout — paste the raw source into decode mode to see what the browser is actually receiving. Then fix the source, re-encode, and deploy.

Do not double-encode. A common mistake is encoding text that has already been encoded, turning & into &. If your output looks like it has extra layers of encoding, decode first, verify the plain text, and then encode exactly once.

Pair with other developer tools. HTML entity encoding is one piece of the data-safety puzzle. For URL parameter values, use a URL encoder/decoder. For embedding binary data in HTML or JSON, reach for a Base64 encoder/decoder. Each encoding serves a different context — using the wrong one is a common source of bugs.