HTML Entity Encoder / Decoder

Safely encode special characters into standard HTML entities or decode HTML entities back to readable text with our incredibly fast, free online HTML entity tool. Convert potentially dangerous characters like <, >, &, and " instantly to prevent structural errors and secure your applications against devastating XSS vulnerabilities.

What Are HTML Entities and Why Use Them?

In HTML (HyperText Markup Language), certain characters have reserved programmatic meaning. For instance, the less-than sign < and the greater-than sign > are strictly used to declare structural container tags (like <div> or <script>).

However, what happens if you actually want to display a mathematical less-than sign to your reader in a paragraph of text? If you simply type 5 < 10 directly into your HTML document, the web browser's parser will mistakenly assume you are attempting to open a new HTML element named "10". This immediately breaks the layout geometry of your webpage.

An HTML Entity is a string of text that begins with an ampersand (`&`) and ends with a semicolon (`;`). By replacing the literal character with an entity reference—for example, converting < to <—the browser knows to render the visual symbol to the reader without executing it as background code.

HTML Escaping: The Ultimate Defense Against XSS Attacks

Beyond simple visual rendering, HTML Encoding (also known as "escaping") is fundamentally critical for application security. Cross-Site Scripting (XSS) is a severe vulnerability where malicious actors inject javascript code into input fields (like comment boxes, forum posts, or profile bios).

If your server outputs user-submitted content directly to the webpage without encoding it first, an attacker's payload (e.g., <script src="hacker.js"></script>) will execute maliciously in the browsers of innocent visitors. By passing untrusted text through our HTML Entity Encoder, dangerous syntax is neutralized into safe strings (e.g., <script src="hacker.js"></script>) which renders safely as plain text on the page rather than executable javascript logic.

How to Use the HTML Entity Converter

Converting back and forth takes a fraction of a second and requires no strict formatting rules:

1. Paste Your String: Insert the raw string or block of code you wish to manipulate into the primary textarea input.
2. Encode (Escape): Click this button if you have normal text or code snippets that you wish to safely display on a webpage. This function will aggressively convert quotes, ampersands, and angle brackets into their safe &name; equivalents.
3. Decode (Unescape): Click this button if you have scraped data from the web, or extracted data from a database, that is littered with ugly " or & tags. Decoding reverses the process and restores the text to normal, human-readable prose.
4. Instantly Copy: The output overwrites the input box instantly. Click the Copy button to capture the transformed text immediately to your clipboard.