HTML Encoder / Decoder
Encode special characters to HTML entities or decode HTML entities back to readable text for web development.
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About HTML Encoder / Decoder
Handle HTML Entities Without Breaking Your Code
If you have ever displayed user-generated content on a webpage and seen raw HTML tags rendering where they should not, or angle brackets mysteriously disappearing from your output, you have run into the HTML encoding problem. The HTML Encoder/Decoder converts special characters into their HTML entity equivalents and back again. Characters like less-than signs, greater-than signs, ampersands, quotation marks, and other reserved HTML characters are converted to their safe entity forms so they display correctly in web pages without being interpreted as HTML markup.
On the encoding side, the tool converts characters like < to <, > to >, & to &, and " to ". These are the characters that have special meaning in HTML and can cause problems when they appear in content that gets inserted into web pages. On the decoding side, it reverses the process - taking entity-encoded text and converting it back to readable characters.
Why This Matters for Web Development
HTML encoding is a fundamental security practice in web development. One of the most common web vulnerabilities - Cross-Site Scripting (XSS) - exploits the failure to properly encode user input before displaying it on a page. If a user submits a comment containing a script tag and your application displays it without encoding, that script will execute in every visitor browser. Proper HTML encoding neutralises this attack by ensuring that script tags are displayed as text rather than executed as code.
Beyond security, encoding is necessary for correct display. If your content contains an ampersand - like "Tom & Jerry" - and you put it in HTML without encoding the ampersand, the browser might try to interpret what follows as an HTML entity, potentially mangling your text. Encoding the ampersand as & ensures it displays correctly.
Common Use Cases
Developers building CMS platforms, blog engines, comment systems, or any application that displays user-generated content need to encode output consistently. This tool lets you test encoding behaviour quickly - paste in some text with special characters, see the encoded output, and verify that your application would produce the same result.
Email template developers frequently need to encode special characters in HTML emails, which have stricter rendering rules than web pages. What works in Chrome might break in Outlook if entities are not properly encoded. Testing with this tool before sending a campaign to thousands of recipients prevents embarrassing rendering issues.
Technical writers who include code snippets in HTML documentation need to encode the code so that it displays as text rather than being parsed as markup. If you are writing a tutorial about HTML and you want to show the reader a div tag, you need to encode the angle brackets so the browser shows <div> instead of creating an actual div element.
The Decoding Side
Decoding is equally useful. If you receive HTML-encoded content from an API, a database export, or a web scraping operation, the encoded entities make the text hard to read. Strings like &amp;#39; nested several levels deep are a common headache when data passes through multiple encoding layers. The decoder untangles these, giving you clean readable text.
Sometimes you encounter double-encoded or triple-encoded entities - the result of content being encoded multiple times as it passes through different systems. The decoder helps you progressively decode these layers until you reach the original text.
Quick and Reliable
The tool processes your text entirely in the browser. Paste in your content, click encode or decode, and copy the result. It handles all standard HTML entities including named entities (like for non-breaking space), numeric entities (like © for the copyright symbol), and hexadecimal entities. Whether you are a seasoned developer who needs a quick utility or a beginner learning about HTML entities for the first time, this tool delivers instant, accurate results.