Web & SEO

HTML Encoder Decoder — Free 2026

Encode special characters to HTML entities or decode HTML entities back to plain text instantly.

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Understanding HTML Encoding

HTML encoding (also called HTML escaping) is the process of replacing characters that have special meaning in HTML with their corresponding entity references. The five critical characters are: ampersand (&), less-than (<), greater-than (>), double quote ("), and single quote ('). Without encoding, browsers interpret these characters as part of the HTML markup itself, which can break your page layout or — more seriously — create cross-site scripting (XSS) security vulnerabilities.

Why HTML Encoding Matters for Security

Cross-site scripting (XSS) is one of the most common web security vulnerabilities, and it exploits the failure to encode user input before rendering it in HTML. If a user submits <script>alert('XSS')</script> as their name and your application displays it without encoding, the browser will execute that JavaScript. Proper HTML encoding converts the angle brackets to < and >, causing the browser to display the text literally instead of executing it. Every web framework includes built-in encoding functions for this reason.

Named vs Numeric Entities

HTML supports two types of entity references. Named entities use a human-readable keyword like & for ampersand or © for the copyright symbol. Numeric entities use the Unicode code point, either in decimal (&) or hexadecimal (&) form. This tool uses named entities for the five core characters and the browser's native parser for decoding all entity types. For counting characters in your encoded output, try our character counter, or use the slug generator to create clean URLs from text that might contain special characters.

When to Encode and Decode

Encode HTML when inserting dynamic text into HTML documents, building HTML strings in JavaScript, displaying code examples on a web page, or storing HTML-safe text in databases. Decode HTML entities when extracting readable text from HTML source, processing content from APIs that return encoded HTML, or converting entity-heavy content back to plain text for display in non-HTML contexts like emails or PDFs. This tool handles both directions instantly with no server-side processing — everything runs in your browser.

Frequently Asked Questions

What is HTML encoding?

HTML encoding replaces special characters like <, >, &, and quotes with their corresponding HTML entities (< > & "). This prevents browsers from interpreting those characters as HTML markup, which is essential for displaying code snippets and preventing XSS attacks.

When should I encode HTML entities?

You should encode HTML entities whenever you display user-generated content on a web page, embed code snippets in HTML, or include special characters in HTML attributes. This prevents broken layouts and cross-site scripting (XSS) vulnerabilities.

What characters does this tool encode?

This tool encodes the five characters that have special meaning in HTML: ampersand (&) becomes &, less-than (<) becomes <, greater-than (>) becomes >, double quote (") becomes ", and single quote (') becomes '.

How does HTML decoding work?

HTML decoding reverses the encoding process by converting entity references back to their original characters. This tool uses the browser's built-in HTML parser to safely decode all named and numeric HTML entities.