When should I use each encoding scope?

Use "All Characters" for maximum obfuscation. Use "Special Characters Only" to ensure valid HTML while keeping most content readable — only , &, ", and ' are encoded. Use "Text Content Only" to encode text nodes while preserving HTML tags and attributes — ideal for encoding article content without affecting page structure.

Can entity encoding prevent XSS attacks?

Yes, properly encoding HTML entities is a fundamental defense against XSS. When user-generated content is entity-encoded, malicious tags become harmless text. However, entity encoding alone is not sufficient — always combine it with other security measures like CSP headers and input validation.

Will entity-encoded HTML still display correctly in browsers?

Yes. HTML entity encoding is a standard part of the HTML specification. All modern browsers correctly decode entities when rendering pages, displaying characters identically to their original counterparts. Whether you use decimal, hex, or named entities, the visual output is exactly the same.

Is my HTML code safe with this online entity encoder?

Absolutely. All HTML parsing, entity encoding, and output generation happen entirely in your browser using pure JavaScript. Your HTML source code never leaves your device. No data is uploaded to any server whatsoever — 100% private browser-local processing.

HTML Entity Encoder

Encode HTML into decimal (A), hexadecimal (A), or named entities (&) with flexible encoding scope. Choose to encode all characters, special characters only, or text content only. Live side-by-side preview with original vs encoded comparison, character encoding statistics, and file size impact analysis. 100% private — all processing happens in your browser.

HTML Entity Encoder

Encoding Method

Encoding Scope

HTML Input

Quick examples:

Paste HTML above or choose a quick example to see the encoding in action

100% Private: All HTML entity encoding happens entirely in your browser. Your HTML code is never sent to any server. No data leaves your device.

Why Use Our HTML Entity Encoder?

Multiple Encoding Methods

Encode HTML into decimal (A), hexadecimal (A), or named entities (&). Choose the encoding format that best suits your needs — decimal for universal compatibility, hex for compact representation, or named entities for readability. Switch between methods instantly with a single click.

Flexible Encoding Scope

Three encoding modes give you full control: encode all characters for maximum obfuscation, encode only HTML-special characters (< > & " ') to preserve readability while ensuring valid output, or encode only text content to leave HTML tags and attributes untouched. Perfect for selective obfuscation.

Live Side-by-Side Preview

See your original and encoded HTML side by side with real-time updates as you type. Monitor character encoding stats, original vs encoded size, and size increase percentage. Instantly verify that your encoding produces the expected output before using it in production.

100% Private Browser-Local Processing

Your HTML code never leaves your device. All entity encoding happens entirely in your browser using pure JavaScript — no uploads, no server-side processing, no tracking. Use it on sensitive HTML, proprietary markup, or confidential content with complete peace of mind.

Common Use Cases

Anti-Scraping & Data Protection

Encode HTML content to deter automated web scrapers and bots from easily extracting your text content. Entity-encoded text is rendered identically in browsers but requires additional parsing effort for scrapers, making bulk extraction more difficult without affecting your legitimate visitors.

Email & Contact Information Obfuscation

Encode email addresses, phone numbers, and other contact details as HTML entities to hide them from email harvesters and spam bots. While encoded text renders correctly in browsers, automated harvesters that parse raw HTML will not be able to decode the entities without additional processing.

Safe Embedding in CMS & Templates

When embedding HTML code inside CMS fields, template variables, or JavaScript strings, encoding HTML entities prevents premature tag parsing and rendering issues. Use entity encoding to safely include HTML examples, code snippets, or special characters in content management systems.

HTML Email Development

HTML emails benefit from entity encoding for special characters to ensure consistent rendering across email clients. Encode symbols, accented characters, and special punctuation to avoid character encoding issues in Outlook, Gmail, and other email clients that may not support certain character sets.

Database & Backend Integration

When storing HTML content in databases, entity encoding special characters prevents SQL injection-like issues and ensures the stored HTML can be safely retrieved and rendered. Particularly useful for user-generated content, WYSIWYG editor output, and HTML fragments stored in JSON fields.

Educational & Learning Resources

Demonstrate HTML entity encoding concepts in educational materials, tutorials, and documentation. Show how HTML entities work by providing interactive examples with different encoding methods. Help students understand the relationship between character codes, named entities, and their rendered output.

Understanding HTML Entity Encoding

What is HTML Entity Encoding?

HTML entity encoding is the process of replacing characters in HTML with their corresponding entity references. Each character can be represented by a numeric character reference (decimal: A or hexadecimal: A) or a named entity reference (< for <). Browsers automatically decode these entities when rendering the page, so the displayed content remains identical to the original.

Entity encoding serves multiple purposes: it prevents HTML special characters from being interpreted as markup, protects against cross-site scripting (XSS) when displaying user-generated content, and can make automated content extraction more difficult. Our HTML entity encoder supports all three encoding formats with flexible scope options for precise control over what gets encoded.

How Our HTML Entity Encoder Works

1. Select Your Encoding Method: Choose between decimal (A), hexadecimal (A), or named entities (<). Decimal encoding is the most widely supported format across all HTML versions and browsers. Hexadecimal encoding uses base-16 notation which can be more compact for certain character ranges. Named entities are limited to a predefined set of common characters but produce the most readable output.
2. Choose Your Encoding Scope: Select from three scopes: All Characters encodes every character (letter, number, symbol, and space) to its entity equivalent for maximum obfuscation.Special Characters Only encodes only the five HTML-sensitive characters (<, >, &, ", ') to maintain readability while ensuring valid HTML. Text Content Only intelligently parses the HTML structure and encodes only text nodes, leaving tag names and attributes untouched.
3. Review and Export: The encoded output is generated instantly as you type. Compare original and encoded versions side by side, review character encoding statistics, and monitor the size impact. Copy the encoded HTML to your clipboard, download it as an HTML file, or swap it back to the input area for further editing.

Encoding Methods Explained

Decimal Character References: Each character is represented by its Unicode code point in decimal notation. For example, A (U+0041) becomes A, < (U+003C) becomes <, and & (U+0026) becomes &. Decimal encoding is supported in all HTML specifications and all browsers, making it the most universal option. The format is &#NNNN; where NNNN is the decimal code point.
Hexadecimal Character References: Characters are represented using hexadecimal (base-16) notation of their Unicode code point. A becomes A, < becomes <, and & becomes &. Hexadecimal encoding can be more intuitive for developers familiar with hex color codes and memory addresses. The format is &#xNNNN; where NNNN is the hexadecimal code point.
Named Entity References: A predefined set of common characters have human-readable names. < (less-than), > (greater-than), " (quotation mark), ' (apostrophe), and & (ampersand) are the five most commonly used HTML entities. Named entities produce the most readable encoded output but cover only a limited set of characters — characters without named entities fall back to decimal encoding.

Important Considerations

HTML entity encoding is not encryption. Entity encoding is a character representation technique, not a security mechanism. Any browser or simple HTML parser can decode entities back to their original characters. The encoding serves as a deterrent against basic content scraping and a tool for safe HTML embedding — it does not provide confidentiality or tamper protection for your content.

Size impact: Encoding characters as entities increases the size of your HTML. For example, a single & character (1 byte) becomes & (5 bytes) when encoded as a named entity — a 5x size increase. Decimal and hex encoding typically result in 3-6x size increases per character. Be mindful of this when encoding large documents or pages where bandwidth is a concern. This tool processes all HTML locally in your browser with no server-side data transfer.

Frequently Asked Questions

An HTML entity encoder is a tool that replaces characters in HTML with their corresponding entity references. Characters can be encoded as decimal numeric references (A), hexadecimal numeric references (A), or named entities (<). Browsers decode these entities when rendering the page, so the displayed content looks identical while the source code contains the encoded versions.

Decimal entities (A) use the Unicode code point in base-10 and are universally supported across all HTML specifications and browsers. Hexadecimal entities (A) use base-16 notation and can be more intuitive for developers. Named entities (&, <, >) use human-readable names but are limited to a predefined set of characters — characters without named equivalents fall back to decimal encoding in our tool. For most use cases, decimal encoding is the safest choice for maximum compatibility.

Use "All Characters" when you want maximum obfuscation and size impact is not a concern — every character including letters and numbers is encoded. Use "Special Characters Only" when you want to ensure valid HTML output while keeping most of your content readable — only <, >, &, ", and ' are encoded. Use "Text Content Only" when you want to encode the content of text nodes while preserving HTML tags and attributes exactly — this is ideal for encoding article content without affecting page structure.

Yes, properly encoding HTML entities is a fundamental defense against cross-site scripting (XSS) attacks. When user-generated content is entity-encoded before being inserted into HTML, any malicious <script> tags or event handlers become harmless text because the angle brackets and quotes are encoded. However, entity encoding alone is not sufficient — always combine it with other security measures like Content Security Policy (CSP) headers and input validation.

Yes. HTML entity encoding is a standard part of the HTML specification, and all modern browsers correctly decode entities when rendering pages. The encoded characters are displayed identically to their original counterparts. Whether you use decimal, hex, or named entities, the visual output in any browser will be exactly the same as the original unencoded HTML.

The size increase depends on the encoding method and scope. For "Special Characters Only" mode, only the five special characters are expanded — a & becomes & (5 bytes instead of 1), and < becomes < (4 bytes instead of 1). For "All Characters" mode, every character is expanded to 4-7 bytes, which can result in a 3-6x size increase. Use "Text Content Only" mode to limit the increase to only visible text content while keeping markup at its original size.

Absolutely. All HTML parsing, entity encoding, and output generation happen entirely in your browser using pure JavaScript. Your HTML source code, including any sensitive content, proprietary markup, or confidential information, never leaves your device. No data is uploaded to any server whatsoever. This is 100% private browser-local processing.

Yes. HTML entities are designed to be reversible. You can decode entity-encoded HTML by using our HTML entity decoder tool, or by any standard HTML parser. Browsers do this automatically when rendering pages. If you've encoded your content and need to retrieve the original, simply paste the encoded HTML into our tool and decode it back.

Yes, our HTML entity encoder is 100% free with no hidden costs or limitations. There is no signup required, no premium tier, no usage limits, no file size restrictions, and no advertisements. Use it unlimited times for any personal or commercial project. All processing happens locally in your browser with complete privacy.