HTML Entity Encoder & Decoder

Safely convert special characters, symbols, quotes, and ampersands into named, decimal, and hex HTML entities in 0ms on Nivotools.online.

Entity Format:

Only HTML Special Chars (& < > " ')

Encode Non-ASCII / Symbols

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Input Text or HTML
0 chars • 0 lines

Processed Output

// Encoded or decoded result will appear here in real time...

Quick Actions:

Ready • Waiting for text input
Runs 100% locally in your browser

What is HTML Entity Encoding and Decoding?

In web engineering and browser DOM rendering, certain characters are reserved by the HTML and XML specifications because they represent syntax delimiters. For instance, the less-than symbol (<) and greater-than symbol (>) designate HTML tag boundaries, quotation marks (" and ') enclose attribute values, and the ampersand (&) signals the start of an entity reference. When raw user input contains these characters without escaping, browsers may interpret them as executable markup, causing broken layouts or Cross-Site Scripting (XSS) security vulnerabilities.

Nivotools.online provides a zero-latency, private client-side HTML entity encoder and decoder that maps sensitive characters to their corresponding named (<, >, "), decimal (<), or hexadecimal (<) entity representations and effortlessly reverses the process.

The 5 Reserved HTML/XML Characters Reference

According to the W3C HTML5 and XML specifications, the following five characters must be encoded inside HTML text nodes and attribute values:

Raw Character	Character Name	Named Entity	Decimal Entity	Hexadecimal Entity
`&`	Ampersand	`&`	`&`	`&`
`<`	Less than	`<`	`<`	`<`
`>`	Greater than	`>`	`>`	`>`
`"`	Double quotation mark	`"`	`"`	`"`
`'`	Single quotation mark (Apostrophe)	`'`	`'`	`'`

Common Symbols and Currency Entities

Symbol	Description	Named Entity	Decimal Code
`©`	Copyright Symbol	`©`	`©`
`®`	Registered Trademark	`®`	`®`
`™`	Trademark Symbol	`™`	`™`
`€`	Euro Sign	`€`	`€`
`£`	Pound Sterling	`£`	`£`
`¥`	Yen Sign	`¥`	`¥`
`•`	Bullet Point	`•`	`•`
	Non-Breaking Space	` `	` `

How to Encode and Decode HTML Entities in Programming Languages

JavaScript (Node.js & Browser): Use he.encode(str) / he.decode(str) library, or natively in the browser via DOM: elem.textContent = str to encode and elem.innerHTML = str; return elem.textContent to decode.
Python 3: Use import html; html.escape(str) to encode and html.unescape(str) to decode.
PHP: Use htmlspecialchars($str, ENT_QUOTES, 'UTF-8') or htmlentities($str) to encode, and html_entity_decode($str) to decode.
Go (Golang): Use html.EscapeString(str) and html.UnescapeString(str) from the standard html package.

Frequently Asked Questions (FAQ)

Why do I need to encode HTML entities?
Characters like <, >, ", and & carry syntactical meaning in HTML and XML. If you output raw user inputs containing these symbols without encoding, web browsers can mistake them for markup tags, triggering broken rendering or dangerous Cross-Site Scripting (XSS) injection attacks.
Can this tool decode decimal and hexadecimal numeric entities?
Yes. Our decoder recognizes all standard HTML5 named entities (©, ™, &), decimal numeric character references (©, ™), and hexadecimal character references (©, ™), converting them cleanly back to Unicode text.
Is my private text or HTML payload sent to remote servers?
No. All character translations, regex parsing, and entity decoding execute 100% client-side inside your browser sandbox using JavaScript. Zero server uploads, zero logs, 100% private.