HTML Entity Encoder — Encode & Decode HTML Entities Instantly

HTML Entity Encoder is a free, browser-based developer tool that converts special characters to HTML entities and back. Paste your text, choose a format, and copy the safe output — no setup, no signup, no data leaving your browser.

The Problem

Every developer who writes HTML templates, email HTML, or CMS content eventually runs into the same problem: special characters like <, >, &, and " must be escaped to be safely embedded in HTML. Without encoding, these characters break markup or, worse, open XSS vulnerabilities.

The alternatives — searching MDN for the right entity name, referencing a cheat sheet, or relying on incomplete framework escaping — are slow and error-prone. And decoding encoded HTML back to readable text is equally tedious when debugging templates or email clients.

How It Works

1. Paste Your Input

Drop any text containing special characters (for encoding) or any HTML with entity sequences (for decoding) into the input panel.

2. Choose Mode and Format

Encode mode converts your text to HTML entities. Choose from three output formats:

• Named — human-readable names: < → <, & → &, © → ©
• Decimal — numeric code points: < → <, & → &
• Hex — hexadecimal code points: < → <, & → &

Decode mode converts any mix of named, decimal, or hex entities back to plain text.

3. Copy the Result

One click copies the output to your clipboard. Paste directly into your code, template, or CMS.

Key Features

• Three encode formats — named entities, decimal numeric references, hex numeric references
• Full decode support — handles &, <, and < style entities simultaneously
• Quick-load examples — test with HTML markup, script tags, math symbols, currency signs, and special characters
• Entity reference table — built-in cheat sheet for the 12 most common entities (named, decimal, and hex)
• Live character count — input and output character counts update in real time
• 100% client-side — your text never leaves your browser
• No signup required — start using immediately

Technical Implementation

Core Technologies

• Next.js with App Router
• TypeScript in strict mode
• TailwindCSS for styling
• shadcn/ui for accessible components
• Framer Motion for animations

Architecture

• Pure JavaScript entity encoding/decoding — no DOM manipulation, no innerHTML, no security concerns
• Surrogate pair handling via Array.from() and codePointAt() for full Unicode support including emoji
• Reverse entity map for fast named entity decoding
• Named entity dictionary covering 80+ common HTML entities

Security

• All processing is purely local — no server-side execution, no data transmission
• The decode implementation uses manual regex parsing rather than innerHTML tricks, making it safe even with malicious input

Use Cases

Template Development

You're building Handlebars, Jinja2, or Blade templates. User-supplied content goes into HTML attributes. Use the encoder to correctly escape dynamic values before embedding them in attribute strings.

Email HTML

Email clients have notoriously inconsistent HTML support. Encoding non-ASCII characters and special symbols as named entities ensures they render correctly in Gmail, Outlook, Apple Mail, and others without relying on charset declarations.

CMS Content

WordPress, Contentful, and many other CMSes interpret < and > literally in certain fields. Encoding them as entities lets you insert code samples or formatted text into body copy without triggering HTML parsing.

XSS Prevention Audit

Auditing a codebase for XSS vulnerabilities? Paste user-input strings through the encoder to verify that your output escaping is equivalent — and to generate correctly encoded test payloads.

Debugging Encoded Output

Found double-encoded text like < in your logs or database? Paste it into decode mode to unravel the layers and understand what went wrong upstream.

Learning & Documentation

Writing API documentation or developer guides that include HTML code samples? Use the tool to generate the correctly encoded versions of your examples for embedding in Markdown or MDX files.

Why HTML Entity Encoder?

vs. Browser DevTools

• Purpose-built — designed for entity encoding, not general debugging
• Multiple formats — named, decimal, and hex output in one place
• Copy-ready — output formatted for direct use in code
• Reference table — entities cheat sheet built in

vs. Online Alternatives

• Privacy-first — no data sent to servers, no logging
• No ads — clean, distraction-free interface
• No rate limits — process as much text as you need
• Three formats — most tools only support one

vs. Code-Level Escaping

• Visual — see the encoded output before using it
• Format choice — pick named, decimal, or hex based on your context
• Instant — no need to write a script or open a REPL
• Decode too — works in both directions

Results

HTML Entity Encoder reduces friction in day-to-day web development:

• Instant encoding — convert any special character to any entity format in milliseconds
• Zero mistakes — computed entities are always correct, no manual lookup needed
• Privacy preserved — sensitive content stays in the browser
• No friction — no signup, no install, no configuration

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Try it now: html-entity-encoder.tools.jagodana.com