HTML Entity Encoder & Decoder

The AxelBase HTML Entity Encoder & Decoder is a zero-server, privacy-first, lightning-fast web utility built for developers, security engineers, content creators, and anyone who works with raw HTML.

In 2025, even with React, Vue, and Svelte auto-escaping most output, direct DOM manipulation, legacy templates, CMS exports, JSON-in-HTML, and user-generated content still require manual entity encoding. A single unescaped <, &, or invisible Unicode character can break layouts, corrupt data, or — worst of all — enable XSS attacks.

This tool was born from real-world frustration: every existing online encoder was either slow, bloated with ads, sent your data to unknown servers, or failed on large inputs. We decided to fix that — permanently.

Built entirely with SvelteKit + TypeScript + Bootstrap 5 and deployed as a 100% static site on GitHub Pages, this encoder runs completely in your browser. No backend. No tracking. No data ever leaves your device. You can even save the page and use it offline forever.

Under the hood, it uses a hand-crafted, dependency-free encoding engine that processes 50,000+ characters in under 10ms — faster than any npm library or online alternative. It intelligently chooses named entities (e.g., ©) when universally safe, and falls back to numeric (©) for maximum compatibility across HTML, XML, JSON, and email.

We support full Unicode, including emojis, mathematical symbols, zero-width characters, and right-to-left overrides. The decoder normalizes all legacy inconsistencies (' vs ' vs ") so you never ship broken content again.

This isn’t just a tool — it’s a statement: great developer utilities should be fast, private, beautiful, and free. That’s why everything is open-source under the MIT license. Fork it, embed it, improve it.

Built with care by developers, for developers — because proper HTML entity handling should never be a compromise.

Using the AxelBase HTML Entity Encoder & Decoder is designed to be intuitive, instant, and foolproof. Here’s everything you need to know:

1. Just Paste Your Text

Click in the left Input box and paste any text — from a single character to a 100KB CMS export. The tool instantly begins processing with zero delay.

2. Auto-Detection (Smart Mode)

Our algorithm analyzes your input in real time. If it detects a high ratio of &, <, or > followed by letters/semicolons, it assumes you want to Decode and switches automatically after 800ms — with a helpful “Suggested” badge so you’re never confused.

3. Manual Control

Prefer full control? Use the Encode and Decode tabs at the top to lock your preferred mode. The tool remembers your choice until you paste something obviously different.

4. Instant Output

The right Output box updates on every keystroke. No “Convert” button needed. What you see is exactly what you’ll get when you copy.

5. One-Click Copy

Hit any Copy or Copy Output button to send the perfectly encoded/decoded text to your clipboard. A bold toast confirms success.

6. Quick Examples

Not sure where to start? Use the preset buttons:

• XSS Test — See how dangerous payloads become harmless
• Copyright — Proper symbols and trademarks
• French Text — Accented characters done right
• Math Symbols — Full Unicode support
• HTML Tags — Safe embedding in attributes and content

7. Cheat Sheet

Expand the collapsible panel below for the most common entities at a glance.

Pro tip: Bookmark this page or save it locally (Ctrl+S) — it works 100% offline with no quality loss.