Tools Online Editors Calculators Interview Prep About Contact
Developer Tool

HTML Encoder & Decoder

Encode and decode HTML entities and special characters safely in your browser

Local Escaping
Zero Server Logs
Standard Entity Mapping
Offline Capable
Samples:

Input HTML / Text

Encode Mode
0 chars

Converted Result

🔄

Awaiting Output

Converted HTML will appear here

HTML Live Render Preview

Sandboxed iframe live rendering of the decoded HTML tree (Scripts are disabled for safety)

Preview Actions:
Device Width:
👁️

No Preview Available

Live HTML preview will appear here.

HTML Entity Encoding Guide

Learn about HTML specification encoding rules and cross-site scripting (XSS) security

How to Use HTML Tool

  • 1
    Select Conversion Mode

    Select "Encode" (converts elements to entity representations like <) or "Decode" (restores HTML characters to standard readable tag symbols).

  • 2
    Enable Autopilot Filters

    Ensure "Auto Mode" is enabled to view updates in real-time as you type, drag/drop, or click sample buttons.

  • 3
    Preview Output Layout

    Enable "Live HTML Preview" to inspect a sandboxed browser render of the decoded HTML tree safely without running harmful scripts.

  • 4
    Export and Persist

    Use the Quick Copy or direct text Download buttons to save the converted layout locally. Preference variables are cached in your browser.

Key HTML Encoding Rules

HTML entity encoding replaces reserved symbols (e.g. <, >, &, ") with named entity counterparts to prevent browser parsing errors.
XSS Protection: Escaping brackets and characters is crucial for sanitizing user-submitted text inputs before rendering on pages.
Named vs Numbered: Entities can be referenced by character name (&copy;) or by unicode decimal code points (&#169;).
Sandboxed Rendering: Our Live Preview uses native HTML5 iframe sandboxing, preventing local storage access, cookies, and scripts from executing.
Local Security: All coding/decoding operations are performed client-side inside your browser sandbox. No content is uploaded to any server.

Frequently Asked Questions

What is HTML encoding?

HTML encoding converts special characters into named HTML entities (like `&lt;` for `<`) to prevent browsers from parsing them as code.

Why do I need to escape HTML characters?

Escaping renders HTML markup as plain text on a web page, preventing unexpected layout breaks or security vulnerabilities.

How do I decode HTML entities?

Paste the escaped HTML text into the input field. The tool will restore standard character glyphs instantly.

Does HTML encoding protect against Cross-Site Scripting (XSS)?

Yes. Escaping user input before rendering it in HTML context prevents malicious scripts from running in user browsers.

Is my code sent to a remote server?

No. The conversion is handled entirely in your local browser using client-side JavaScript.

Can I encode a whole HTML document?

Yes. The tool converts all occurrences of `<`, `>`, `&`, `"`, and `'` throughout the input text.

What is the difference between HTML encoding and URL encoding?

HTML encoding escapes tags for web pages. URL encoding escapes query strings for browser address bars.

Does the tool support both decimal and named entities?

It is optimized for standard named entities (like `&quot;`) which are highly readable and cross-browser compatible.

Related Tools

You may also find these useful.

⚡

Base64 Encoder

Encode and decode Base64

🌐

URL Encoder & Decoder

Encode and decode URLs instantly using a free online URL encoder and decoder.

⏰

Cron Expression Generator

Generate cron expressions visually and understand schedules instantly.

📱

QR Code Generator

Generate QR codes instantly from URLs, text, emails and phone numbers.

🔑

Password Generator

Generate strong and secure random passwords instantly in your browser.