HTML Entity Encoder & Decoder

Encode special characters into Named, Decimal, or Hex HTML entities and decode entities back to plain text with safe sandboxed preview.

Sample Presets:

Raw HTML or Text Input

0 chars0 lines

1
​
Paste HTML or text here
Encode special characters or decode HTML entities.

0 chars0 lines

1
​
Encoded HTML will appear here
Run Encode or Decode to see the result.

Awaiting HTML or plain text (W3C HTML5 Entities)

Zero network calls • Client-side processing

Web Asset & Markup Sanitization Workflow

Escape markup entities, generate safe HTML attributes, and test sandboxed rendering.

Step 01Active Step

Encode HTML Entities

Convert dangerous or non-ASCII characters to HTML entities (W3C HTML5).

Step 02

Encode URL Parameters

Encode links and query strings for anchor tag href attributes.

Open URL Encoder & Decoder

Step 03

Format Embedded JSON

Format JSON state embedded inside script tags or data attributes.

Open JSON Formatter & Validator

Developer Documentation & Guidance

Practical developer scenarios, best practices, and common mistakes to avoid.

When Should I Use This Tool?

•Escaping user-supplied text before rendering inside HTML templates or XML documents (prevents XSS).
•Converting symbols (©, ™, €, £) into named or numeric HTML entities for cross-platform email templates.
•Decoding entity-encoded content scraped from HTML source code or CMS databases.
•Attribute-safe mode for safely populating HTML element attributes (title, value, data-*).

Developer Best Practices

✓Always escape at minimum the 5 core special characters: <, >, &, ", and '.
✓Use numeric decimal (&#...;) or hex (&#x...;) entities if named entities are not supported by your XML parser.
✓Always preview decoded HTML inside a strictly sandboxed iframe to prevent script execution.

Common Developer Mistakes

!Failing to escape ampersands (&) first, causing double-escaping of existing entities.
!Treating HTML entity encoding as sufficient for JavaScript contexts (use JSON serialization instead).
!Using broken surrogate pairs when encoding high Unicode characters (emojis).

Keyboard Shortcuts Help

Encode HTMLCtrl + Enter

Decode HTMLCtrl + Shift + Enter

Copy OutputCtrl + Shift + C

Load PresetsAlt + 1 / 2 / 3 / 4

Related Encoding & Decoding Tools

Utilities belonging to the Encoding & Decoding domain.

Base64 Encoder & Decoder

Encode and decode Base64 string formats, URL-safe variants, Hex data, and binary files with UTF-8 support.

Open

URL Encoder & Decoder

Encode and decode URI query parameters, full URLs, form-urlencoded data, and inspect URL components with an interactive query table.

Open

HTML Entity Encoder & Decoder

Encode special characters into Named, Decimal, or Hex HTML entities and decode entities back to plain text with safe sandboxed preview.

Sample Presets:

Raw HTML or Text Input

0 chars0 lines

1
​
Paste HTML or text here
Encode special characters or decode HTML entities.

0 chars0 lines

1
​
Encoded HTML will appear here
Run Encode or Decode to see the result.

Awaiting HTML or plain text (W3C HTML5 Entities)

Zero network calls • Client-side processing

Web Asset & Markup Sanitization Workflow

Escape markup entities, generate safe HTML attributes, and test sandboxed rendering.

Step 01Active Step

Encode HTML Entities

Convert dangerous or non-ASCII characters to HTML entities (W3C HTML5).

Step 02

Encode URL Parameters

Encode links and query strings for anchor tag href attributes.

Open URL Encoder & Decoder

Step 03

Format Embedded JSON

Format JSON state embedded inside script tags or data attributes.

Open JSON Formatter & Validator

Developer Documentation & Guidance

Practical developer scenarios, best practices, and common mistakes to avoid.

When Should I Use This Tool?

•Escaping user-supplied text before rendering inside HTML templates or XML documents (prevents XSS).
•Decoding entity-encoded content scraped from HTML source code or CMS databases.
•Attribute-safe mode for safely populating HTML element attributes (title, value, data-*).

Developer Best Practices

✓Always escape at minimum the 5 core special characters: <, >, &, ", and '.
✓Use numeric decimal (&#...;) or hex (&#x...;) entities if named entities are not supported by your XML parser.
✓Always preview decoded HTML inside a strictly sandboxed iframe to prevent script execution.

Common Developer Mistakes

!Failing to escape ampersands (&) first, causing double-escaping of existing entities.
!Treating HTML entity encoding as sufficient for JavaScript contexts (use JSON serialization instead).
!Using broken surrogate pairs when encoding high Unicode characters (emojis).

Keyboard Shortcuts Help

Encode HTMLCtrl + Enter

Decode HTMLCtrl + Shift + Enter

Copy OutputCtrl + Shift + C

Load PresetsAlt + 1 / 2 / 3 / 4

Related Encoding & Decoding Tools

Utilities belonging to the Encoding & Decoding domain.

Base64 Encoder & Decoder

Encode and decode Base64 string formats, URL-safe variants, Hex data, and binary files with UTF-8 support.

Open

URL Encoder & Decoder

Encode and decode URI query parameters, full URLs, form-urlencoded data, and inspect URL components with an interactive query table.

Open