Free tools

Free HTML Entity Encoder / Decoder

Convert unsafe characters to HTML entities and decode encoded strings safely for content migration and debugging.

Copy-paste outputs

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Tool 01

HTML Entity Encoder / Decoder

Encode and decode HTML entities safely for snippets, templates, and dynamic rendering.

HTML Entity Encoder / Decoder

Encode special characters for safe HTML embedding and decode entity text back to plain characters.

Input

Encoded output

// Encoded value will appear here

Decoded output

// Decoded value will appear here

How it works

HTML Entity Encoder / Decoder: methodology and worked example

How this tool computes its result

Encodes text via sequential replacements: & -> &, < -> <, > -> >, " -> ", ' -> '. Decoding leverages a textarea element set to innerHTML with the input; reading its value returns the decoded string. This works because the browser's HTML parser automatically decodes entities assigned to textarea.innerHTML. Both transformations are synchronous in-memory operations with no network calls.

Worked example

Encoding "Price: <$50>" produces "Price: <$50>" (angle brackets replaced). Encoding "He said "Hello"" produces "He said "Hello"". Decoding "<div class="test">" produces "<div class="test">", inverting the encoding steps.

When not to use this tool

This handles only the five most common HTML entities (ampersand, angle brackets, quotes) - it does not encode or decode specialized entities like  , ©, or numeric entities like €. For full entity support, use an external library.

Common mistakes

- Assuming the tool encodes all special characters - it encodes only the five core entities needed for safe HTML embedding; other characters like accented letters (e, n) pass through unchanged.
- Pasting pre-encoded text (e.g. "<div>") into Decode and expecting it to become "<div>" - if the text is already encoded, decoding it once does produce the result, but decoding again produces garbled output like "<div>" in plain text rather than an error.
- Using this for JavaScript string escaping - the tool is designed for HTML embedding; JavaScript strings require different escaping rules (backslash-escaping instead of entity codes), and using HTML entities in JavaScript strings does not produce the intended behavior.

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