HTML Entity Encoder: Encode and Decode HTML Entities
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HTML entities are special codes that represent reserved or special characters in HTML. Without them, characters like <, >, and & would break your HTML structure or expose your site to XSS attacks.
The 5 Most Important HTML Entities
&The & symbol starts all HTML entities, so it must always be encoded
<Less-than opens HTML tags โ must be encoded in text content
>Greater-than closes HTML tags โ encode for safety
"Double quote is used in attribute values โ encode inside attr="..."
'Single quote is used in attribute values โ encode inside attr='...'
When to Encode HTML Entities
- โข In template engines: When outputting user-provided data into HTML (prevents XSS)
- โข In email templates: HTML email clients are strict โ always encode special characters
- โข In attribute values: Any quotes inside attributes need encoding
- โข Displaying code: Use < and > to show <html> tags visually
- โข Special symbols: Use ©, ™, € for ยฉ โข โฌ in HTML
When NOT to Encode
Don't encode characters that are inside <script> or <style>tags โ those contexts have their own escaping rules. Also don't double-encode already-encoded entities (turning & into &amp;).
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