HTML Entity Encoder

Convert the five HTML-significant characters to and from their named entity references. Encoding escapes & < > " ' so that arbitrary text can be safely embedded inside HTML without being interpreted as markup. Decoding reverses the conversion, recognizing both the named forms and the numeric &#39; / &#x27; variants.

1. Toggle the Encode or Decode mode tab.\n2. In Encode mode, enter plain text or HTML to escape; in Decode mode, enter a string containing HTML entities.\n3. Click the Encode / Decode button.\n4. Copy the result with the Copy button in the output card.

Five characters are mapped to their named entities on encode: & → &amp;, < → &lt;, > → &gt;, " → &quot;, ' → &#39;. The decoder matches the pattern &(?:amp|lt|gt|quot|#39|#x27);, so it recognizes the apostrophe in either its decimal form (&#39;) or hex form (&#x27;) in addition to the four named entities. All other characters pass through unchanged in both directions.