HTML Entities Encode and Decode converts between plain text and HTML entities. Type in either box and the other follows. Encoding has three modes: named where a name exists, minimal for just the markup-significant characters, and numeric for everything non-ASCII.
It runs in the page. Nothing you type is uploaded.
A curated set: Latin-1, common punctuation and symbols, Greek letters, arrows, and currency. Decoding also handles any decimal or hex numeric reference.
It escapes only & < > " ' — enough to be safe inside HTML while leaving accented letters and symbols readable.
No. On decode, a name that is not in the table and a malformed reference are left exactly as they were.
No. It is a local transform in your browser.