HTML Entity Codec

Encode and decode HTML entities with 3 tabs: Encode/Decode (named, decimal, hex, all-non-ASCII modes with swap and stats), Character Lookup (enter any character, entity, or code point to see all representations including Unicode, UTF-8 size), and Reference Table (45+ named entities organized by category: common, math, arrows, Greek, punctuation with search and copy). Supports bidirectional conversion with entity count display.