HTML Entity Encoder & Decoder
Reads the text and an encode/decode mode. Encode replaces &, <, >, quotes and apostrophes with named or numeric entities; decode uses a browser textarea when available, then returns plain text.
About this html entity encoder & decoder
Reads the text and an encode/decode mode. Encode replaces &, <, >, quotes and apostrophes with named or numeric entities; decode uses a browser textarea when available, then returns plain text Transforms and validates developer data structures locally, preventing confidential payload exposure during data wrangling.
Syntax parsing & data transformation logic
Provides standards-compliant encoding, decoding, and unique identifier generation covering POSIX Unix epoch timestamps, ISO 8601 / RFC 3339 extended calendar formats, RFC 4122 Universally Unique Identifiers (UUIDv4 pseudorandom, UUIDv7 millisecond time-ordered), ULID (Universally Unique Lexicographically Sortable Identifier), and W3C HTML5 entity character references. Timestamp conversions utilize high-precision integer arithmetic to prevent 32-bit Year 2038 signed rollover bugs, while UUID generation taps directly into the browser's cryptographically secure pseudo-random number generator (CSPRNG, crypto.getRandomValues).
Worked conversion & output example
Scenario: Encode the five supported HTML entity characters.
Sample input:
Processing: Apply the fixed encode replacement table.
Illustrative output:
Syntax constraints & input size limits
Encoding handles only five characters. Decoding depends on browser DOM support; in a non-DOM runtime only five fixed entity forms are decoded. Unknown mode text falls back to encoding.
Data conversions and formatting in HTML Entity Encoder & Decoder reflect standard structured syntax. Verify parsed outputs against your target runtime before deployment.
Local client execution boundary
Data parsing and transformations in HTML Entity Encoder & Decoder execute in the local browser tab without remote data transmission.
Data format specifications & language standards
Data interchange formats and language grammar specifications:
HTML Entity Encoder & Decoder verification · Audit standards
How to use it
- Enter text and choose encode or decode.
- Encode `&`, `<`, `>`, quotation marks and apostrophes, or decode named/numeric entities using a browser textarea.
- Read the transformed text.
Frequently asked questions
Which characters does HTML Entity Converter encode?+
Encode mode replaces only `&`, `<`, `>`, double quote and apostrophe. The first four use named entities; apostrophe becomes numeric `'`. `<a&"` becomes `<a&"`.
How does decode mode operate?+
Decode mode uses the browser textarea entity parser. Outside a DOM, fallback recognizes only `&`, `<`, `>`, `"` and `'`.
What is outside this converter’s HTML coverage?+
It is text replacement, not HTML sanitization or DOM parsing. It does not validate tags, preserve markup structure, protect against unsafe insertion, or give a security decision.
Does this converter send entered entity text to a service?+
No. Encode and decode run in the current page through string replacement or a textarea DOM value. It has no file picker, upload control, or tool request; ordinary page resources do not process the entered text.