HTML Encode Decode
Use the fields above to transform, validate, or format input. Errors appear in the on-page alert when parsing fails.
HTML encode / decode
How it works
Parsing and encoding run entirely in JavaScript here—no server sees your pasted content unless a tool explicitly says it fetches remote data.
Edge cases
- Hidden whitespace or BOM characters can break otherwise valid input.
- Line-ending differences (LF vs CRLF) may affect strict comparisons.
- Large payloads are best tested in chunks to isolate the failing part.
Use this tool for
- Formatting or minifying snippets before pasting into a repo or ticket.
- Checking encodings (Base64, hex, URL) without third-party paste services.
- One-off developer checks during debugging.
Common questions
Which inputs matter most for HTML Encode Decode?
Confirm the field units (px, degrees, charset) match what you intend; mixed bases are the usual surprise on this kind of tool.
