Coder by Jean Pierre Kolb

HTML entities: & < > (optionally quotes and non-ASCII). Decoding understands all named and numeric entities.

Percent-encoding. Component for query values and path segments, Form for application/x-www-form-urlencoded (space = +), Full URL keeps :/?#&=.

Base64 with UTF-8 support. Decoding accepts URL-safe Base64, missing padding, line breaks and data URIs; binary results are shown as a hex dump and can be downloaded.

Escape text for use inside a JSON string (quotes, backslashes, line breaks, control characters) — and back.

Unicode escapes: ä, \u{1F600}, CSS \E4, HTML ä or code points U+00E4. Decoding detects all formats.

Text (UTF-8) as hexadecimal bytes — and back. Decoding ignores spaces, colons and 0x/\x prefixes.

Internationalised domain names (IDN): bücher.de ↔ xn--bcher-kva.de. Works on domains, URLs and e-mail addresses, one per line.

Quoted-Printable (RFC 2045) as used in e-mails, UTF-8, lines up to 76 characters.

Decode a JSON Web Token and check its signature. Decoding and verification run locally in your browser — the token is not sent anywhere and not stored.