Encode / Decode
Encode and decode data across common formats — JWT, Base64, URL, HTML entities, and more. Every tool runs entirely in your browser.
8 toolsEncode / Decode Base64
Base64 Encode / Decode
Encode or decode Base64 text with standard and URL-safe variants
Encode / Decode URL
URL Encode / Decode
Percent-encode or decode URL text with component and full-URL modes
Encode / Decode HTML entities
HTML Entity Encode / Decode
Encode or decode HTML character references with WHATWG-named, decimal, and hex output
Inspect Unicode
Unicode Inspector
Inspect code points, UTF-8 bytes, names, category, script, and East Asian width
Hex encode / decode
Hex ↔ ASCII / UTF-8
Convert UTF-8 text to hex bytes or hex dumps back to readable text
ROT13 / Caesar shift
ROT13 / Caesar Cipher
ROT13 spoilers or Caesar-shift A–Z and a–z with encrypt and decrypt modes
Punycode / IDN
Punycode / IDN
Convert internationalized domain names and emails between Unicode and ASCII xn-- form
Decode JWT
JWT Decoder
Decode JWT tokens and inspect claims, expiry, and algorithm