Encoding & Decoding
Tools for converting data between encoding formats: Base64 for attachments and APIs, percent encoding for URLs, HTML entities for safe character display, a JWT decoder for debugging authentication, plus the classic ROT13 and Morse ciphers. Decoding happens locally, so tokens and sensitive strings never leave your computer.
10 tools
In this category
Base64 Encode / Decode
Encode text to Base64 or decode Base64 strings with full Unicode support
URL Encode / Decode
Encode and decode URLs with full or component encoding modes
Encoding Detector
Detect text and file encoding online: UTF-8, UTF-16, ASCII, Windows-1251, KOI8-R. Confidence score, byte details and a side-by-side preview of how the text looks in each candidate encoding
HTML Entity Encode / Decode
Encode and decode HTML entities like < > & "
JWT Token Decoder
Decode JWT tokens to view header, payload, and signature as formatted JSON
ROT13 Cipher
Encode or decode text using the ROT13 substitution cipher
Morse Code Translator
Convert text to Morse code and back with visual representation and audio playback
Binary Translator
Convert text to binary (0s and 1s) and back with byte-level breakdown
Base64 Image Encoder
Convert images to Base64 data URIs and back with drag & drop, file size comparison, and CSS/HTML copy
Punycode Converter
Convert internationalized domain names (IDN) to Punycode and back with batch conversion support
Developers reach for these utilities daily: quickly inspect a JWT payload, decode a string from logs, or prepare a data-URI for an image.