Convert integers between binary, octal, decimal, hex and base36 of any size.
Encode text or files to Base64 (or a data: URI), and decode Base64 back to text or a file.
Percent-encode and decode text, or break a URL into its parts and query parameters.
Escape text for safe use in HTML, or turn entities back into characters.
Decode a JSON Web Token's header and claims and explain its lifetime. The signature is not verified.
Fibonacci ToolBox runs its tools from your browser session and needs JavaScript.