What is Base64URL decoding?
It restores original data from URL-safe Base64 encoding.
Tool workspace
Decode Base64URL strings instantly online. Convert URL-safe Base64 encoding back into readable data.
Output
Base64URL Decoder converts URL-safe Base64 encoded strings back into their original form. This encoding format is commonly used in JWT tokens and web APIs where data must safely travel within URLs.
Input
aHR0cHM6Ly9hcGkuZXhhbXBsZS5jb20vYXV0aD90b2tlbj1kWE5sY2w5cFpEMDNOREl4Sm5OamIzQmxQWEpsWVdSZmQzSnBkR1U
Output
https://api.example.com/auth?token=dXNlcl9pZD03NDIxJnNjb3BlPXJlYWRfd3JpdGU
Base64URL decoding converts URL-safe Base64 characters back into their original binary or text representation.
It restores original data from URL-safe Base64 encoding.
In JWT tokens and web APIs.
No it is encoding only.
Yes invalid Base64URL strings cannot be decoded.
No it simply restores the original value.
Yes everything runs locally in your browser.