Why use Base64URL?
Base64URL modifies standard Base64 encoding for safe use in URL query strings, file paths, and JWT tokens. It replaces + with - and / with _, avoiding character conflicts in standard URI parsers.
Secure Base64 & Cryptographic Utilities
This toolkit was designed by Nordic Cyber Security to facilitate secure data encoding, decoding, and JWT inspection. Because traditional online tools frequently transmit sensitive credentials and payload tokens to remote backends, this application executes entirely within your browser's local sandbox.
Are JWTs verified here?
This utility inspects and deserializes JWT header and payload claims client-side. It does not attempt signature verification without your private key, safeguarding token authenticity against external disclosure.