Base64 Decode JWT Token Parts
Quick Answer: JWT tokens consist of three Base64url-encoded segments separated by dots. Paste an individual segment (not the full JWT) to decode it to readable JSON. The first segment is the header (algorithm), the second is the payload (claims).
FAQ
Can I decode a full JWT here?
This tool decodes a single Base64url segment. For full JWT decoding (header + payload + signature check), use the JWT Decoder tool instead.
Why is JWT Base64 different from standard Base64?
JWT uses Base64url encoding: + is replaced with -, / with _, and = padding is removed. This makes the encoded string safe for URLs.