Base64URL
URL-safe Base64 encoding used in JWTs. Replaces +/ with -_ and omits padding. Not encryption — anyone can decode.
Quick Answer
See our full JWT Glossary for related terms, or use the JWT Decoder to inspect tokens in practice.
What is Base64URL?
URL-safe Base64 encoding used in JWTs. Replaces +/ with -_ and omits padding. Not encryption — anyone can decode.
See It in Practice
Paste any JWT into our JWT Decoder to see related claims in action. Use the JWT Debugger for detailed analysis.
Related
Browse the full JWT Glossary or explore JWT Basics.
Base64URL in JWT Authentication
Understanding Base64URL helps you read RFC 7519, debug tokens, and design secure authentication. JWTs combine header, payload claims, and a cryptographic signature.
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