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Base64 URL-Safe Encoder & Decoder (RFC 4648)

Encode and decode URL-safe Base64 strings replacing plus and slash characters with hyphens and underscores.

RFC 4648 replaces '+' with '-' and '/' with '_', stripping '=' padding for safe URL query strings and JWT tokens.

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Standard Base64 contains '+' and '/' which require URL encoding in query parameters; URL-safe uses '-' and '_'.

Yes, trailing '=' padding characters are removed according to RFC 4648.

Yes, JWT headers and payloads use URL-safe Base64 encoding.