Base64URL Encoder / Decoder
Encode or decode URL-safe Base64 (Base64URL).
Mode
Base64URL Output
Base64 vs. Base64URL
Standard Base64 uses +, /, and = padding, which must be percent-encoded inside URLs. Base64URL (RFC 4648 §5) swaps + → - and / → _and drops the padding, so the result is safe in URLs and filenames. It's what JSON Web Tokens use. Conversion runs locally over the UTF-8 bytes of your text.
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