Base64 Encoder / Decoder
Standard base64 (RFC 4648 §4) and URL-safe (§5) variants. Encodes UTF-8 input correctly; decodes attempts to render UTF-8 text and falls back to a hex view if it isn’t printable.
Input
Result
Type something to convert.
All conversion runs locally.
When to use which variant
Standard base64 uses + and /; URL-safe replaces them with - and _ and drops trailing = padding. URL-safe is what FIDO2 / WebAuthn / JWT use.
Spec
RFC 4648 (base64 / base64url).