Base64 Encoder

Create canonical Base64 in the browser and inspect size overhead without presenting encoding as encryption.

UTF-8 text0 bytes

Encoded output0 chars

—UTF-8 bytes

—Encoded chars

—Size overhead

StandardAlphabet

ReadyBase64 changes representation, not confidentiality. Anyone with the encoded value can decode it.

Trust and standards boundaries

Formatting is not schema validation, Base64 is not encryption, URL normalization is not a privacy guarantee, UUID metadata is not provenance, and decoded JWT claims are not trusted until cryptographic and application-specific validation succeeds. RS256 tools accept explicit PEM key formats and do not fetch issuer keys or make authorization decisions.

How to use this Base64 Encoder

Paste Unicode text, choose standard Base64 or Base64URL and padding behavior, then copy the encoded result. Byte and character counts make the size expansion visible.