Base64 Tools

Base64 Inspector

Check what a Base64 string actually contains without assuming that readable-looking encoded text is encrypted or trusted.

Base64 or Base64URL

—Variant

—Encoded chars

—Decoded bytes

—Encoded overhead

ReadyBase64 commonly expands binary data because every output character represents 6 bits. Whitespace is excluded from the encoded-character count here.

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.