Base64 bit groups
01Three input bytes become four six-bit alphabet indices.
Related RFCs and changes
“Updates” changes part of an earlier RFC. “Obsoletes” replaces it. This list shows selected related documents.
DIAGRAM§ 4 ↗
RFC 4648 · § 4EXAMPLE
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03
Look up symbols
Those indices encode as TWFu.
Protocol participantThreat or exceptionProtocol controlSimplified drawings · precise section references
RFC 3548RFC 4648 §13
This revision adds the Base32 extended-hex alphabet and test vectors, among other clarifications.
Read the updated RFC section ↗Base64 uses A–Z, a–z, 0–9, +, and /.
- Base64 uses A–Z, a–z, 0–9, +, and /.
- Padding completes a final partial quantum when required.
- Encoding does not provide encryption or integrity.
Examples are illustrative. Consult the linked RFC and its errata for implementation details.
Read the RFC section ↗Diagrams simplify the RFC. Read the linked sections for complete requirements.
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