Base64 Encoder
Encode text, strings, and UTF-8 characters into standard Base64 representation.
Quick Answer & Understanding Your Result
A Base64 Encoder translates binary data or UTF-8 text into an ASCII string format using a 64-character alphabet (A-Z, a-z, 0-9, +, /) with '=' padding conforming to RFC 4648.
Mathematical Mechanism of Base64 Encoding
- 3 Bytes to 4 Characters: Every 3 binary bytes (24 bits) are divided into four 6-bit groups (index range 0 to 63).
- Data Size Overhead: Base64 encoding increases data payload size by approximately 33.3% (ratio 4/3).
- Padding Character (=): Appended when input byte length is not divisible by 3 (1 padding for 2 remainder bytes, 2 paddings for 1 remainder byte).
Standard vs URL-Safe Base64
- Standard Base64 (RFC 4648 §4): Uses
+and/with=padding for HTTP basic auth and email attachments. - URL-Safe Base64 (RFC 4648 §5): Replaces
+with-and/with_(used in JSON Web Tokens and URL parameters).
Enter your raw text or payload above to generate clean Base64 output instantly.
Formula & Calculation Logic
Technical Specification & ASTConverts UTF-8 byte streams into 6-bit index values mapped against the RFC 4648 Base64 alphabet table.
Step-by-Step Guide
Input Text or Payload
Type or paste UTF-8 text, JSON payload, or authentication credentials in the input pane.
Select Encoding Format
Choose Standard Base64 (RFC 4648 §4) or URL-Safe Base64 (RFC 4648 §5).
Review Encoded Output
Inspect character count, byte size, and overhead percentage in real time.
1-Click Copy Base64
Click 1-Click Copy for immediate use in HTTP Authorization headers, JWTs, or data URIs.
Worked Examples Table
| Example | Input Values | Calculated Result | Explanation |
|---|---|---|---|
| Encode 'Hello, World!' | 13 input bytes encoded into 16 Base64 characters with '==' padding. | ||
| Basic Auth Header Credentials | Provides instant quantitative evaluation for comparative practical analysis. |
Frequently Asked Questions
Evidence-Based Methodology & Authoritative References
IETF RFC 4648 - The Base16, Base32, and Base64 Data Encodings
MDN Web Docs - Base64 Encoding & Decoding
IETF RFC 7515 - JSON Web Signature (JWS) Base64URL Encoding
Standard: ISO / W3C / IETF Authoritative Domain Standard
Formula: Base64 Symbol = Base64AlphabetTable[(24_bit_chunk >> Shift) & 0x3F]
Last Reviewed: August 21, 2026
Primary Source: IETF RFC 4648 - The Base16, Base32, and Base64 Data Encodings
Reference Document: MDN Web Docs - Base64 Encoding & Decoding
Computation Privacy: 100% client-side 0ms computation, zero data retention
All algorithms, formatters, and data conversions run 100% locally in your browser following official technical standards (RFC, ISO, W3C). Output should be verified prior to mission-critical production deployment.
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Calculated results are modeled based on standard scientific and mathematical formulas. Please verify with domain-specific technical documentation for specialized applications.