Base64 Encode – Online Encoder

Convert any text or binary file to Base64 format. Base64 is widely used for transmitting binary data over text‑based protocols like email or embedding images in HTML/CSS.

How Base64 Works

Base64 takes 3 bytes (24 bits) and splits them into 4 groups of 6 bits, each mapped to a character from the set A-Z a-z 0-9 + /. Padding (=) is added if the last group has fewer than 3 bytes.

Example Encoding

Input text: "Hello"
UTF-8 bytes: 48 65 6c 6c 6f
Base64: SGVsbG8=
Input text: "Hello World"
Base64: SGVsbG8gV29ybGQ=

Code Example

// Python
import base64
text = "Hello World"
encoded = base64.b64encode(text.encode()).decode()
print(encoded)  # SGVsbG8gV29ybGQ=

// JavaScript (Node.js)
const encoded = Buffer.from("Hello World").toString("base64");
console.log(encoded);  // SGVsbG8gV29ybGQ=

Advanced Options

• Line wrapping: insert line breaks every 76 chars (MIME)
• Padding: include or omit trailing '='
• Input format: text, binary file, or hex string

Use Cases

• Embed images in HTML/CSS as data URLs
• Encode binary attachments for email (MIME)
• Store binary data in JSON or XML
• JWT token payload (but use Base64URL variant)