Base64 Encoder & Decoder Online

Convert text to Base64 encoded format or decode Base64 data back to plain text. Perfect for data transmission, web development, and API integration.

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About Base64 Encoding & Decoding

What is Base64?

Base64 is an encoding scheme that converts binary data into ASCII text format using 64 printable characters. It's designed to carry data in environments that can only handle text safely.

How it Works

  • • Uses 64 characters: A-Z, a-z, 0-9, +, /
  • • Groups input into 3-byte chunks
  • • Converts to 4 Base64 characters
  • • Adds padding (=) if needed

Common Use Cases

  • • Email attachments (MIME encoding)
  • • Embedding images in HTML/CSS
  • • API data transmission
  • • Data URLs in web applications
  • • Authentication tokens
  • • Binary data storage in text formats

Features

  • • Real-time encoding/decoding
  • • Format validation for Base64
  • • File upload support
  • • Quick switch between modes
  • • Size comparison display
  • • Unicode text support