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Base64 Encoder

Encode and decode Base64 text

Mode:

Input (Plain)

Characters:0
Lines:1

Options

0 (no breaks)76 (RFC 2045)256

Output (Base64)

Characters:0
Size ratio:N/A

About Base64 Encoding

Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format.

Common Use Cases:

  • • Embedding images in HTML/CSS (Data URIs)
  • • Transmitting binary data over text-based protocols
  • • Storing complex data in JSON or XML
  • • Email attachments (MIME encoding)
  • • API authentication tokens

Encoding Details:

  • • Uses 64 characters: A-Z, a-z, 0-9, +, /
  • • Padding with = for alignment
  • • Increases data size by ~33%
  • • URL-safe variant replaces +/ with -_

Frequently Asked Questions

What is Base64 encoding?

Base64 is an encoding scheme that converts binary data into ASCII text format. It uses 64 characters (A-Z, a-z, 0-9, +, /) to represent data, making it safe to transmit over text-based protocols like email or JSON.

When should I use Base64 encoding?

Use Base64 when you need to embed binary data (like images) in text formats (HTML, CSS, JSON), transmit data over protocols that only support text, or encode credentials for HTTP Basic Authentication.

Is Base64 encryption?

No, Base64 is NOT encryption. It's an encoding method that can be easily reversed (decoded). Anyone can decode Base64 data. Never use Base64 alone to protect sensitive information - use proper encryption instead.

Related guide

Base64 Encoding Explained: What It Is and When to Use It