Base64 Decode to String or Bytes Online

Base64 Decoder

This free and open-source tool allows you to easily decode Base64-encoded text back to its original format. Base64 is a binary-to-text encoding scheme commonly used to represent binary data in an ASCII string format.

What is Base64 Decoding?

Base64 decoding is the process of converting Base64-encoded text back to its original form. It reverses the Base64 encoding process, transforming the 64-character set (A-Z, a-z, 0-9, + and /) back into the original data.

How to Use

  1. Enter or paste your Base64-encoded text into the input box.
  2. The tool will automatically decode the input and display the result in the output box.
  3. Click the "Copy" button to copy the decoded text to your clipboard.

Features

  • Real-time Base64 decoding
  • Support for standard Base64 input
  • One-click copy to clipboard
  • Clear button to reset input and output

Use Cases

  • Decoding Base64-encoded data received from APIs or other systems
  • Retrieving original content from Base64-encoded strings in databases
  • Decoding Base64-encoded email attachments
  • Recovering original text from Base64-obfuscated data

How It Works

The decoder processes the input by:

  1. Grouping the Base64 characters into sets of four
  2. Converting each group to its 24-bit binary representation
  3. Splitting the binary data into 8-bit chunks
  4. Converting each 8-bit chunk back to its corresponding ASCII character

Privacy and Security

This tool performs all decoding operations directly in your browser. No data is sent to any external server, ensuring that your information remains private and secure.

Note

While Base64 can obfuscate data, it is not a form of encryption. Sensitive information should not be protected solely by Base64 encoding.