Base64 to Decimal Converter [2025]

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Decode Base64 encoded data and interpret the result as decimal numbers. Supports URL-safe Base64, big/little endian, various number sizes, and signed/unsigned interpretation.

✓ URL-Safe Decoding✓ Byte Order Control✓ Number Size Options✓ Signed/Unsigned

Base64 Input

Decimal Output

Key Features

  • Decode Base64 strings and interpret the result as decimal numbers.
  • Supports both standard Base64 and URL-safe Base64 variations.
  • Choose between big-endian and little-endian byte order.
  • Select the number size (8-bit, 16-bit, 32-bit, 64-bit, or automatic).
  • Interpret numbers as signed or unsigned.
  • Handle Base64 data representing multiple numbers.
  • Provides clear error messages for invalid input or overflow.
  • Includes example data for quick testing and demonstration.
  • Copy the converted decimal output.

Common Use Cases

Data Analysis

  • • Extracting numerical data
  • • File format parsing
  • • Reverse engineering

Debugging

  • • Network traffic analysis
  • • Examining encoded data
  • • Low-level debugging

Development

  • • Working with binary data
  • • Encoding/decoding data
  • • System programming

Frequently Asked Questions

What is byte order (endianness)?

Byte order (endianness) refers to the order in which bytes of a multi-byte number are stored in memory or transmitted. Big-endian stores the most significant byte first, while little-endian stores the least significant byte first.

What are signed and unsigned numbers?

Unsigned numbers represent only non-negative values (0 and positive). Signed numbers can represent both positive and negative values, typically using two's complement representation.

What does "Auto" number size do?

"Auto" mode treats each decoded *byte* as a separate 8-bit number. This is useful when the Base64 represents a sequence of individual byte values.

What happens if the input is not a multiple of the number size?

If you select a fixed number size (e.g., 16-bit) and the decoded binary data's length is not a multiple of that size, an error will be thrown. This ensures data integrity.

Is my data secure?

All processing is done client-side in your browser. No data is sent to a server.

Technical Details

Number Representation

The tool uses JavaScript's built-in number handling, including `BigInt` for large numbers, to ensure accurate conversions.

Byte Order (Endianness):

  • Big-Endian: Most significant byte first (e.g., 0x1234 is stored as 12 34).
  • Little-Endian: Least significant byte first (e.g., 0x1234 is stored as 34 12).

Number Sizes Supported:

  • 8-bit (1 byte)
  • 16-bit (2 bytes)
  • 32-bit (4 bytes)
  • 64-bit (8 bytes)
  • Auto (treats each byte as an 8-bit number)

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