Octal to Binary Converter — Online & Free

Convert base-8 octal digits (0-7) to base-2 binary strings instantly.

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Convert Octal numbers to Binary strings

This tool converts any base-8 octal number back to its base-2 binary representation. Each octal digit maps to three binary bits.

How to Convert

  1. Type an octal number (using digits 0-7) in the input.
  2. View the live binary bit representation.
  3. Copy the binary output.

About this Conversion

Octal numbers are converted to binary by converting each digit to its 3-digit binary equivalent (e.g. 7 -> 111, 4 -> 100, 0 -> 000).

Frequently Asked Questions

What happens if I enter an 8 or 9?

Octal only supports digits from 0 to 7. Entering an 8 or 9 will trigger an invalid input error.