Octal to Binary Converter

Convert any octal number to binary instantly — each digit becomes 3 bits. Free, fast, no sign-up.

How to convert octal to binary

  1. Write down the octal number.
  2. Replace each octal digit with its 3-bit binary form (0=000 … 7=111).
  3. Join the groups — that's your binary number (drop leading zeros).

Example: 175₈ → 1 7 5 → 001 111 101 → 1111101₂.

Frequently asked questions

How do I convert octal to binary?

Replace each octal digit with 3 binary bits and join them together.

What is 17 in binary?

17₈ = 1111₂.

Do I keep leading zeros?

No — drop leading zeros from the final answer, e.g. 001 111 becomes 1111.

Need the reverse? Try our binary to octal converter.

More converters

Binary to Decimal Decimal to Binary Hex to Decimal Decimal to Hex Text to Binary Binary to Text Blog Octal to Decimal Decimal to Octal Binary to Octal Octal to Binary ASCII Table Base64 Encode Base64 Decode