About This Converter
Convert octal numbers to binary by expanding each octal digit into its 3-bit binary equivalent. Enter any octal value like 755 and see the binary result with each digit-to-bits expansion shown. The reverse of grouping — each octal digit becomes exactly 3 binary bits.
Worked Examples
Octal: 377 → Binary: 11111111
3=011, 7=111, 7=111 → 011111111 → 11111111
Octal: 755 → Binary: 111101101
7=111, 5=101, 5=101 → 111101101
Octal: 12 → Binary: 1010
1=001, 2=010 → 001010 → 1010
Need More Bases?
For full multi-base conversion (binary, octal, decimal, and hex all at once), use our Number System Converter — it shows all four representations simultaneously with complete step-by-step working.