Octal to binary converter

We accept 0-7 with optional 0o prefix and blanks or underscores as separators. The value is cleaned before converting.

Each octal digit becomes a 3-bit block and then all blocks are concatenated. You can regroup the final output into 4 or 8-bit chunks for readability.

Alongside binary you also get decimal and hexadecimal equivalents. Quick links let you jump to the other converters with the same clean layout.

We rely on BigInt in the browser to support long strings without losing precision. The practical limit is your device.

Convert octal to binary using 3 bits per digit, with configurable grouping. Shows decimal and hexadecimal plus a per-digit step table.

Octal to binary calculator online

Convert octal to binary in real time, regroup the output in 3/4/8 bits, see the per-digit equivalence and jump to other base converters.

Octal (0-7, supports 0o, spaces or _)

—

—

Group in 3/4/8-bit blocks for readability

—

—

Octal digit	Binary equivalent	Detail

What input formats are accepted?

How is the binary string built?

What other bases are shown?

Is there a size limit?