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Octal to Binary Converter

Input
Output (Binary)
Go To Full Number Base Converter

Convert octal integers (base 8) into their exact binary equivalents (base 2). This variant is locked to batch mode, allowing you to paste multiple octal values separated by newlines to get an instant line-by-line binary translation.

Supported octal formats

The converter accepts standard octal characters (0-7). You can optionally include 0o prefixes, and any spaces or underscores in the input will be automatically ignored. Signed values are fully supported by adding a leading + or -.

Error handling

Each line is evaluated individually. If a line contains invalid characters—such as digits 8 or 9, or letters—that specific line will display an error message while the rest of your batch finishes processing normally.

This allows you to convert extremely large octal numbers without worrying about floating-point rounding errors or typical 64-bit bounds.

Frequently Asked Questions

Yes. Use a leading minus sign (−) or plus sign (+). The sign is preserved in the binary output.

Yes. This variant runs in batch mode by default: paste one octal integer per line and get one binary result per line.

Yes. Inputs like 0o755 are accepted in this variant.

Yes. Spaces and underscores are ignored, so values like 7_55 or 0o7 55 work.

Each octal digit maps exactly to 3 binary bits, so octal is a compact, binary-friendly representation.

Try one of our format-specific converters below

Full Number Base Converter tool

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