Convert a Hex Number to Octal Number

The same number can be written in any base. Octal uses base-8 digits 0-7; Hex uses base-16 digits 0-9A-F. Converting between them is a change of notation, not of value - and when computers favour one base while human eyes favour another, Hex-to-Octal conversion becomes a daily habit.

Convert a Hex Number to Octal Number Converter reads any hexadecimal number and writes the identical value in octal. BigInt keeps every conversion exact at any size, batches run up to 1000 values per click, and the list copies or downloads one line each.

• Exact BigInt: Every conversion exact at any size.
• Base-8 output: Clean octal digit strings.
• Input validation: Invalid hexadecimal flagged per line.
• Batch mode: Up to 1000 conversions at once.
• Readable digits: Octal output as typed.
• Copy or download: Export all results.

1. Enter hexadecimal numbers - one per line, digits 0-9A-F only.
2. Generate - BigInt conversion runs on every line.
3. Read the octal results - each paired with its input.
4. Copy or download - the converted list.

1. A, FF, 400, 64: converted to Octal as A -> A; FF -> FF; 400 -> 400; 64 -> 64 - every row exact.

2. A: the same quantity written in base 8, the octal answer.

3. Zero and one: 0 and 1 map to 0 and 1 in every base - the universal anchors.

4. A large value: feed a long hexadecimal string and BigInt keeps every digit of the octal result exact.

5. Batch: paste several hexadecimal values and each row returns its own octal form.

• Notation, not maths: The value never changes - only its spelling.
• Zero loss: BigInt keeps huge hexadecimal inputs exact.
• Batch friendly: Hundreds of conversions per run.
• Self-validating: Bad hexadecimal digits flagged per line.
• Copy or download: Results export in one click.
• Private and free: Everything runs in the browser; nothing is uploaded or logged.