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Every interpretation derived from the same input.
Enter a hex value above to see every conversion.
Octal groups bits by three. Hex groups by four. Going from hex to octal goes through binary internally so the bit pattern is preserved exactly.
Convert hex → BigInt → base-8 string. The tool uses native BigInt toString so very long inputs round-trip without precision loss.
Convert hexadecimal values into base-8 octal. Octal is still common for Unix permissions, file format flags, and historic hardware documentation.
1A3F.Octal groups bits by three. Hex groups by four. Going from hex to octal goes through binary internally so the bit pattern is preserved exactly.
Convert hex → BigInt → base-8 string. The tool uses native BigInt toString so very long inputs round-trip without precision loss.
Need other directions? Try the Decimal to Hex, Binary to Hex, or Text to Binary tools.
Why does Unix love octal?
Three permission bits (rwx) fit one octal digit. 755 maps directly to rwx-rx-rx.
Who still uses octal in 2026?
Sysadmins, Docker users, and anyone editing chmod or umask values.
When is octal more readable than hex?
When the value represents three-bit groups (like permissions) rather than byte-level data.
Where do leading zeros come from in C?
C parses 0755 as octal. The tool drops leading zeros for cleanliness — re-add them in your code if needed.
What if my input is shorter than a byte?
Short hex inputs convert just fine; the BigInt conversion is base-only, no padding required.
How do I copy without spaces or commas?
Octal output never inserts separators. Just click the copy button on the Octal cell.