Octal to HEX
Convert octal to hexadecimal — chmod-style values into byte notation.
How to use Octal to HEX
- Enter the octal value — e.g. 755 (digits 0–7 only).
- Read the hex instantly: 755 → 1ED.
- Watch the error line — an 8 or 9 anywhere in the input is named as invalid.
- Click “Copy result” — add 0x in front for most programming languages.
What is Octal to HEX?
An octal to hex converter translates base-8 values into base 16. Octal 755 is hex 1ED; octal 377 is hex FF. Because octal digits are 3 bits and hex digits are 4, the conversion works by expanding to binary and regrouping — 755 → 111 101 101 → 1 1110 1101 → 1ED — which is exactly the fiddly step this tool automates.
Practically, this is the modernization direction: octal is the legacy notation (permissions, old escape sequences), and hex is what today's debuggers, editors and specs display. Moving a value from chmod-land into byte-land is an octal → hex conversion.
About the Octal to HEX
Enter an octal value — digits 0–7 — and its hex form appears instantly, exact at any length.
Typical cases: expressing a Unix file mode as the hex constant an API wants (755 → 0x1ED), converting octal escape values from old C strings or core dumps into the hex a modern hex editor shows (\377 → 0xFF), and completing homework tables that ask for a value in all four bases. Digits 8 and 9 are flagged as invalid immediately, since they don't exist in base 8.
All conversion runs in your browser. Hex to Octal covers the reverse; Octal to Binary lets you see the 3-bit expansion that powers the regrouping.