HEX to Octal
Convert hexadecimal to octal — base 16 to base 8 through clean binary.
How to use HEX to Octal
- Enter the hex value — e.g. 1ED (case doesn't matter, drop any 0x prefix).
- Read the octal instantly: 1ED → 755.
- Convert several values at once by separating them with spaces.
- Click “Copy result” — prefix with 0o or a leading 0 as your language requires.
What is HEX to Octal?
A hex to octal converter translates between the two compact bases programmers use: base 16 down to base 8. Hex FF is octal 377; hex 1ED is octal 755. There is no digit-for-digit shortcut between them — hex digits are 4 bits and octal digits are 3, and 4 and 3 don't align — so the honest route is hex → binary → regroup in threes → octal.
That regrouping is fiddly to do by hand (expand FF to 11111111, split as 11 111 111, pad, read 377), which is why a converter beats mental math the moment values get longer than a byte.
About the HEX to Octal
Enter a hex value and its octal equivalent appears instantly — the binary regrouping happens internally and exactly, at any length.
When you need it: translating a file mode you have in hex (0x1ED) into the chmod octal every Unix tool expects (755), converting byte values between a hex dump and an octal-speaking legacy format or escape sequence (hex 41 → octal 101 → \101 → the letter A), and cross-checking number-systems homework that asks for both notations.
Case-insensitive input, invalid digits flagged by token, all in your browser. Octal to Hex runs the reverse; Hex to Binary shows the intermediate bit pattern if you want to see the regrouping yourself.