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Octal to Hex Converter
Convert octal integers to hexadecimal integers in your browser with explicit ASCII, Unicode code point, and UTF-8 byte handling.
Interactive tool
Convert octal integers to hexadecimal integers
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Choose the exact representation you need; the tool does not guess an encoding.
Detailed conversion guide
How to Convert Octal to Hex
Octal groups values in three binary bits, while hexadecimal groups four. Converting the exact integer bridges those group sizes without rounding; octal 755 becomes hex 1ED.
BigInt keeps long values exact. Output can be uppercase, lowercase, or explicitly prefixed with 0x for code and configuration files.
| Input | Output | Meaning |
|---|---|---|
7 | 7 | single digit |
10 | 8 | base boundary |
377 | FF | one byte |
755 | 1ED | permission value |
Octal to Hex with BigInt
After strict octal validation, construct BigInt from a 0o-prefixed value and render with toString(16). Apply casing or a 0x prefix only after conversion.
// validate first, then convert
const value = Number.parseInt(token, radix);
if (!Number.isInteger(value)) throw new Error("Invalid input");Base-8 Validation and Hex Formatting
Output casing changes presentation, not value. A 0x prefix documents the target base but is not part of the hexadecimal digits.
The tool handles unsigned integers only and rejects 8, 9, signs, fractions, or ambiguous free-form text instead of guessing.
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