Hexadecimal to Octal Converter
Convert hexadecimal numbers to octal representation online. Free, fast, and runs entirely in your browser.
Input
Output
What Is Hexadecimal to Octal Conversion?
Hexadecimal to octal conversion transforms numbers from the base-16 (hexadecimal) <a href="https://en.wikipedia.org/wiki/Numeral_system" target="_blank" rel="noopener">numeral system</a> into the base-8 (octal) numeral system. Hexadecimal uses digits 0-9 and letters A-F, while octal uses only digits 0-7 to represent values.
Both hexadecimal and octal are commonly used in computing. Hexadecimal is widely used for memory addresses and color codes, while octal is used in Unix file permissions and some legacy systems, as referenced in the <a href="https://www.kernel.org/doc/html/latest/process/coding-style.html" target="_blank" rel="noopener">Linux kernel coding style guide</a>. This tool converts hex values to their octal equivalents instantly.
How to Use This Tool
Enter Hexadecimal Numbers
Type or paste one hexadecimal number per line in the left editor. You can also click Sample to load example values, or Upload a text file. The tool accepts values with or without the 0x or # prefix.
View Octal Output
The right panel updates automatically with the octal representation of each hexadecimal number.
Copy or Download
Click Copy to copy the octal output to your clipboard, or Download to save it as a text file.
Conversion Examples
Here are some common hexadecimal to octal conversions:
Hexadecimal Input
Octal Output
Frequently Asked Questions
How does hexadecimal to octal conversion work?
The conversion works by first converting the hexadecimal number to its decimal (base-10) equivalent, and then converting that decimal value to octal. For example, hex FF equals decimal 255, which equals octal 377. Hexadecimal is also used extensively in Git object hashes.
Does this tool support the 0x prefix?
Yes. The tool automatically strips the 0x and # prefixes before converting. You can enter values like 0xFF, #FF, or just FF.
Is my data sent to a server?
No. All processing happens locally in your browser. No data leaves your machine.
Does it support negative numbers?
Yes. Negative hexadecimal numbers produce an octal result prefixed with a minus sign (e.g., -FF becomes -377). Hexadecimal is also used in network protocols like IPv6 addressing (RFC 4291).
Related Tools
Learn more: Hexadecimal in networking, ScienceDirect on octal numbers, and the Wikipedia article on octal.