Octal converter

Octal Converter — Convert Between Octal and Other Number Bases

Convert octal (base-8) numbers to decimal, binary, and hexadecimal online. Octal notation is used primarily in Unix/Linux file permission modes (chmod), assembly language, and early computing systems. Convert octal permission values like 755, 644, and 777 to understand their binary representation and decimal equivalents.

Octal Conversion Applications

• Unix/Linux file permission (chmod) analysis and conversion
• Assembly language and microcontroller programming
• Legacy system compatibility and migration
• Educational study of number systems
• C/C++ octal literal interpretation (prefix 0)
• Embedded system configuration register analysis

Octal numbers are most commonly encountered in Unix file permissions — chmod 755 means owner has read/write/execute (7=111 in binary), group has read/execute (5=101), others have read/execute (5=101). This tool converts any octal value to decimal, binary, and hex for easy interpretation. Essential for system administrators, DevOps engineers, and developers working with Unix permissions and legacy systems.