What does chmod 755 mean?

chmod 755 means the owner has full permissions (read+write+execute = 7), while group and others have read+execute permissions (5). This is the most common permission for directories and executable scripts.

What is the difference between octal and symbolic notation?

Octal notation uses numbers (e.g., 755), where each digit represents permissions for owner, group, and others. Symbolic notation uses letters (e.g., rwxr-xr-x) where r=read, w=write, x=execute.

What are the most commonly used chmod permissions?

The most common: 644 (files readable by all, writable by owner), 755 (directories/scripts executable by all), 600 (private files, owner only), 700 (private directories, owner only).

chmod Calculator

Calculate Linux file permissions in octal and symbolic notation. Visual chmod command generator.

tools.chmodCalculator.permissions

tools.chmodCalculator.octalInput

tools.chmodCalculator.octalNotation

755

tools.chmodCalculator.symbolicNotation

rwxr-xr-x

Command

chmod 755 filename

tools.chmodCalculator.commonPresets

How to Use

Calculate Linux file permissions in octal and symbolic notation. Visual chmod command generator.

1Check the permission boxes for Owner, Group, and Others.
2View the octal (e.g., 755) and symbolic (e.g., rwxr-xr-x) notation.
3Or enter an octal number to auto-fill the checkboxes.
4Copy the chmod command to use in your terminal.

Key Features

Visual permission grid with instant calculation
Octal and symbolic notation display
Reverse lookup — enter octal to see permissions
Common presets: 644, 755, 777, 600, 700

Frequently Asked Questions

Learn More

Linux File Permissions and chmod Command — Complete Guide

	Read	Write	Execute	Octal
Owner				7
Group				5
Others				5