What does chmod 755 mean?

Owner can read, write, execute. Group and others can read and execute. This is the standard permission for directories and executable scripts.

What does chmod 644 mean?

Owner can read and write. Group and others can only read. Standard for regular files like HTML, CSS, images.

What's the difference between numeric and symbolic?

Numeric (755) uses octal digits. Symbolic (rwxr-xr-x) uses letters. They represent the same permissions in different formats.

Chmod Calculator

Calculate Unix chmod file permissions. Convert between symbolic and numeric notation.

Presets

Numeric

755

Symbolic

rwxr-xr-x

Command

chmod 755 filename

Frequently asked questions

Chmod Calculator — Unix File Permissions Online Free

Calculate Unix file permissions with our interactive chmod calculator. Toggle read, write, execute for owner, group, and others. See both numeric (octal) and symbolic notation.

Interactive toggles

Click to toggle read, write, execute for each category.

Dual format

See both numeric (755) and symbolic (rwxr-xr-x) representations.

Common presets

Quick buttons for 644, 755, 777, and other common permissions.

	Read	Write	Execute
Owner
Group
Others