Chmod Permissions Calculator

The owner can read, write and execute (7), while the group and others can read and execute but not write (5). It is the usual mode for directories and runnable scripts.

The owner can read and write (6), while the group and others can only read (4). It is the typical mode for regular files like HTML, images and config files.

They describe the same thing two ways. Octal uses three digits (each 0-7) where read is 4, write is 2 and execute is 1. Symbolic spells the bits out as nine characters such as rwxr-xr-x.

Read lets you view a file or list a directory, write lets you change a file or add and remove files in a directory, and execute lets you run a file or enter a directory.

A fourth, leading digit sets the special bits: 4 is setuid, 2 is setgid and 1 is the sticky bit. This calculator focuses on the standard read, write and execute bits and ignores that special digit.

No. The conversion is plain arithmetic that runs entirely in your browser, so nothing you type is uploaded anywhere.