Initialising Workbench...
A visual interactive tool to calculate and understand chmod permissions.
Every tool runs entirely in your browser. Nothing you type is uploaded, stored, or logged on our servers.
The Chmod Calculator makes managing Linux and Unix file permissions pain-free. Instead of manually adding up permission values, you can simply check the boxes for Read (4), Write (2), and Execute (1) across the Owner, Group, and Public levels.
This tool provides real-time updates for both the octal number interface (like 755 or 777) and the symbolic notation (such as -rwxr-xr-x). You can even type your target octal directly to verify what permissions it actually assigns!
It converts Unix file permissions between symbolic (rwx) and octal (like 755) notation and shows the exact chmod command for the permissions you select.
No. All permission calculations happen client-side in your browser, so nothing you enter is uploaded.
755 means the owner can read, write, and execute, while group and others can read and execute. Each digit is the sum of read (4), write (2), and execute (1).
644 grants read and write to the owner and read-only to others, typical for files, while 755 adds execute permission, typical for directories and scripts.
The calculator focuses on the standard owner, group, and others permission bits that cover the vast majority of everyday chmod use.