Chmod Calculator
Calculate Unix/Linux file permissions interactively. Toggle permission bits, see octal and symbolic notation, and get the chmod command.
chmod 755 filenameCommon Permissions
How Unix File Permissions Work
Unix file permissions control who can read, write, or execute a file. Permissions are set for three roles: the file owner, the group, and all other users. Each role can have read (r=4), write (w=2), and execute (x=1) permissions.
Octal vs Symbolic Notation
Octal notation uses three digits (e.g., 755) where each digit is the sum of permission values (r=4, w=2, x=1). Symbolic notation uses letters (e.g., rwxr-xr-x). Both represent the same permissions.
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Disclaimer: This tool is provided as-is for informational and educational purposes only.