Chmod Calculator
Calculate Unix file permissions interactively. Toggle permissions or enter an octal value.
Read (4)
Write (2)
Execute (1)
Owner
Group
Others
Octal
000
Symbolic
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Command
chmod 000 filename
What is chmod?
chmod changes file permissions on Unix and Linux systems. Permissions are grouped by owner, group, and others. Each group can read, write, and execute.
The calculator converts between checkboxes, octal notation, symbolic notation, and a copyable chmod command.
What does chmod 755 mean?
Owner can read, write, and execute. Group and others can read and execute. This is common for directories and executable scripts.
What does chmod 644 mean?
Owner can read and write. Group and others can only read. This is common for regular files such as HTML, CSS, and images.