Chmod Permissions Calculator
Calculate Unix file permissions, octal numbers & symbolic notation
About Chmod Permissions Calculator
How Chmod Permissions Calculator Works
Calculates POSIX standard file system permission bitmasks across Owner, Group, and Others roles. Computes octal representation (4 for read, 2 for write, 1 for execute) and symbolic notation (-rwxr-xr-x) in real time with 0 network latency.
Chmod Permissions Calculator provides an interactive visual matrix for calculating Unix file and directory permissions. Toggle Owner, Group, and Others permissions to instantly generate octal notation (755, 644), symbolic strings (rwxr-xr-x), and terminal commands.
Frequently asked questions
What does chmod 755 mean?+
755 gives the owner read, write, and execute permissions (7), while group members and others can only read and execute (5). Standard for executable scripts and web directories.
What does chmod 644 mean?+
644 gives the owner read and write permissions (6), while everyone else can only read (4). Standard for public HTML, CSS, and image files.
What are Setuid, Setgid, and Sticky bits?+
Special permission bits (4000, 2000, 1000) that grant elevated execution privileges or restrict file deletion in shared folders (like /tmp).
Limitations
Applies standard POSIX Linux/Unix permissions; advanced Access Control Lists (ACLs) are not configured.