Chmod Calculator
Calculate Unix/Linux file permissions
Octal
755
Symbolic
rwxr-xr-x
chmod command
chmod 755 filename
What is Chmod?
Chmod (change mode) is a Unix/Linux command that sets file and directory permissions. Permissions control who can read, write, or execute a file — for the owner, group, and others. This calculator lets you toggle permission bits visually and instantly shows the octal notation (e.g. 755) and symbolic notation (e.g. rwxr-xr-x) used with the chmod command.
How to Use the Chmod Calculator
- Toggle the read, write, and execute checkboxes for Owner, Group, and Others
- The octal value and symbolic notation update instantly
- Copy the octal value or the full chmod command
- Run the command in your terminal: chmod 755 filename
Chmod Calculator Features
- Visual permission toggle for owner, group, and others
- Instant octal notation (e.g. 755, 644)
- Symbolic notation (e.g. rwxr-xr-x)
- Ready-to-run chmod command output
- Common permission presets for quick reference
Chmod Calculator FAQ
What does 755 mean?
755 means the owner has read+write+execute (7), and group and others have read+execute (5). Common for directories and executable scripts.
What does 644 mean?
644 means the owner has read+write (6), and group and others have read-only (4). Common for regular files.
What is the difference between 755 and 777?
777 gives everyone full read+write+execute permissions, which is a security risk. 755 restricts write access to the owner only.