Limits: 3-digit octal notation (e.g. 755)
Unix Permissions Calculator
Set file permissions interactively with checkboxes, or type a numeric value. See both numeric and symbolic representations.
Permissions
ReadWriteExecute
owner
group
others
rwxr-xr-x
chmod 755 filename-rwxr-xr-xCommon Presets
About Unix Permissions Calculator
Unix Permissions Calculator converts between numeric octal notation (755, 644, 777) and symbolic notation (rwxr-xr-x) for Unix/Linux file permissions. Toggle individual read, write, and execute bits for owner, group, and others — and see the octal and symbolic representations update in real time.
Understanding file permissions is essential for Linux and macOS system administration, web server configuration, and DevOps work. chmod commands use both numeric and symbolic notation, and this tool helps you build either format quickly.
Includes explanations of what each permission set means in practice.
Features
- ✓Octal to symbolic and symbolic to octal
- ✓Toggle individual read/write/execute bits per group
- ✓Explains what each permission combination means
- ✓Common preset permissions (755, 644, 777, etc.)
Common Use Cases
- →Setting correct web server file permissions
- →Understanding chmod commands in shell scripts
- →Configuring SSH key file permissions (600)
- →Debugging permission denied errors on Linux