Chmod Calculator
Calculate Unix file permissions in numeric and symbolic notation. Visual interface with checkboxes, presets, and reverse lookup.
owner
group
others
755
rwxr-xr-x
chmod 755 filename
How to Use
- 1
Set permissions
Use the checkboxes to set read, write, and execute permissions for Owner, Group, and Others.
- 2
View outputs
See the numeric notation (e.g., 755), symbolic notation (e.g., rwxr-xr-x), and chmod command automatically generated.
- 3
Use presets or reverse lookup
Click a preset button to apply common permissions, or enter a numeric value to update the checkboxes.
- 4
Copy command
Copy the chmod command to use in your terminal.
Chmod (change mode) is a Unix command that sets file permissions. Permissions control who can read, write, or execute a file. The numeric notation uses octal values (0-7) for each permission group.
- •Setting web server file permissions
- •Securing private keys (400 or 600)
- •Making scripts executable
- •Troubleshooting permission denied errors
- •Configuring deployment permissions