Visual Linux Chmod Permissions Calculator
Calculate Unix file permissions visually with read, write, execute checkboxes and octal codes.
About This Tool
Linux Chmod Permissions Calculator helps system administrators and developers calculate and understand Unix/Linux file permissions with octal numbers (e.g. 755), symbolic strings (rwxr-xr-x), and executable commands.
Key Features
Interactive 3x3 permission matrix
One-click standard presets (755, 644, 777, 600, 700, 400)
Instant octal (755) and symbolic (-rwxr-xr-x) calculation
Customizable copyable terminal command
How to Use This Tool
- Check or uncheck Read, Write, and Execute boxes for Owner, Group, and Public.
- Or click a quick preset like 755, 644, or 600.
- Enter your target filename and copy the generated chmod command.
Why Use This Tool
- Eliminates guesswork when configuring server and script permissions.
- Provides instant octal and symbolic permission representations.
- Includes standard secure server presets (644 web files, 600 SSH keys).
Pro Tips
- Never use 777 in production environments as it allows anyone to modify and execute your files
- Use 644 for static web files and 755 for directories and executable scripts
Frequently Asked Questions
What does chmod 755 mean?
755 gives the Owner full read/write/execute permissions (7), while Group and Public have read and execute permissions (5).
What permission should SSH private keys have?
SSH private keys must be set to 600 (read/write for Owner only) or 400 (read-only for Owner).