Chmod Permissions Calculator
Calculate Linux file permissions in octal (755, 644, 600) and symbolic format with an interactive User, Group, and Public permission matrix.
755
-rwxr-xr-x
Interactive Permission Checkboxes
User / Owner
Group
Public / Others
Understand Linux File Permissions (Chmod)
In Unix-like operating systems (Linux, macOS, BSD), file access is governed by three distinct permission tiers: Owner (User), Group, and Others (Public).
Each tier combines three numeric values: Read (4), Write (2), and Execute (1). For example, full access (4+2+1 = 7) for owner and read/execute (4+0+1 = 5) for others produces chmod 755.
How to Use Chmod Permissions Calculator (Step-by-Step)
Check or uncheck the Read (r), Write (w), and Execute (x) boxes for Owner, Group, and Other.
View the updated numeric code (e.g. 755) and symbolic notation (rwxr-xr-x).
Copy the generated chmod command for quick terminal execution.
Applications
Common Use Cases
- Generate chmod commands for web servers (e.g. 755 for directories, 644 for files).
- Decode numeric octal permissions into read, write, and execute rights.
- Set proper security permissions for SSH keys (chmod 600 or 400).
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Linux File Permissions (chmod) Explained: Octal vs Symbolic Calculator
A practical Unix/Linux permissions guide. Learn what octal numbers mean for User, Group, and Others, with visual calculation tables.
FAQ
Frequently Asked Questions
What is the recommended permission for SSH private keys?
SSH private keys should typically be set to 600 (read/write for owner only) or 400 (read-only for owner).