Chmod Calculator - Free Online Tool | PivaBox

Calculate Unix file permissions with visual checkbox selection and numeric output

How to Use Chmod Calculator

1. Toggle the permission checkboxes for Owner, Group, and Others across Read, Write, and Execute
2. The numeric (e.g., 755), symbolic (e.g., rwxr-xr-x), and binary representations update instantly
3. Copy the permission string for use in your terminal or deployment scripts

Frequently Asked Questions

Is Chmod Calculator free?

Yes, PivaBox Chmod Calculator is completely free to use. All calculations are done locally.

Are my permission settings uploaded to a server?

No. All permission calculations are done locally in your browser. Nothing is uploaded to any server.

What do chmod numbers mean?

Chmod numbers represent Unix file permissions: Read (r) = 4, Write (w) = 2, Execute (x) = 1. These are summed per user class (Owner, Group, Others). For example, 755 means Owner has read+write+execute (4+2+1=7), Group has read+execute (4+1=5), and Others has read+execute (4+1=5).