Chmod Calculator
Calculate Linux/Unix file permissions interactively. Click to toggle, enter octal values, or use common presets.
Enter Octal Value
0
Toggle Permissions
Read (4)
Write (2)
Execute (1)
Owner
r
w
x
Group
r
w
x
Others
r
w
x
Octal
755
Symbolic
rwxr-xr-x
File Type
-rwxr-xr-x
chmod 755 filename
Common Presets
Understanding Linux File Permissions
Linux uses a 3-digit octal number to represent file permissions for owner, group, and others:
- Read (4) — View file contents or list directory
- Write (2) — Modify or delete the file
- Execute (1) — Run the file or access directory
- Combine values:
rwx = 4+2+1 = 7,r-x = 4+0+1 = 5