Chmod Calculator
Calculate Linux file permission modes visually. Convert between numeric, symbolic, and chmod command formats.
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File Type:
Owner (u)
4
2
1
Group (g)
4
2
1
Others (o)
4
2
1
Numeric
755
Symbolic
rwxr-xr-x
chmod 755 filename
Enter Numeric Mode:
type a 3-digit octal mode to update checkboxes
Common Presets:
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About chmod
chmod (change mode) controls who can read, write, or execute a file/directory in Linux/Unix. Permissions are set for three groups: Owner, Group, and Others.
Each group has three bits: r=4 (read), w=2 (write), x=1 (execute). The numeric mode is the sum: 7=rwx, 6=rw-, 5=r-x, 4=r--, etc.
Common modes: 755 — owner full, group/others read+execute (typical for web files). 644 — owner read+write, others read-only (typical for documents). 600 — owner only, no access to others (for private keys).