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🔒 Chmod Calculator

Visually calculate Linux/Unix file permissions with setuid/setgid/sticky special bits, common presets, and 3-way octal↔symbolic↔checkbox sync

Permission Matrix

Read (r) Write (w) Execute (x)
Owner (u)
Group (g)
Others (o)

Special Bits

Direct Input

Common Presets

Results

Octal 0755
Symbolic rwxr-xr-x
chmod Command chmod 755 filename
ls -l Preview -rwxr-xr-x
Explanation

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Chmod Calculator visually computes Linux/Unix file permissions locally in your browser. Features 3-way real-time sync between octal, symbolic, and checkboxes, supports setuid/setgid/sticky special bits, includes 600/644/700/755/775/777 common presets, and outputs chmod commands, ls -l previews, and human-readable explanations. No installation required — runs entirely offline.