chmod Calculator
Visual Unix file permission calculator. Toggle checkboxes, enter octal values, or pick from common presets. Get the chmod command, symbolic notation, and a plain English explanation instantly.
Permission Calculator
Common Permissions
Click any preset to apply it to the calculator above.
Why This Calculator
Visual Checkboxes
Toggle read, write, and execute permissions visually for owner, group, and others. No memorizing octal values needed.
Bidirectional
Enter an octal number and see checkboxes update, or toggle checkboxes and see the octal value change in real time.
Plain English
Every permission combination is explained in clear, human-readable language. No Unix manual required.
Special Permissions
Full support for setuid, setgid, and sticky bit. See how they appear in ls -la output with the correct flags.
Common Presets
One-click presets for the most used permissions: 644, 755, 777, 600, 400, and more with use-case descriptions.
100% Client-Side
Everything runs in your browser. Nothing is sent to any server. Works offline too.
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