Chmod Calculator
NewCalculate Unix file permissions with a visual toggle grid and symbolic/octal notation.
Permission Grid
Toggle owner, group, and others permissions.
| Class | Read | Write | Execute |
|---|---|---|---|
| Owner | |||
| Group | |||
| Others |
Output
Octal
755
Symbolic
-rwxr-xr-x
Command
chmod 755 filenameDescription
Common Presets
Click to applyFrequently Asked Questions
Does this calculator support setuid, setgid, or sticky bits?
No. It only handles the basic 3-digit owner/group/others rwx model, so values like 755 and 644 work, but 4755-style special bits are not part of this UI.
Can I paste symbolic permissions like -rwxr-xr-x?
Yes. The symbolic field accepts either -rwxr-xr-x or rwxr-xr-x, and the checkbox grid updates from it. Anything outside plain rwx triples is rejected.
Why didn’t my typed octal value update the grid immediately?
The octal and symbolic text inputs are wired to change events, not every keystroke. The conversion happens when the field change is committed.
What exactly does the Copy button copy?
It copies the ready-to-paste shell command shown in the output panel, like chmod 755 filename. It does not copy the symbolic string.
Can this explain what 755 or 644 actually means?
Yes. The description panel spells out owner, group, and others separately, such as read/write/execute for owner and read-only combinations for the other classes.