⌥
chmod Calculator
Convert between octal and symbolic permissions, edit bits individually and see what special bits mean — without touching your filesystem or running chmod.
Runs in browserPermissionsUnix
Loading tool…
How to use
- Type octal (755 / 4755) or symbolic (u+x,g-w) and both sides stay in sync.
- The case of a special bit carries meaning: s when the execute bit is set, S when it is not — “setuid but not executable” is the classic misconfiguration.
- chmod +x with no who is subject to the umask, and the umask is editable right there.