Your files stay on your device

# chmod calculator

Octal ⇄ symbolic permission modes, both directions: 754 is u=rwx,g=rx,o=r. Special bits (setuid, setgid, sticky) named for what they actually do.
Octal inSymbolic in75464460075517774755Octal modeConvert
 Class read (4) write (2) execute (1) On a directory
 user r: ls the contents · w: create/delete own files · x: enter and pass through
 group same three bits, group-scoped
 other same three bits, everyone-else-scoped
 special setuid/setgid change effective user/group on exec; sticky restricts deletion in shared dirs (/tmp).

- No umask arithmetic and no a+r/g-w operation modes. Those apply a change to an EXISTING mode this page does not know. Full assignments and octal only.
- X (capital) is execute-only-if: resolved here as no-execute for a regular file, with the assumption stated: a directory target would differ.
- Permissions do not grant access alone: ownership, mounts, and higher-level ACLs all sit on top.
Paste, drop, or type to begin. Everything stays on this device.

## More config file tools

- [docker run → compose](/config/docker)
- [Glob tester](/dev/glob-tester)
[All config file tools](/config)

---

Canonical HTML: https://nutter.tools/config/chmod/
Markdown version: https://nutter.tools/config/chmod/index.md
Plain-text version: https://nutter.tools/config/chmod/index.txt
Agent index: https://nutter.tools/llms.txt