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Chmod Calculator (Linux File Permissions)
Free chmod calculator: turn read, write and execute boxes for owner, group and others into an octal mode (755, 644) and symbolic mode (rwxr-xr-x), with setuid, setgid and sticky bits and a copyable chmod command.
| Read | Write | Execute | |
|---|---|---|---|
| Owner (user) | |||
| Group | |||
| Others |
Octal
755
Symbolic
rwxr-xr-x
chmod 755 filename
Common modes
- 644 · Files: owner can edit, everyone reads
- 755 · Folders and scripts
- 600 · Private files (SSH keys)
- 700 · Private folders, ~/.ssh
- 664 · Shared group files
- 775 · Shared group folders
- 777 · Everyone can do everything (avoid)
- 1777 · Shared temp folder (/tmp)
Read = 4, write = 2, execute = 1; add them for each of owner, group and others. On folders, execute means "can open the folder". The optional first digit sets setuid (4), setgid (2) and sticky (1).
📚 Official sources: GNU coreutils: chmod
We build every tool from the official rules and re-check them when they change. Always confirm with the official source before you rely on a result.
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Related tools
Questions people ask
What does chmod 755 mean?+
Owner can read, write and execute (7); group and others can read and execute (5). It's the usual mode for folders and scripts.
What does chmod 644 mean?+
Owner can read and write (6); everyone else can only read (4). It's the usual mode for web files.
Why not use chmod 777?+
It lets every user change or replace the file, which is a security risk on any shared server.