Calculate Linux file permissions interactively. Toggle permissions for Owner, Group, and Others to generate numeric and symbolic notation.
Numeric
755
Symbolic
rwxr-xr-x
7
5
5
$ chmod 755 filenameCommon Presets
Permission Reference
| Number | Symbol | Permission |
|---|---|---|
| 0 | --- | No permission |
| 1 | --x | Execute |
| 2 | -w- | Write |
| 3 | -wx | Write + Execute |
| 4 | r-- | Read |
| 5 | r-x | Read + Execute |
| 6 | rw- | Read + Write |
| 7 | rwx | Read + Write + Execute |
chmod (change mode) is a Linux and Unix command that sets read, write, and execute permissions on files and directories. Permissions are expressed in numeric (octal) notation like 755 or symbolic notation like rwxr-xr-x, and control who can access or modify a file.
Toggle the read, write, and execute checkboxes for Owner, Group, and Others. The tool instantly generates the matching numeric and symbolic chmod values, along with a ready-to-copy chmod command you can paste into your terminal.
Common use cases include making a script executable (chmod 755), restricting a config file to the owner (chmod 600), or opening a directory for shared access. Getting the octal value wrong can expose sensitive files, so a visual calculator helps you set the right permissions the first time.