Chmod calculator
Type permissions as digits or letters to get the other form and a ready chmod command, including setuid, setgid and sticky bits.
Loading the tool…
Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Enter permissions (octal or symbolic).
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
Each digit = read 4 + write 2 + execute 1, in the order owner, group, others. An optional leading digit: setuid 4, setgid 2, sticky 1.
Example
Inputs: Permissions (octal or symbolic) = 755. Result: Octal: 755.
755
755
Limits and caveats
- Relative forms like u+x or g-w are not supported, only full permission sets.
- ACLs and SELinux labels are outside what chmod numbers describe.
Questions about this tool
What does 755 mean?
Owner can read, write and execute (7); group and others can read and execute (5). It is typical for folders and scripts.
Why avoid 777?
It lets every user on the server change or delete the file, which is a security risk.
What is the difference between s and S?
s means setuid or setgid with execute set; S means the bit without execute, usually a misconfiguration.