Chmod Calculator
Tick read, write and execute for owner, group and others — or type an octal value like 755 — and get the matching symbolic notation and the exact chmod command.
How to use
Check the permissions you want in the grid; the octal number, the symbolic string (rwxr-xr-x) and the ready chmod command update as you go.
You can also type an octal value (e.g. 644) to set the checkboxes. Copy the command straight into your terminal.
FAQ
What does 755 mean?
Owner can read, write and execute (7 = rwx); group and others can read and execute (5 = r-x). It's typical for scripts and directories.
How is the octal number built?
Each digit is read=4 + write=2 + execute=1, summed per group. So rwx=7, r-x=5, rw-=6, r--=4.
What is 644 for?
Owner reads and writes; group and others read only. It's the usual permission for regular files that shouldn't be executable.
Does this change any files?
No — it only converts and shows the command. Run the copied chmod command in your own terminal to apply it.