Chmod Calculator
undefined
What this tool does
undefined
How permissions work
Unix permissions are three groups (owner, group, public), each with read (4), write (2) and execute (1) bits that sum to a digit 0-7. 755 means owner=rwx (7), group=r-x (5), public=r-x (5) - a very common setting for scripts and executables.
Frequently asked questions
What does execute mean for a directory?
For a directory, execute permission controls whether you can enter (cd into) it and access files inside, not whether it can be "run".
What is a common safe default for web files?
644 for regular files (owner read/write, everyone else read-only) and 755 for directories and scripts are common defaults, though the right setting depends on your server configuration.
