Chmod Calculator
NEWConvert Unix file permissions between checkboxes, octal (755), and symbolic (rwxr-xr-x) notation.
Frequently asked questions
What do the numbers in chmod 755 mean?
Each digit is one group — owner, group, then others — and is the sum of read (4), write (2), and execute (1). So 755 gives the owner read, write, and execute (7) and everyone else read and execute (5).
What's the difference between 644 and 755?
644 (rw-r--r--) lets the owner edit a file while everyone else can only read it — the usual choice for regular files. 755 (rwxr-xr-x) adds execute for everyone, which scripts, programs, and directories need so they can be run or entered.
Does this cover setuid, setgid, and the sticky bit?
No — it handles standard three-digit permissions only. The special bits add a fourth leading digit, which isn't included here.
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