chmod / Permission Calculator

Convert Unix file permissions between octal, symbolic and plain English.

What you provide

Result

755 = rwxr-xr-x

Owner, group and others each get read, write and execute independently. On a directory, execute means the right to enter it.

Nine bits, three triples

Mode 755

rwxr–xr–x

Owner 7 · Group 5 · Others 5 — a set bit is granted, a dash is denied

  • Owner
  • Group
  • Others
Diagnostic telemetry
Octal
755
Symbolic
rwxr-xr-x
Owner
read, write, execute
Group
read, execute
Others
read, execute

What this cannot tell you

  • Pure arithmetic on the permission bits. It does not read or change any real file.
  • Special bits (setuid, setgid, sticky) are the 4-digit octal form; a 3-digit chmod clears them.

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chmod / Permission Calculator on RunTheTests — free browser-based sysadmin tools, no sign-up.