Chmod Calculator
Chmod Calculator
Set Unix file permissions interactively; numeric octal and symbolic notation; umask calculator; POSIX ACL reference.
Entity
Read (4)
Write (2)
Execute (1)
Owner
Group
Others
Special
Common presets
644
Octal
rw-r--r--
Symbolic
chmod 644 <file>Permission bits reference
r
Read (4) — view file contents / list directory
w
Write (2) — modify file / create or delete in directory
x
Execute (1) — run file / enter directory
s
setuid/setgid — run with owner or group privileges
t
Sticky bit — only owner can delete entries in directory
Chmod Calculator
Set Unix file permissions interactively; numeric octal and symbolic notation; umask calculator; POSIX ACL reference.
Common uses
- Convert 755 to rwxr-xr-x symbolic notation
- Calculate the umask needed for new files
- Set read/write for owner only
Frequently asked questions
Can I use Chmod Calculator to convert 755 to rwxr-xr-x symbolic notation?
Yes. Chmod Calculator can convert 755 to rwxr-xr-x symbolic notation, directly in your browser.
Can I use Chmod Calculator to calculate the umask needed for new files?
Yes. Chmod Calculator can calculate the umask needed for new files, directly in your browser.
Can I use Chmod Calculator to set read/write for owner only?
Yes. Chmod Calculator can set read/write for owner only, directly in your browser.
Is my data uploaded to a server?
No. This tool runs entirely in your browser — your input is processed locally on your device and is never uploaded or stored on a server.