Developer

chmod Calculator

Bidirectional permission editor: tick the 3×3 grid, type octal (0755), or write symbolic (rwxr-xr-x). Setuid / setgid / sticky-bit support, plain-English explanation, common presets, and ready chmod / find commands.

Permission grid

Toggle individual permission bits for owner, group, and others.

Audience	rRead	wWrite	xExecute
Owner
Group
Others

Common presets

Click a chip to load that mode.

Octal & symbolic

Edit either input — the grid stays in sync.

Octal3 or 4 digits. Leading digit is setuid/setgid/sticky (e.g. 4755).Symbolic10 characters: file type slot + rwx triplets (e.g. -rwxr-xr-x).

Octal

644

Full octal

0644

Symbolic

-rw-r--r--

Shell commands

Numeric chmod

chmod 644 filename

Symbolic chmod

chmod u=rw,g=r,o=r filename

Execute toggle

chmod -x filename

Apply recursively to all files

find . -type f -exec chmod 644 {} \;

Plain English

Owner can read and write.
Group can read.
Others can read.

No common security pitfalls detected for this mode.