Calculate Unix file permissions with visual toggle
Built & maintained by Pappu Venkata Subbi Reddy, founder of Clacify
Clacify's Chmod Calculator lets you toggle read (r), write (w), and execute (x) permissions for owner, group, and others, and instantly shows the corresponding numeric chmod value (e.g. 755, 644, 777). It also works in reverse — enter a numeric permission like 755 and see which permission bits are set. Essential for Linux/Unix server administration, setting web file permissions on cPanel or SSH, and understanding permission errors.
chmod 755 means: owner has read+write+execute (7 = 4+2+1), group has read+execute (5 = 4+0+1), others have read+execute (5). This is the standard permission for web server directories and executable scripts — the owner can modify them, everyone else can read and run them.
chmod 644: owner can read+write (6), group and others can only read (4) — standard for web files like HTML, CSS, images. chmod 755: owner can read+write+execute (7), group and others can read+execute (5) — standard for directories and executable scripts. Files should typically be 644; directories 755.