1. 01Tick the r/w/x boxes and whichever special permissions you need, or type octal or symbolic permissions straight in.
2. 02Watch the octal and symbolic results stay in step as you change either one.
3. 03Enter a target file name, then copy the numeric or the symbolic chmod command.
4. 04Or click a common preset such as 644 or 755 to apply it immediately.

• Octal input has to be 3 or 4 digits, each in the range 0–7; symbolic input has to be 9 characters, and the 10-character form printed by ls -l can be pasted in too.
• Special bits are shown as lower or upper case s/S/t/T according to whether the matching execute bit is set, rather than being appended as an extra character.
• The file name is only concatenated into the command that is displayed. The tool does not escape it for the shell and does not check whether the file exists, so names with spaces or special characters must be quoted correctly on your side.
• The page never connects to a terminal, never reads real file permissions and never executes chmod.
• What a permission actually means also depends on the file or directory type, ACLs, umask and mount options; this tool computes traditional Unix mode bits and nothing else.

Permissions and file names are computed entirely in your browser; the tool never touches the file system or a remote host.