Linux / chmod

chmod Permission Calculator

Convert Linux file permissions between checkboxes, octal values, symbolic notation, and chmod commands.

Permission matrix

Special bits: setuid (4) setgid (2) sticky (1)

Octal Symbolic notation

All calculations run locally. Octal supports 3 digits (755) or 4 digits with special bits (4755).

Command

chmod 000 file

Click a command above to copy it to the clipboard.

Permission reference

Number	Symbolic	Description
644	rw-r--r--	Common file default：owner can read and write; others can read
755	rwxr-xr-x	Common for directories and scripts：owner has full access; others can read and execute
600	rw-------	Private file：only the owner can read and write (required for SSH private keys)
700	rwx------	Private directory：only the owner can enter and access
775	rwxrwxr-x	Shared directory：group members can write
664	rw-rw-r--	Shared file：group members can edit
777	rwxrwxrwx	Anyone can read, write, and execute——high risk; do not use in production

Click any row to apply that permission.

About chmod Permission Calculator

Convert Linux file permissions between checkboxes, octal values, symbolic notation, and chmod commands. Processing happens locally in your browser, and the tool does not upload the entered content.

Privacy and compatibility

Results depend on browser capabilities and the supplied input. Review generated output before using it in production or formal documents.

Subject	读 r (4)	写 w (2)	执行 x (1)
Owner (u)
Group (g)
Others (o)