Chmod calculator

Toggle Unix permission bits and inspect exact octal, symbolic and special-bit representations.

Permission matrix

0755

Who	Read	Write	Execute	Octal
Owner				7
Group				5
Others				5

Symbolic moderwxr-xr-x

Octal modeThree or four digits, using 0–7.

Setuid (4000)

Setgid (2000)

Sticky bit (1000)

For directories, execute means search/traverse. The matrix represents bits, not a guarantee of effective access.

Processed on your device

How it works & useful details

How it works & supported syntax

Toggle read(4), write(2) and execute/search(1) bits for owner, group and others. The leading optional octal digit encodes setuid(4), setgid(2) and sticky(1). Uppercase S or T means the special bit is set while execute is absent.

This calculates mode bits only. File type, ownership, ACLs, mount options and platform rules affect actual access. In particular, numeric chmod behavior for existing directory special bits varies. No file permissions are changed.

Local workspace

Your input stays in this page. These tools calculate or process text; they do not run commands, start containers, contact servers or change settings on your device.

Previews pause above 20,000 combined characters. Use the action to process the full supported input. Exports contain the complete result within the tool’s stated limits.