Free Linux Chmod (Permissions) Calculator

Linux Chmod Permissions Calculator

Owner (User)

Group

Public (Other)

Numeric (Octal) 644
Symbolic (Letter) -rw-r–r–
> chmod 644 file.txt

Runs 100% locally in your browser.

How to use this Linux Chmod Calculator? Simply check the boxes for Read (4), Write (2), and Execute (1) under Owner, Group, and Public categories. The calculator will instantly generate the correct numeric (octal) and symbolic permissions for your Linux/Unix system.

Common Linux Permissions:

  • 777 (-rwxrwxrwx): Anyone can read, write, and execute. (Use with caution!)
  • 755 (-rwxr-xr-x): Owner has full control. Others can only read and execute. Common for web directories.
  • 644 (-rw-r--r--): Owner can read and write. Others can only read. Common for files like .html or .php.
  • 600 (-rw-------): Only the owner can read and write. Common for SSH keys and sensitive files.
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