chmod Calculator

Convert Unix file permissions between checkboxes, octal (e.g. 755), and symbolic (rwxr-xr-x) notation.

Owner

Group

Other

About Unix permissions

Each of Owner, Group, and Other gets a read/write/execute combination, worth 4/2/1 respectively, summed into one octal digit — e.g. read + execute = 5. Toggle the checkboxes, or type an octal value like 755 directly, and the other representation updates.

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About chmod Calculator

chmod Calculator converts Unix file permissions between interactive permission checkboxes, octal notation (e.g., 755), and symbolic notation (e.g., rwxr-xr-x).

How to use chmod Calculator

  1. Check or uncheck Read, Write, and Execute boxes for Owner, Group, and Public.
  2. View instant updating of octal value (e.g. 755) and symbolic string.
  3. Copy command snippet (e.g., chmod 755 filename).
  4. Review security implications of selected permission levels.

Examples

Permissions: Owner (rwx), Group (r-x), Public (r-x) Octal Output: 755 Symbolic Output: -rwxr-xr-x

FAQ

What does octal 644 permission mean?

Octal 644 grants read/write permissions to owner, and read-only permissions to group and public users.

What are special permissions like SetUID or Sticky Bit?

Special permission flags can be toggled to configure SUID (4000), SGID (2000), and Sticky Bit (1000) octal prefixes.

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