codeyaan

Chmod Calculator

SEO & Config

Calculate Unix file permissions in numeric and symbolic notation

Runs in browser Instant No tracking

Octal

644

Symbolic

-rw-r--r--

chmod 644 filename
Read (4)Write (2)Execute (1)
owner
group
other

Common Permissions

How to use

  1. 1Toggle read, write, execute permissions for owner, group, and other
  2. 2The octal and symbolic values update automatically
  3. 3Or enter an octal value directly to see the permissions
  4. 4Use common presets for quick selection

FAQ

What is chmod?

chmod (change mode) is a Unix/Linux command that changes file or directory permissions. It controls who can read, write, or execute a file.

How do octal permissions work?

Each digit (0-7) represents permissions for owner, group, and others. Read=4, Write=2, Execute=1. Add them up: 7=rwx, 6=rw, 5=rx, 4=r, 0=none.

What is 755 vs 644?

755 means owner can read/write/execute, everyone else can read/execute. Used for directories and scripts. 644 means owner can read/write, everyone else can only read. Used for regular files.

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