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Chmod Calculator
Calculate Unix file permissions in numeric and symbolic notation
SEO & Config Runs in your browser
Octal
644
Symbolic
-rw-r--r--
chmod 644 filename| Read (4) | Write (2) | Execute (1) | |
|---|---|---|---|
| owner | |||
| group | |||
| other |
Common Permissions
How to Use
1Toggle read, write, execute permissions for owner, group, and other
2The octal and symbolic values update automatically
3Or enter an octal value directly to see the permissions
4Use common presets for quick selection
Frequently Asked Questions
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.