Chmod Calculator
Calculate Unix file permissions in octal and symbolic notation
644-rw-r--r--chmod 644 filename| Read | Write | Execute | Value | |
|---|---|---|---|---|
| Owner | 6 | |||
| Group | 4 | |||
| Others | 4 |
How to Use Chmod Calculator
Calculate Unix/Linux file permissions interactively. Toggle read, write, and execute for owner, group, and others to get the octal and symbolic notation.
- 1
Toggle permissions
Check or uncheck Read, Write, and Execute boxes for Owner, Group, and Others.
- 2
View the result
See the octal value (e.g. 755), symbolic notation (e.g. -rwxr-xr-x), and the chmod command.
- 3
Or enter octal directly
Type a 3-digit octal value to set permissions, or click a common preset.
Frequently Asked Questions
What is chmod?
chmod (change mode) is a Unix/Linux command that sets file and directory permissions for owner, group, and others.
What does 755 mean?
755 means: owner can read/write/execute (7), group can read/execute (5), others can read/execute (5). Common for directories.
What does 644 mean?
644 means: owner can read/write (6), group can read (4), others can read (4). Common default for files.
Is this tool free?
Yes, completely free with no signup required.