Chmod Calculator
Calculate Unix file permissions visually. Toggle read, write, execute for Owner, Group, and Others. Get the octal and symbolic chmod command.
| Permission Set | Read (4) | Write (2) | Execute (1) | Value | Sym |
|---|---|---|---|---|---|
| Owner (u) | 0 | --- | |||
| Group (g) | 0 | --- | |||
| Others (o) | 0 | --- |
Common Presets
Octal
000
Symbolic
---------
chmod 000 filename
What This Means
Frequently asked
questions
chmod 755 means: Owner can read/write/execute (7=4+2+1), Group can read/execute (5=4+1), Others can read/execute (5=4+1). This is common for web server directories and executable files.
chmod 644 means: Owner can read/write (6=4+2), Group can only read (4), Others can only read (4). This is the standard permission for web files like HTML, CSS, and PHP.
For directories, the execute (x) bit controls whether a user can access (traverse into) the directory, not whether it can be run as a program. Without execute permission on a directory, you cannot cd into it or access files inside.