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

755 means: owner can read/write/execute (7), group can read/execute (5), others can read/execute (5). It's the standard permission for directories and scripts.

What's the difference between numeric and symbolic notation?

Numeric uses octal digits (755). Symbolic uses letters (rwxr-xr-x). They represent the same permissions — numeric is more compact, symbolic is more readable.

Linux Chmod Calculator

Interactive chmod permission calculator. Convert between numeric (755) and symbolic (rwxr-xr-x) Linux file permissions.

Numeric

755

Symbolic

-rwxr-xr-x

Command

chmod 755 filename

Enter numeric permission:

Owner (User)

rReadwWritexExecute

7

Group

rReadwWritexExecute

5

Others

rReadwWritexExecute

5

Common Permissions

About Linux File Permissions

Linux file permissions control who can read (r), write (w), and execute (x) files and directories. Permissions are set for three groups: owner, group, and others. The chmod command uses either numeric (octal) notation like 755 or symbolic notation like rwxr-xr-x. Common values: 755 for directories/scripts, 644 for regular files, 600 for private files.

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How to Use

Click checkboxes to set read/write/execute permissions for owner, group, and others
Or type a numeric permission (e.g., 755) to auto-set checkboxes
View the numeric, symbolic, and command representations
Click a common permission preset for quick setup

Common Use Cases

Setting up web server file permissions
Configuring deployment scripts
Securing sensitive files (SSH keys, config files)
Troubleshooting 'permission denied' errors

Linux Chmod Calculator

Common Permissions

About Linux File Permissions

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How to Use

Common Use Cases

Frequently Asked Questions