Linux Permissions Calculator - Free Online IT Tool

🔒 Linux Permissions Calculator

Convert numeric permissions to symbolic notation (rwx) and build chmod commands.

Owner

Group

Others

ℹ️ About Linux Permissions Calculator

The Linux Permissions Calculator (Chmod Calculator) is a fundamental utility for anyone managing files on Unix-like operating systems. Linux uses a specific three-digit numeric system to define access rights for the **Owner**, the **Group**, and **Others**.

This tool allows you to select the desired rights for each level and instantly generates both the Octal (numeric) value and the Symbolic (rwx) string. It also provides a ready-to-use CLI command. Understanding these permissions is critical for web server security, ensuring that sensitive configuration files aren't readable by the public, and that scripts have the necessary rights to execute.

📖 How to use Linux Permissions Calculator

1. Select the permission level for the file Owner (the user who created it).
2. Select the level for the Group (other users in the same group).
3. Select the level for Others (everyone else on the system).
4. Click 'Run Tool' to generate the numeric mode and the <code>chmod</code> command.

❓ Frequently Asked Questions

What does 755 mean?

It means the Owner has full rights (7), while the Group and Others can only read and execute (5). This is common for public directories and executable scripts.

What is the 'rwx' notation?

It stands for Read, Write, and eXecute. If a character is replaced by a hyphen (e.g., <code>r-x</code>), that specific permission is denied.

Why is 644 common for files?

644 (<code>rw-r--r--</code>) allows the owner to edit the file while everyone else can only read it, which is the standard security posture for most web assets.