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Linux CHMOD Calculator

Calculate Linux file permissions with interactive read, write, execute checkboxes, octal numbers (755, 644), and chmod commands.

Octal Notation
755
0755
Symbolic Notation-rwxr-xr-x
Interactive Permission Matrix
Owner (User)7
Group5
Public (Others)5
Quick Production Presets
Target Path:
chmod 755 /var/www/html

About Linux CHMOD Calculator

Setting correct Linux permissions is critical for security and application execution. The OpsKitTools CHMOD Calculator makes permission calculations intuitive through interactive checkboxes for Owner, Group, and Public, displaying octal values, symbolic notations, and ready-to-run shell commands.

How to Use This Tool

  1. Check or uncheck Read (r), Write (w), and Execute (x) boxes for Owner, Group, and Others.
  2. Or type an octal value like '755' or '644' into the octal input to reverse-calculate permissions.
  3. Optionally enter a file or directory path to generate copyable 'chmod' commands.
  4. Click on quick presets like '755 (Web Executable)', '644 (Standard File)', or '400 (Private Key)'.

Practical Examples & Use Cases

Web Server File Permissions

Input
Owner: r/w/-, Group: r/-/-, Others: r/-/-
Expected Output
644 (rw-r--r--)

Ideal standard permissions for HTML, PHP, and image files on Linux web servers.

Executable Script or Directory

Input
Owner: r/w/x, Group: r/-/x, Others: r/-/x
Expected Output
755 (rwxr-xr-x)

Allows directory traversal and script execution while restricting write access to the owner.

Frequently Asked Questions

SSH clients strictly refuse to use private keys that are readable by other users or groups on the system to prevent unauthorized access.

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