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CHMOD Calculator

Calculate Unix file permissions with interactive checkboxes, octal and symbolic notation

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About This Tool

CHMOD Calculator is an interactive tool for computing Unix file permissions. Toggle checkboxes for owner, group, and others to instantly see the octal notation, symbolic notation, and a ready-to-use chmod command. It also provides common permission presets for quick selection.

Key Features

Quick Preview

Use Cases

chmod permissions unix linux

Frequently Asked Questions

What is the CHMOD Calculator?

The CHMOD Calculator is an interactive tool that lets you set Unix file permissions using checkboxes and instantly see the octal and symbolic notation, plus a ready-to-use chmod command.

What do CHMOD permission numbers mean?

CHMOD numbers are octal values where read=4, write=2, execute=1. Three digits represent owner, group, and others. For example, 755 means owner has full permissions (7=4+2+1), group has read+execute (5=4+1), and others have read+execute (5=4+1).

What are the common permission presets?

Common presets include 644 for default files, 755 for default directories, 777 for full access, 700 for owner-only, and 444 for read-only. The calculator provides one-click buttons for these.

Can I copy the chmod command directly?

Yes. The calculator generates a ready-to-use chmod command that you can copy to your clipboard with a single click and paste into your terminal.

Does the tool work on mobile devices?

Yes. The CHMOD Calculator is fully responsive and works on smartphones, tablets, and desktops. All calculations happen locally in your browser.