Is chmod Calculator free?

Yes, chmod Calculator is completely free with no limits, watermarks, or registration required. Use it unlimited times.

What does chmod 755 mean?

chmod 755 means: Owner has read/write/execute (7), Group has read/execute (5), Others have read/execute (5). Commonly used for directories and executable scripts.

What does chmod 644 mean?

chmod 644 means: Owner has read/write (6), Group has read-only (4), Others have read-only (4). Standard for regular files like documents and images.

How do I make a file executable?

Check the 'Execute (x)' box under 'Owner', then check 'Read (x)' under 'Group' and 'Others' as needed. The most common executable permission is 755 (full access for owner, read/execute for others).

What's the difference between 755 and 777?

chmod 755 restricts write access to the owner only. chmod 777 gives read, write, and execute permissions to everyone, which is a security risk for most files.

Does chmod Calculator work on mobile?

Yes, chmod Calculator works on all devices including iPhone, Android tablets, and desktops. The interface is fully responsive and touch-friendly.

Is my file safe with chmod Calculator?

Yes. All calculations happen entirely in your browser. No files are uploaded, stored, or transmitted to any server. Complete privacy guaranteed.

Can I convert multiple permissions at once?

Yes, you can calculate as many permission codes as needed. Simply adjust the checkboxes and copy each result. No limits on conversions.

What does the first digit in chmod 0755 mean?

The first 0 is the setuid/setgid/sticky bit (special permissions). Most standard files use 0. The remaining three digits (755) define owner, group, and others permissions.

How do I make a file read-only?

Check only the 'Read (r)' box under 'Owner'. Leave 'Write' and 'Execute' unchecked. For read-only to everyone, set permissions to 444 (read for owner, group, and others).

free

chmod Calculator — free

Calculate Unix file permissions in octal notation.

How to use chmod Calculator

Select Permission Types

Check the boxes next to each permission you need. Under the 'Owner', 'Group', and 'Others' columns, tick 'Read (r)', 'Write (w)', and 'Execute (x)' as required. Each section controls permissions for different user types.

View Real-Time Octal Output

Watch the octal notation update automatically in the 'Octal Code' field as you select permissions. The four-digit code displays instantly (e.g., 0755, 0644). Copy this value directly from the output box.

Copy and Apply to Terminal

Click the 'Copy' button next to the octal code result. Paste the value into your terminal command: chmod [octal-code] [filename]. Press Enter to apply permissions to your file.

Decode Existing Permissions

Alternatively, enter an existing octal code (like 755 or 644) in the 'Octal Input' field and click 'Decode'. The calculator automatically checks the correct permission boxes for that value.

Frequently Asked Questions

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