Developer Tools

Chmod Calculator

Q: Can I type an octal value instead of clicking?

Yes. Enter a three-digit octal such as 644 in the input box and the checkboxes update to match. This is handy when you already know the mode and just want the symbolic string or the full command.

Toggle read, write, and execute for owner, group, and other to see the octal value, the symbolic permission string, and a ready-to-copy chmod command.

🔐 Permissions

Who	Read (4)	Write (2)	Execute (1)	Value
Owner				0
Group				0
Other				0

Tick a box to grant that permission. Read = 4, Write = 2, Execute = 1 — add them up per column.

📋 Result

Octal

000

Symbolic

---------

Command

⌨️ Or type an octal value

Enter a 3-digit octal (each digit 0–7) to set the checkboxes above. For example 755 gives rwxr-xr-x.

A Chmod Calculator turns Unix file permissions into the numbers and commands you actually type in a terminal.

Tick the boxes for read, write, and execute across owner, group, and other, and it instantly shows the octal value, the symbolic rwx string, and a copy-ready chmod command.

How permission numbers work

Every permission has a value: read is 4, write is 2, and execute is 1.

You add those values within each group, so read plus execute becomes 5, and read plus write plus execute becomes 7.

Three groups sit side by side — owner, group, and other — which is why a mode like 755 has exactly three digits.

Octal and symbolic, both directions

The calculator works either way you like to think about permissions.

Toggle the checkboxes to build a mode visually, or type an octal value such as 644 to set the boxes for you.

It runs entirely in your browser, so nothing you enter is uploaded or stored, and it keeps working offline once loaded.

Where chmod fits in a workflow

Setting the right mode matters most when you deploy scripts and web files to a server.

A CGI script or a cron job often needs the execute bit, which pairs naturally with scheduling tasks using a Crontab Generator.

Web directories usually want 755 and files 644, the same permissions you protect further with rules from an Htaccess Generator.

And when you name deployment artifacts or lock files, a quick unique token from a UUID Generator keeps them from clashing.

Frequently Asked Questions

What does chmod 755 mean?

It gives the owner read, write, and execute (7), and the group and other read and execute (5 and 5). In symbolic form that is rwxr-xr-x. It is the usual mode for directories and executable scripts that everyone may read and run but only the owner may change.

What is the difference between octal and symbolic permissions?

Octal uses three digits from 0 to 7, where each digit sums read (4), write (2), and execute (1) for owner, group, and other. Symbolic spells the same thing out as rwx letters or dashes. Both describe identical permissions, just in different notations.

Can I type an octal value instead of clicking?

Yes. Enter a three-digit octal such as 644 in the input box and the checkboxes update to match. This is handy when you already know the mode and just want the symbolic string or the full command.

Is my data sent to a server?

No. The calculator runs completely in your browser with JavaScript. Nothing you toggle or type is uploaded, logged, or stored, and it continues to work offline after the page has loaded.

Chmod Calculator

How permission numbers work

Octal and symbolic, both directions

Where chmod fits in a workflow

Frequently Asked Questions

What does chmod 755 mean?

What is the difference between octal and symbolic permissions?

Can I type an octal value instead of clicking?

Is my data sent to a server?

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