This is a simple to use tool for dynamically converting decimal values to binary values. It can take decimal numbers up to 9999999999999999999.
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In full the template code is as follows:
{{Decimal to binary converter|1234}}
But it is much easier to use it through the redirect dec-bin which allows it to be written out as:
{{Dec-bin|1234}}
Both of which will output {{Dec-bin|1234}}.