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PaddedForm

Right-aligns a number in a field of n digit columns plus a column for the sign. A {n, f} spec puts f of the digits after the decimal point.

$ wo 'ToString[PaddedForm[123, 6]]'
    123

$ wo 'ToString[PaddedForm[1.5, {4, 2}]]'
  1.50

A list pads every element to the same width:

$ wo 'ToString[PaddedForm[{1, 22, 333}, 4]]'
{    1,    22,   333}

NumberPadding given as a single string sets the fill of the integer field:

$ wo 'ToString[PaddedForm[-123, 6, NumberPadding -> "0"]]'
000-123

$ wo 'ToString[PaddedForm[-123, 6, NumberPadding -> "0", SignPadding -> True]]'
-000123

NumberSigns fills the sign column:

$ wo 'ToString[PaddedForm[123, 6, NumberSigns -> {"", "+"}]]'
   +123

DigitBlock widens the field by the separators a full field would carry:

$ wo 'ToString[PaddedForm[123456, 8, DigitBlock -> 3]]'
    123,456

Requesting fewer significant figures than the number has integer digits pads them with zeros and warns:

$ wo 'ToString[PaddedForm[1234.5678, 3]]'

PaddedForm::reqsigz: Requested number precision is lower than number of digits shown; padding with zeros.
 1230.