A golf putter length adjustment holder device (1) comprising a hollow extension tube that fits over a putter shaft (2). The tube may be telescoping, thereby permitting for quick length conversion of the golf putter. In the alternative, the tube may be of a pre-determined length. Because the golf putter length adjustment holder device (1) fits over a putter, a person need not physically alter an existing putter nor purchase a new adjustable putter to use the present invention.