PLT is a file format which is used by HP professional plotter to understand and print in line 2D images and much more. The Format is now universal for most of the plotter machines and professional use it very often in this field. The files in this format are not open able by simple means and needs specific software to be opened and edited. We have provided you with a list of software which lets you open and edit these files. However, as this format is a professional level format, most of the software which supports the format are paid and only available in trial versions, and it is mentioned which software is a trial version. Some of this software are free and can only be used as an image viewing software, you cannot edit those images in the software, but you can study the image thoroughly as the software packages provide you with the feature of zooming, panning and rotating.