This article describes what an HPGL file is and how to open it or convert it to another file format, such as PDF, DXF, DWF, etc.
Export to Hpgl
A file with the HPGL file extension is an HP Graphics Language file that sends printing instructions to plotter printers. Unlike other printers that use dots to create images, symbols, text, etc., a plotter printer uses the information in the HPGL file to draw lines on the paper.
To view the image created on the plotter, you can open HPGL files for free with XnView or HPGL Viewer.
You can also read HPGL files with Corel's PaintShop Pro, ABViewer, CADintosh, and ArtSoft Mach. Given how common these files are for plotters, the HPGL format is likely to be supported in most similar tools.