Free online HPG to SVG converter

A plotter drawing saved as HPG may need conversion to SVG for editing in a vector graphics program, web use, or delivery to a system that accepts SVG. Converting it preserves supported plotter strokes as scalable vector artwork.

What the HPG format is

In graphics, HPG usually refers to an HP-GL or HP-GL/2 plotter file. It stores drawing instructions such as pen movements, lines, and pen selections rather than a grid of pixels. CAD and technical-drawing programs, plotter drivers, and older plotting workflows create HPG files; they are often encountered as plotter output or archived engineering drawings.

What the SVG format is

SVG is an XML-based vector format supported by browsers and vector editors. Its paths and shapes can be resized without pixelation, edited individually, and embedded in web pages. SVG is useful when a plotter drawing needs to be inspected, revised, or reused at different sizes.

How to convert HPG to SVG

Online on 101convert.com

1. Upload the HPG file on the converter page.
2. Choose or start the SVG conversion.
3. Download the resulting SVG file.

The converter runs on the site’s server with Inkscape and supports batch conversion. A per-file size limit is shown on the page.

Offline with desktop software

Inkscape is free and available for Windows, macOS, and Linux. Open the file with File → Open, selecting the HPGL/PLT format if the file picker does not show HPG. If the installed version lacks its HPGL input extension, it cannot import the file directly. Once the drawing opens, use File → Save As and choose SVG.

CorelDRAW can import HPGL/PLT files in versions that include the HPGL import filter. Use File → Open to import the drawing, then File → Export and select SVG. Check the file-type filter if HPG is not listed by extension.

Quality and compatibility

HPG records plotter instructions, so the converter must interpret pen settings and drawing coordinates. Stroke widths, colors, scaling, and text appearance can differ from the original plotting setup; inspect the SVG before production use. Supported lines and shapes remain vector objects, but unsupported HP-GL commands may be omitted or interpreted differently.