Free online HGL to DWG converter

Plotter files with an HGL extension often arrive with archived CAD drawings or scans of old plotting workflows, but many CAD editors and project handoffs require DWG. Converting the plot instructions makes the linework available in a DWG-based workflow, although it does not restore the original design structure.

What the HGL format is

In CAD, HGL usually refers to Hewlett-Packard Graphics Language (HP-GL), a vector plotter format. CAD programs and plotting utilities create HGL files to describe pen movements, lines, and other marks for a plotter; you may encounter them as legacy plot output or as files exported for printing. HGL stores plotted appearance rather than the full parametric or object-based model from the original drawing.

What the DWG format is

DWG is a native drawing format used by AutoCAD and supported by many other CAD applications. It can hold editable CAD entities, layers, dimensions, and other drawing data, making it suitable for continued drafting and exchange with DWG-based workflows. A conversion from HGL can provide editable linework, but cannot recreate design data that was not present in the plot file.

How to convert HGL to DWG

Online on 101convert.com

1. Upload the HGL file on the converter page. You can add several files for batch conversion; the page shows the per-file size limit.
2. Set the AutoCAD version before converting.
3. Start the conversion and download the resulting DWG file or files.

Offline with desktop software

AutoCAD: On an installation that includes the HPGL import utility, run HPGLIN, select the HGL/HP-GL file, and follow the prompts to import its plotted vectors. Then use Save As and choose DWG. Availability of the import command can vary by AutoCAD version and installation; if HPGLIN is not recognized, that installation cannot use this route.

Quality and limitations

Check the imported drawing’s scale and orientation against known dimensions: HP-GL coordinates and plot settings determine the output size. HGL generally preserves plotted paths, not source layers, blocks, dimensions, or editable text objects; text may be represented as strokes, and curves can become segmented linework. Review the DWG before using it for dimension-critical work.