Free online TIF to HPGL converter

Plotters and some CAD or cutting workflows accept HPGL rather than scanned TIFF images. Converting the image makes it usable in those workflows, but usually requires tracing raster pixels into vector paths.

What TIF is

TIF (also written TIFF) is a raster image format commonly used for scanned documents, maps, technical drawings, and high-quality images. Scanners and image-editing or desktop-publishing programs create TIFF files; the image is stored as pixels, sometimes with lossless compression or multiple pages.

What HPGL is

HPGL (Hewlett-Packard Graphics Language), often saved with a .plt or .hpgl extension, is a command language for pen plotters and compatible devices. It describes movements and drawing operations as vectors, making it suitable for line drawings, CAD output, and plotter or cutter workflows. Device support and command variations can affect compatibility.

How to convert TIF to HPGL

Online on 101convert.com

1. Upload the TIFF file or files to the converter on the page.
2. Choose HPGL as the output format and start the conversion.
3. Download the converted file or files when processing finishes. Multiple files can be converted in one batch; the page shows the per-file size limit.

Offline with desktop software

Inkscape is free and runs on Windows, macOS, and Linux. Since TIFF is pixel-based and HPGL is generally path-based, trace the image before exporting:

1. Open the TIFF in Inkscape. Select the image and use Path → Trace Bitmap to create vector paths; choose a tracing mode suited to the image, such as a brightness threshold for a high-contrast line drawing.
2. Move the traced paths aside to check them, then delete the original embedded bitmap. HPGL output should contain the paths, not the TIFF image.
3. Use Inkscape’s Extensions → Export → Plotter command, if available in your installation, and save the output as HPGL/PLT. Set the page or drawing dimensions for the target device.

For raster-to-vector controls and HPGL export in one application, Scan2CAD is a commercial Windows option: open the TIFF, run its raster-to-vector conversion, review the resulting vectors, then export as HPGL or PLT using the export options. Check the export scale and plotter settings before sending the file to a device.

Quality and compatibility

Tracing converts pixel boundaries into approximated paths; it does not preserve photographic color or shading as equivalent HPGL vectors. Clean, high-contrast line art generally traces better than photographs or noisy scans. Inspect paths for specks and broken lines, and check dimensions, scaling, and supported HPGL commands against the destination plotter or software.