HPG → STP · Windows

Convert HPG to STP

HPG to STP with consistent quality. reaConverter handles 3D files in batch, which helps when teams run different software.

Tired of converting HPG files one at a time? reaConverter processes entire folders to STP automatically. Handles large batches reliably without crashes or timeouts. Handles 3D models independently with no CAD software required.

DownloadHPG to STP ConverterConvert
HPG to STP
Online
.hpg.STP
4.8

Converting files since 2001

Runs offline — nothing uploaded

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How to Convert Multiple .hpg Files to .stp?

1. Download and Install reaConverter

reaConverter is a standalone Windows app — download, install, and start converting HPG files in under two minutes.

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Install reaConverter

2. Load your HPG files

Add HPG files to reaConverter. One file or a thousand, the process is the same. Everything runs locally on your machine.

You can drag-and-drop files, browse to a folder, or add entire directory trees including subfolders.

Load your HPG files into reaConverter

3. Select STP as output format

Select STP from the output format list and set your destination folder. You can also adjust quality and compression settings.

Select STP as output format

4. Start HPG to STP conversion

Click the Convert button to start. reaConverter will process all your files with the settings you selected.

Start Conversion

When finished, your new .stp files will be waiting in the destination folder.

Step by step

How It Works

reaConverter offers the fastest, simplest solution for converting your HPG files into STP in seconds - all files processed on your PC for maximum privacy and speed.

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Technical note

Before you convert HPG to STP

HPG is flat, so the conversion builds depth by extrusion: every closed outline is lifted to one height, set in millimetres in the 3D formats loading settings. An open line has no area to lift, so a drawing meant for extrusion needs closed contours. Every shape gets the same height, which suits plates, signs and logos, while parts at different heights need separate runs.

3D Workflow

From flat drawing to 3D model

reaConverter turns HPG outlines into STP models by extrusion, so a flat shape becomes a 3D part in one step.

  • Set the extrusion height in millimetres before the run
  • Script the job from the command line for pipelines and scheduled runs
  • Apply the same height to every file in the batch
Supported 3D formats
3D model conversion

User reviews

What people say after the first batch

Average User Rating:4.8
Last updated on September 28, 2026
reaConverter handles HPG files flawlessly. I use it to convert plot files to PDF for approvals, and the output is always accurate. The automation through Watch Folders and command-line is a big plus for speeding up our workflow.
Daniel M.
Daniel M.
Mechanical Engineer
Finally, an HPG Converter That Just Works! Last week, we processed 237 HPG blueprints in 18 minutes. Previously, this took half a workday!
Kevin Nguyen
Kevin Nguyen
Satisfied Customer
An efficient all-in-one solution for image conversion and light editing, designed for maximum user-friendliness.
Elena Anderson
Elena Anderson
Happy User
Enable shell integration for lightning-fast file conversions directly from Windows Explorer.
R. Lewis
R. Lewis
Happy User
After 200+ conversions on my budget laptop (i3-1115G4/4GB RAM/Win11), reaConverter outperforms heavyweight tools. Zero crashes, low CPU usage during batch processing, and no internet dependency - exactly what professionals need.
Walter Morgan
Walter Morgan
Satisfied Customer
An excellent program! I use it regularly in my work - it supports nearly every file format imaginable. The interface is intuitive and runs flawlessly every time.
Roger Cook
Roger Cook
Happy User

FAQ

HPG to STP Conversion

What are HPG files?

HPG is a vector image format created in a standard programming language called HPGL (Hewlett-Packard graphics language). Other extensions created in this language include PLT, HP2 and PL2. All are called "plotter files" and are created by drawing programs such as AutoCAD to be printed using a device specialized in vector graphics. An HPG file uses a line series of two-letter codes to render an image and can also include parameters.

What are STP files?

STP is a file format used by popular CAD software. STP contains 3-dimensional data saved in the Standard for the Exchange of Product Data (STEP, ISO 10303) file format.

Can reaConverter convert HPG to STP?

Yes! reaConverter instantly converts .hpg to .stp with perfect quality preservation. With its batch processing feature, you can convert multiple files at once in just a few clicks. You can even convert HPG files directly from Windows Explorer using the right-click menu — fast and convenient.

What is reaConverter used for?

reaConverter is a Windows converter for 800+ formats, 3D models among them. For HPG to STP it replaces the round trip through Blender, a CAD program or an upload form: add the files, pick the output format, and the whole batch converts offline. Engineers, 3D printing shops and product teams use it to move models between CAD, printing, web and documentation formats.

Why choose offline conversion with reaConverter?

reaConverter is a software program that is used for offline files conversion. Your proprietary documents never leave your computer – essential for architects, engineers, healthcare and government contractors handling classified projects. Meets GDPR, HIPAA, CCPA, and corporate security policies by ensuring files never cross borders or third-party systems.

Can I convert HPG to STP online?

If you only need to convert a few HPG files to STP format, feel free to try our free online free online HPG to STP converter — perfect for small batches with no installation needed!

How can I turn HPG files into STP on my computer?

The best way to change HPGs to STPs on your PC is to install a quality piece of software, such as reaConverter. This software is extremely efficient in managing a wide range of batch files conversions, including conversion from HPG to STP.

How can I automate HPG to STP files conversion?

reaConverter supports all the most useful automation features such as right-click сonversion and Watch Folders for the most efficient automated files conversion in any software of this type.

Is there a way to convert HPG files to STP using the command prompt?

reaConverter provides full access to all its features via Windows command line, including a high-performance command-line hpg to stp converter for batch processing.

What else can I do with reaConverter?

Convert whole-slide imagesResize picturesConvert RAW photo formatsConvert Gerber imagesConvert picture color space

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Beyond format conversion

Batch conversion, editing, and processing across 800+ formats, from RAW and HEIC to DICOM, DWG, and PDF. Everything runs locally, with no cloud and no upload limits.

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