Convert PRJ to HPG

PRJ to HPG with consistent quality. reaConverter handles 3D files in batch — perfect for collaboration across different software.

Got a folder full of PRJ files? reaConverter batch converts them to HPG in minutes, not hours. Local processing means instant results, even with thousands of files. 3D artists rely on it when clients need different file formats.

Download
reaConverter
Convert
PRJ to HPG
Online
PRJHPG

How to Convert Multiple PRJ Files to HPG?

1. Download and Install reaConverter

reaConverter installs quickly on any Windows PC. No dependencies, no bloatware — just a clean setup that's ready to use immediately.

reaConverter logo
Install reaConverter

2. Load your PRJ files

Add your PRJ files to reaConverter. Whether it's a handful or an entire archive, the batch engine processes them efficiently.

Browse for files, drag them in, or add entire folders at once. reaConverter queues everything automatically.

Load your PRJ files into reaConverter

3. Select HPG as output format

Pick HPG as the output format. Set the destination folder and optionally configure resolution, quality, or file naming.

Select HPG as output format

4. Start PRJ to HPG conversion

Start the conversion with one click. reaConverter handles everything and notifies you when it's done.

Start Conversion

When the batch finishes, your HPG files are ready in the destination folder you chose earlier.

PRJ to HPG Converter

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

Download Free Trial

Do more with your files

Converting PRJ files for use in a workflow? reaConverter offers many ways to process files, so you can customize them according to your requirements.

Our range of editing options includes auto-processing options such as auto-rotate, auto-crop, watermarking and more. Change Color Space, copy Metadata, set DPI, manage ICC Profile, control Bit Depth.

Conversion features
Image editing

User Reviews

Average User Rating:
Last updated on January 13, 2026
"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
"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
"An ultra-fast solution for minimizing file sizes. The entire conversion process takes just 3 minutes!"
Logan B.
Logan B.
Satisfied Customer
"I use the online converter — it’s quick and hassle-free!"
Jian Wong
Jian Wong
Happy Online User
"Working in a print studio means constantly juggling obscure file formats. I used to waste hours Googling converters or installing random software — until reaConverter became my Swiss Army knife. Install it once, and you're set forever. No internet? No problem!"
Helen Evans
Helen Evans
Satisfied Customer
"We deployed reaConverter across our department to standardize file formats for our archives. The command-line support and automation features integrated perfectly into our systems. Stellar performance and zero crashes—it just works."
David R.
David R.
IT Solutions Architect

PRJ to HPG Conversion: FAQ

What are PRJ files?

The PRJ extension is attached to project files created with 3D Studio, the predecessor of 3ds Max, created for operation on the DOS platform. PRJ is also known as a mesh file, containing graphical data related to geometry, texture, lighting and other relevant info associated to a 3D model.

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.

Can reaConverter convert PRJ to HPG?

Yes! reaConverter instantly converts .prj to .hpg 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 images directly from Windows Explorer using the right-click menu — fast and convenient.

Can I convert PRJ to HPG online?

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

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

The best way to change PRJs to HPGs 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 PRJ to HPG.

How can I automate PRJ to HPG 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 PRJ files to HPG using the command prompt?

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

What else can I do with reaConverter?

Convert DICOM filesResize pictureConvert RAW photo formatsConvert vector filesConvert picture color space

Find out more

Get advanced software for file conversion, processing, and editing, giving you complete, precise control over your work.
Download
reaConverter
Buy Now
reaConverter software