H4 → HPG · Windows

Convert H4 to HPG

Batch convert H4 to HPG on an ordinary Windows PC. No GIS licence, no command line, the same settings applied to every file.

reaConverter transforms H4 files to HPG quickly and reliably. Drag in folders, set your options, click Convert, done. No cloud accounts, no file uploads, no complicated setup. Just install and start converting. Works without QGIS or ArcGIS, so GIS data can be converted on any office PC.

DownloadH4 to HPG ConverterConvert
H4 to HPG
Online
.h4.HPG
4.8

Converting files since 2001

Runs offline — nothing uploaded

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How to Convert Multiple .h4 Files to .hpg?

1. Download and Install reaConverter

Download reaConverter and install it in seconds. The setup is straightforward — no complex configuration, no extra software required.

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Install reaConverter

2. Load your H4 files

Load your H4 files into reaConverter. You can add individual files or point to folders, and the software will queue everything automatically.

Select H4s from a folder or drag-and-drop them directly into the reaConverter window.

Load your H4 files into reaConverter

3. Select HPG as output format

Pick HPG as output format and choose the destination folder where you want to save new .hpg files.

Select HPG as output format

4. Start H4 to HPG conversion

Press the Convert button and reaConverter takes care of the rest. Processing time depends on file size and volume.

Start Conversion

After processing, find all your new .hpg files in the output location. The log shows details for each conversion.

Step by step

How It Works

reaConverter offers the fastest, simplest solution for converting your H4 files into HPG without GIS software - all files processed on your PC for maximum privacy and speed.

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Technical note

H4 to HPG: what carries over and what does not

Geospatial coordinates are absolute positions on the earth, and they are large: a projected easting runs to six or seven digits, while latitude and longitude are small decimals. HPG expects a drawing laid out near its own origin in millimetres or inches. The geometry itself converts correctly, but it can land tens of kilometres from 0,0, or arrive at a scale where an entire county is forty units across. Zoom to extents first, then measure one known distance before dimensioning anything. An H4 file has a pixel count and a DPI value, and no real-world size at all. HPG is a drawing where one unit means one millimetre or one inch, so the conversion has to assign a scale. Set the DPI before the run rather than resizing afterwards, then measure one feature of known length in the output and scale the drawing once to match it. Everything downstream, from dimensioning to cutting, rests on that single check.

Map Data Workflow

Turn GIS data into something anyone can open

A map saved as HPG opens on any computer and any phone. reaConverter produces those from H4 in batch, entirely offline.

  • Render every file in a folder to HPG with the same size and settings
  • Set DPI and output dimensions before the run, not afterwards
  • Pick up new data automatically with Watch Folders, or script the job from the command line

Everything runs on your PC, which matters for cadastral, utility and client data that should not pass through an upload form.

GIS data conversion

User reviews

What people say after the first batch

Average User Rating:4.8
Last updated on September 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
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
So simple! I just needed to convert a couple of files to another format, and for such a straightforward task, the online converter worked perfectly — delivering the files I needed in no time. Excellent service!
Kenneth D. Carter
Kenneth D. Carter
Satisfied Customer
I run a small design agency, and reaConverter has saved me countless hours. The batch processing is lightning-fast, and the ability to convert hundreds of files into different formats at once is a game-changer. Highly recommend!
Mark T.
Mark T.
Satisfied Customer
Creating marketing materials for various platforms requires multiple file versions from single sources. reaConverter's workflow automation lets us generate PNG, JPEG, and SVG variants from AI and PSD files simultaneously. The color profile management ensures brand consistency across all outputs, and the processing speed allows for last-minute changes without delaying deadlines.
Rebecca Turner
Rebecca Turner
Marketing Agency CEO

FAQ

H4 to HPG Conversion

What are H4 files?

H4 is a file extension used for HDF4 (Hierarchical Data Format, Release 4), a general-purpose format for scientific data created at the National Center for Supercomputing Applications (NCSA) in the United States and now maintained by The HDF Group. A file works as a container in which many kinds of data are stored together with descriptions of what they are: large arrays of measurements, images with color palettes, tables, and notes. Because it is independent of the computer that created it, it became a favorite of researchers. In 1993, NASA chose HDF4 as the format for data from its Earth Observing System, and satellite products such as those from the MODIS instrument were distributed in it for many years. The same files often use the .hdf extension.

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 H4 to HPG?

Yes! reaConverter instantly converts .h4 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.

What is reaConverter used for?

reaConverter is a Windows converter for 800+ formats, GIS data among them. For H4 to HPG it replaces the usual detour through QGIS, ArcGIS or ogr2ogr: add the files, pick the output format, and the whole batch converts offline. Surveyors, planners and engineering teams use it to pass data between GIS, CAD and everyday document 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 H4 to HPG online?

If you only need to convert a few H4 files to HPG format, feel free to try our free online free online H4 to HPG converter — perfect for small batches with no installation needed!

How can I turn H4 files into HPG on my computer?

The best way to change H4s 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 H4 to HPG.

How can I automate H4 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 H4 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 h4 to hpg converter for batch processing.

What else can I do with reaConverter?

Convert PDF filesAdd watermark on imageConvert DICOM filesCrop photoConvert GIS files

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