Convert STX to PGM

STX to PGM made simple. Add files or folders, pick your settings, click Convert. reaConverter handles the rest — even thousands of files.

Tired of converting STX files one at a time? reaConverter processes entire folders to PGM automatically. Handles large batches reliably without crashes or timeouts.

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How to Convert Multiple STX Files to PGM?

1. Download and Install reaConverter

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

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Install reaConverter

2. Load your STX files

Launch reaConverter and drop in your STX files. The software queues everything for batch processing with consistent settings.

Add files by dragging them in, browsing folders, or using the right-click menu from Windows Explorer.

Load your STX files into reaConverter

3. Select PGM as output format

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

Select PGM as output format

4. Start STX to PGM conversion

Then simply press the Convert button and your conversion will begin in no time!

Start Conversion

Once the conversion is complete, you can find your PGM files in the destination folder you selected.

STX to PGM Converter

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

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Do more with your files

Converting STX 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.

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Image editing

User Reviews

Average User Rating:
Last updated on January 14, 2026
"Finally an app that actually opens my weird files! Saves me from format frustration daily."
Kyle Brooks
Kyle Brooks
Happy User
"This converter delivers exceptionally quick format conversions with reliable results every time."
Brian White
Brian White
Happy User
"Security was our top concern when evaluating file conversion tools. reaConverter’s offline mode and role-based access controls let us lock it down for sensitive environments. No unexpected network calls or bloat — just clean, fast conversions. Even passed our pen-testing scans without a hitch."
Marcus White
Marcus White
Healthcare IT
"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

STX to PGM Conversion: FAQ

What are STX files?

STX files represent RAW images created with SBIG CCD cameras. They are part of a group of formats known as Santa Barbara Instruments Astronomical Images, also including ST5, ST6, ST7 and ST8. Apart from astronomy, SBIG cameras can also be used in medical imaging, color photometry and a few other scientific and industrial sectors. All formats in the group are considered specialized and rare, so opening STX files might be possible only after conversion to more widely available extensions.

What are PGM files?

The PGM or Portable Graymap format is part of a package of open source graphics programs called Netpbm. Other Netpbm formats include PPM (Portable Pixmap) and PBM (Portable Bitmap), also known under the collective name of PNM (Portable Anymap). A PGM file includes a grayscale image, can work on a UNIX platform, as well as on Windows or Mac OS X, and can render a scope of up to 255 grayscale colors.

Can reaConverter convert STX to PGM?

Yes! reaConverter instantly converts .stx to .pgm 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 STX to PGM online?

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

How can I turn STX files into PGM on my computer?

The best way to change STXs to PGMs 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 STX to PGM.

How can I automate STX to PGM 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 STX files to PGM using the command prompt?

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

What else can I do with reaConverter?

Convert vector imagesConvert picture color spaceConvert DICOM imagesResize photoConvert GIS files

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