GTL → FITS · Windows

Convert GTL to FITS

GTL to FITS converter that respects your privacy. No cloud uploads, no file size limits, just fast offline batch processing.

Batch GTL to FITS conversion doesn't have to be complicated. reaConverter processes entire folders with consistent quality settings. Works offline with no internet required, so you can convert anywhere, anytime.

DownloadGTL to FITS ConverterConvert
GTL to FITS
Online
GTLFITS
4.8

Converting files since 2001

Runs offline — nothing uploaded

Read what our users say →

How to Convert Multiple GTL Files to FITS?

1. Download and Install reaConverter

First, grab reaConverter from the download button below. Installation is fast, and the software runs offline — no account or signup needed.

reaConverter logo
Install reaConverter

2. Load your GTL files

Open reaConverter and import your .gtl files. No file limits, no slowdowns. Add as many as you need.

Drag files into the window, use the Add Files button, or select entire folders.

Load your GTL files into reaConverter

3. Select FITS as output format

Select FITS as target format and pick where to save results. You can keep default settings or fine-tune the output.

Select FITS as output format

4. Start GTL to FITS conversion

Hit Convert to process your files. The log window shows progress, timing, and status for every file.

Start Conversion

Conversion complete? Your FITS files are saved to the destination folder, ready to use.

Step by step

How It Works

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

Download reaConverter

Deep Customization

Do more with your files

Converting GTL 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

What people say after the first batch

Average User Rating:4.8
Last updated on August 22, 2026
reaConverter makes FITS conversion incredibly easy. We batch convert astronomical images to standard formats for presentations and analysis, all automated through the command-line. It’s fast, reliable, and handles large datasets without issues.
Laura N.
Laura N.
Astrophysics Research Assistant
Essential for our astroimaging pipeline! reaConverter perfectly handles FITS files from our research telescope, preserving all WCS coordinates and photometric data during batch conversion to TIFF. Now we process 100+ deep-sky exposures nightly without losing critical metadata for our exoplanet studies!
Joseph Wilson
Joseph Wilson
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
For agencies handling confidential data, reaConverter eliminates cloud-upload risks while delivering unmatched conversion reliability. Our team uses it both in-office and remotely with identical results.
Jamal Bailey
Jamal Bailey
Satisfied Customer
Our volunteer team uses reaConverter to prepare images for fundraising campaigns. The learning curve was minimal, and the results are professional-grade. The customer support team even helped us customize a workflow — fantastic service!
Jason P. Bailey
Jason P. Bailey
Non-Profit Coordinator
An ultra-fast solution for minimizing file sizes. The entire conversion process takes just 3 minutes!
Logan B.
Logan B.
Satisfied Customer

FAQ

GTL to FITS Conversion

What are GTL files?

The GTL extension is part of the Gerber group of formats, used as a standard in the fabrication of printed circuit boards (PCB). Gerber files contain 2D vector images that describe different data connected to PCB production, such as copper layers, solder masks, drilling or milling info. GTL files are created using Protel, a popular software for PCB layout design, and they describe the top copper layer.

What are FITS files?

The FITS (Flexible Image Transport System) format is a standard format used particularly for storing, transferring and processing scientific images from fields such as astronomy. FITS was first launched as an open standard in the early 1980s and has gone through several subsequent upgrades. FITS files contain not just images, but also data related to photometry and spatial calibration, and information about the origin of the image. Similar formats include FIT and FTS.

Can reaConverter convert GTL to FITS?

Yes! reaConverter instantly converts .gtl to .fits 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 GTL to FITS online?

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

How can I turn GTL files into FITS on my computer?

The best way to change GTLs to FITSs 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 GTL to FITS.

How can I automate GTL to FITS 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 GTL files to FITS using the command prompt?

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

What else can I do with reaConverter?

Convert RAW formatsConvert Gerber imagesChange image color spaceConvert CAD formatsSet file date

Related conversions

Other ways to convert GTL files, and other sources that convert to FITS.

GTL to JPGGTL to PNGGTL to PDFPLS to FITSSMB to FITSSMT to FITS
All GTL conversionsAll FITS conversions

Discover More

Beyond format conversion

Batch conversion, editing, and processing across 700+ formats, from RAW and HEIC to DICOM, DWG, and PDF. Everything runs locally, with no cloud and no upload limits.

DownloadreaConverterPurchase

Free trial · Windows 10/11 · v8.0.246 · Files never leave your computer

reaConverter software