G3 Won't Open? Convert to FITS Instantly
Fast, instant G3 (FAX) to FITS conversion. No signup required. Just drop your .g3 file and get .fits in seconds.
Batch Settings
La conversion de fichiers est une tâche courante, mais parfois complexe, surtout lorsque l'on passe de formats établis à des standards plus spécifiques. Le passage du format G3, souvent associé aux télécopies et aux documents scannés en noir et blanc, vers le format FITS, largement utilisé en astronomie et dans l'archivage de données scientifiques, peut sembler singulier de prime abord. Pourtant, cette transition répond à des besoins précis : elle permet de "libérer" des informations contenues dans des images G3 pour les intégrer à des systèmes d'analyse ou de stockage qui requièrent la robustesse et la richesse métadonnées du FITS. Notre outil est conçu pour faciliter cette opération, en garantissant l'intégrité de vos données et en optimisant le processus de transformation. Que vous soyez un professionnel de l'archivage, un chercheur ou un passionné, nous vous accompagnons dans cette démarche de conversion.
- Archivage de documents administratifs historiques
- Numérisation de publications scientifiques anciennes
- Intégration de schémas techniques en CAO
En France et en Belgique, l'utilisation du G3 reste présente pour certains fonds d'archives hérités de l'ère des télécopieurs, rendant la conversion vers des formats plus pérennes comme FITS pertinente pour la conservation à long terme et l'interopérabilité avec les systèmes de recherche modernes.
About G3 (FAX) to FITS Conversion
Dealing with a G3 file that won't open on your device? You're not alone — G3 compatibility issues are one of the most common reasons people search for a file converter. G3 is a widely used file format.
The fix is simple: convert your G3 to FITS. FITS is a widely used file format. This conversion lets you convert between formats quickly, solving the problem in seconds rather than hours of troubleshooting.
Converting G3 to FITS maintains high quality with CocoConvert's optimised encoder settings.
CocoConvert processes your G3 file on secure servers in Germany — upload, convert, download. Your files are encrypted via TLS and automatically deleted within 24 hours. No account needed, no software to install, and it works on any device with a browser.
This conversion is ideal when you When you need a FITS file.
The conversion engine behind CocoConvert uses FFmpeg, Sharp, and qpdf — the same open-source libraries trusted by Netflix, YouTube, and enterprise platforms. Pro users can batch convert up to 100 files at once.
How to Convert G3 (FAX) to FITS
- 1
Add your G3 file
Drag and drop your .g3 file into the converter, or tap "Browse" to pick it from your device. Multiple files are supported for batch processing.
- 2
Pick FITS output
Select .fits as the target format. CocoConvert automatically applies the best quality settings for this conversion.
- 3
Start conversion
Hit the Convert button. The image engine processes your file server-side — no CPU drain on your device.
- 4
Save your file
Once done, download your .fits file. For batch jobs, download all at once as a zip.
What Happens When You Convert G3 (FAX) to FITS
Your G3 file is decoded and re-encoded as FITS.
Your G3 file is uploaded and validated
The file is decoded (parsed into its raw data)
The data is re-encoded in FITS format
The converted file is ready for download
Format Comparison
G3 (FAX)
.g3 file
| Extension | .g3 |
| MIME Type | image/g3fax |
| Category | Image |
FITS
.fits file
| Extension | .fits |
| MIME Type | image/fits |
| Category | Image |
Should You Convert G3 (FAX) to FITS?
When to Convert
- ✓When you need a FITS file
Frequently Asked Questions
Why won't my G3 file open?
G3 files may not open if your device lacks the right codec or application. Converting to FITS — a more widely supported format — usually resolves this. FITS is a widely used file format.
Is it safe to convert G3 to FITS online?
Yes. CocoConvert encrypts your file via TLS, processes it on isolated servers in Germany, and permanently deletes it within 24 hours. Your files are never shared or analysed.
Will I lose quality converting G3 to FITS?
Converting G3 to FITS maintains high quality with CocoConvert's optimised encoder settings. CocoConvert uses high-quality encoder defaults to preserve as much fidelity as possible.
How large can my G3 file be?
Free users can convert files up to 250 MB each. Pro users get a 5 GB limit per file, and Business API users have custom limits.
Can I convert G3 to FITS on my phone?
Absolutely. CocoConvert works in any modern browser — iOS Safari, Android Chrome, and all desktop browsers. No app required.
Versions are pinned in our worker Dockerfile and re-built via CI on every change.