FITS Won't Open? Convert to FAX Instantly
Fast, instant FITS to FAX conversion. No signup required. Just drop your .fits file and get .fax in seconds.
Batch Settings
天文学の観測データに用いられるFITSファイルは、その精密さゆえに専門的なソフトウェアが不可欠です。しかし、ビジネスの現場や一般のご家庭で、手軽に内容を確認したり、共有したりしたい場面も少なくありません。特に、かつての日本のビジネスシーンを支えたFAXは、今なお特定の業界で現役であり、その手軽さが見直されています。FITSファイルで記録された星々の煌めきや広大な宇宙の画像データを、誰もが扱いやすいFAX形式へ変換することで、情報共有の幅は格段に広がります。このページでは、複雑なFITSデータを、日本の伝統的な情報伝達手段であるFAXとしてスムーズに変換し、より多くの人々とその価値を分かち合うためのお手伝いをいたします。専門知識がなくても、FITSの魅力を手軽にFAXで送り、受け取ることができるようになります。
- 天文イベントの広報資料
- 研究機関間のデータ共有（旧式機器対応）
- アート作品としてのFAX出力
日本では、企業間取引においてFAXが依然として重要な連絡手段となることがあり、FITSのような特殊な画像データもFAX形式に変換して送付する必要が生じる場合があります。特に、書面でのやり取りを重視する文化が背景にあります。
About FITS to FAX Conversion
Dealing with a FITS file that won't open on your device? You're not alone — FITS compatibility issues are one of the most common reasons people search for a file converter. FITS is a widely used file format.
The fix is simple: convert your FITS to FAX. FAX 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 FITS to FAX maintains high quality with CocoConvert's optimised encoder settings.
CocoConvert processes your FITS 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 FAX 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 FITS to FAX
- 1
Add your FITS file
Drag and drop your .fits file into the converter, or tap "Browse" to pick it from your device. Multiple files are supported for batch processing.
- 2
Pick FAX output
Select .fax 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 .fax file. For batch jobs, download all at once as a zip.
What Happens When You Convert FITS to FAX
Your FITS file is decoded and re-encoded as FAX.
Your FITS file is uploaded and validated
The file is decoded (parsed into its raw data)
The data is re-encoded in FAX format
The converted file is ready for download
Format Comparison
FITS
.fits file
| Extension | .fits |
| MIME Type | image/fits |
| Category | Image |
FAX
.fax file
| Extension | .fax |
| MIME Type | image/g3fax |
| Category | Image |
Should You Convert FITS to FAX?
When to Convert
- ✓When you need a FAX file
Frequently Asked Questions
Why won't my FITS file open?
FITS files may not open if your device lacks the right codec or application. Converting to FAX — a more widely supported format — usually resolves this. FAX is a widely used file format.
Is it safe to convert FITS to FAX 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 FITS to FAX?
Converting FITS to FAX 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 FITS 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 FITS to FAX 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.