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
在处理天文图像数据时，FITS文件是业界标准，蕴含着星系的壮丽、星云的奥秘。然而，当您需要将这些宝贵的科学发现或观测记录，以一种更为传统、普遍接受的方式，例如传真（FAX）格式进行分享或归档时，直接转换往往会遇到兼容性难题。我们的工具专为此而生，旨在为您提供一个流畅、高效的解决方案，将复杂的FITS数据精准转化为简洁的FAX格式。无论您是科研工作者、天文爱好者，还是需要跨平台、跨设备传输图像的专业人士，我们都致力于让这一过程变得简单直观，确保您的数据在转换后依然保持其原始的清晰度与完整性。
- 科研机构内部文件共享
- 老旧设备兼容性传输
- 特定审批流程图像提交
在部分亚洲地区，传真文件（尤其是黑白图像）在行政审批和传统业务流程中仍有其特定应用场景，尤其是与一些历史悠久的系统或部门对接时。
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.