CAL to FITS for Image Workflows
Fast, instant CAL (CALS) to FITS conversion. No signup required. Just drop your .cal file and get .fits in seconds.
Batch Settings
在处理天文数据时，文件格式的转换常常是绕不开的一环。CAL文件，作为某些特定天文软件或设备生成的校准数据，虽然在源头端发挥着关键作用，但在更广泛的分析、共享或存档场景中，其通用性却远不如FITS（Flexible Image Transport System）格式。FITS以其强大的元数据支持和跨平台兼容性，已成为天文学界公认的标准。本工具旨在帮助您无缝地将CAL数据转换为FITS格式，确保您的宝贵观测数据能在主流天文软件中畅通无阻地被读取、处理和可视化，让您的研究成果得以更高效地流通与应用。无论是个人爱好者还是专业研究人员，都能在这里找到便捷的解决方案，让数据转换不再是技术障碍。
- 天文社群数据分享
- 教学演示与科研合作
- 移动端观测结果快速查看
在华人地区，特别是高校和科研机构，FITS格式是天文数据交换的绝对主流。CAL文件在一些早期或特定国产设备中偶有出现，但最终都会转换为FITS以方便后续处理与国际接轨。
About CAL (CALS) to FITS Conversion
Whether you're one of the many photographers, designers, and content creators who work with CAL files daily, there comes a time when you need FITS instead. CAL is a widely used file format.
Here's a typical scenario: you receive a .cal file but your project, platform, or client requires .fits. FITS is a widely used file format. Rather than searching for desktop software or wrestling with command-line tools, you can convert CAL to FITS online in seconds with CocoConvert.
This conversion is ideal when you When you need a FITS file. The conversion helps you convert between formats quickly.
Converting CAL to FITS maintains high quality with CocoConvert's optimised encoder settings.
Behind the scenes, CocoConvert uses industry-standard tools — FFmpeg for audio and video, Sharp for images, qpdf for documents. Your file is uploaded securely (TLS encryption), processed on isolated servers in Germany, and auto-deleted within 24 hours. No account, no watermark, no hidden fees.
Power users can batch convert up to 100 files simultaneously with a Pro subscription, making it practical for production workflows.
How to Convert CAL (CALS) to FITS
- 1
Drop your file
Drag your .cal file onto the converter. Need to process many files? Add up to 5 at once (100 for Pro).
- 2
Set output to FITS
Pick FITS from the format list. The converter automatically tunes settings for the CAL→FITS pair.
- 3
Hit Convert
Processing happens server-side — your browser stays responsive. Most image files convert in under 10 seconds.
- 4
Download and use
Your .fits file is ready to plug into your workflow. Download it or share the link (expires in 24 hours).
What Happens When You Convert CAL (CALS) to FITS
Your CAL file is decoded and re-encoded as FITS.
Your CAL 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
CAL (CALS)
.cal file
| Extension | .cal |
| MIME Type | image/x-cals |
| Category | Image |
FITS
.fits file
| Extension | .fits |
| MIME Type | image/fits |
| Category | Image |
Should You Convert CAL (CALS) to FITS?
When to Convert
- ✓When you need a FITS file
Frequently Asked Questions
Who needs to convert CAL to FITS?
This conversion is commonly used by photographers, designers, and content creators. Typical reasons include convert between formats quickly and ensuring compatibility with downstream tools or platforms.
Can I convert CAL to FITS without losing quality?
Converting CAL to FITS maintains high quality with CocoConvert's optimised encoder settings.
Do I need to install software to convert CAL to FITS?
No. CocoConvert runs entirely in your browser — no downloads, no plugins. It works on macOS, Windows, Linux, iOS, and Android.
How many CAL files can I convert at once?
Free users can convert up to 5 files per hour. Pro subscribers get 100 files per hour with larger size limits (5 GB per file). Business API users can integrate batch conversion directly into their tools.
Is there an API for CAL to FITS conversion?
Yes. CocoConvert offers a Business API for automated conversions. It supports all the same format pairs available in the web interface, including CAL to FITS.
Versions are pinned in our worker Dockerfile and re-built via CI on every change.