Open .fits Files Online — Free FITS Viewer
Open FITS File Online — Free & Instant
No signup required. Works in your browser.
📁 Drag & drop your file here
or click to browse • Max 100MB
✅ Free • ⚡ Instant • 🔒 Secure • 💻 No install
What Is a .fits File?
A .fits file is a science format known as FITS. FITS stores astronomical image and table data. This format is created by NASA/IAU and is widely used by professionals.
FITS files contain structured science data that requires compatible software to open. With OpenAnyFile, you can open and inspect .fits files directly in your browser without installing any software.
How to Open .fits Files Online
- Visit OpenAnyFile FITS page
- Drag and drop your .fits file onto the upload area, or click "Browse" to select it
- OpenAnyFile automatically detects the FITS format using magic byte analysis
- View, analyze, and open and inspect your file contents in the browser
- Optionally convert to PNG, JPG, CSV, TIFF or download
Software That Opens .fits Files
.fits files are primarily created by NASA/IAU. In the science space, you may encounter .fits files from third-party tools, online converters, or export functions. Regardless of the source, OpenAnyFile handles them all.
Open .fits on Different Platforms
- Windows: Use the original software or upload to OpenAnyFile for instant access
- macOS: Preview may not support .fits — use OpenAnyFile as a universal viewer
- Linux: Open-source alternatives exist, or use OpenAnyFile in any browser
- Mobile (iPhone/Android): OpenAnyFile works on all mobile browsers
Common .fits File Problems
Specialized format for astronomy.
Other common issues include: your OS not recognizing the file extension, the file appearing corrupted after download, or lacking the required software. OpenAnyFile bypasses all these issues with universal format detection.
Convert FITS to Other Formats
FITS files can be converted to 4 formats including PNG, JPG, CSV, TIFF.
Related Science Formats
If you work with .fits files, you may also encounter these science formats:
- HDF5 (.hdf5) — Open & convert .hdf5 files online
- MAT (.mat) — Open & convert .mat files online
- NETCDF (.nc) — Open & convert .nc files online
Popular FITS Conversions
Frequently Asked Questions
What is a .fits file?
A .fits file is a science format called FITS. FITS stores astronomical image and table data.
How do I open a .fits file without installing software?
Upload your .fits file to OpenAnyFile. Our browser-based tool instantly detects and displays it — no downloads needed.
What program creates .fits files?
.fits files are typically created by NASA/IAU.
Can I convert .fits to another format?
Yes. OpenAnyFile converts .fits to PNG, JPG, CSV, TIFF.
Is it safe to open .fits files online?
Yes. OpenAnyFile processes files in a secure, isolated environment. Files are automatically deleted and all transfers use HTTPS.
Can I open .fits on my phone?
Yes. OpenAnyFile works on all mobile browsers including iPhone and Android.