Open .fit Files Online — Free FITS2 Viewer
Open FITS2 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 .fit File?
A .fit file is a image format known as FITS2. FITS Image (alt extension) This format is created by IAU and is widely used by photographers, designers, and developers.
FITS2 files contain structured image data that requires compatible software to open. With OpenAnyFile, you can view and edit .fit files directly in your browser without installing any software.
How to Open .fit Files Online
- Visit OpenAnyFile FITS2 page
- Drag and drop your .fit file onto the upload area, or click "Browse" to select it
- OpenAnyFile automatically detects the FITS2 format using magic byte analysis
- View, analyze, and view and edit your file contents in the browser
- Optionally convert to PNG, TIFF, JPG or download
Software That Opens .fit Files
.fit files are primarily created by IAU. In the image space, you may encounter .fit files from third-party tools, online converters, or export functions. Regardless of the source, OpenAnyFile handles them all.
Open .fit on Different Platforms
- Windows: Use the original software or upload to OpenAnyFile for instant access
- macOS: Preview may not support .fit — 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 .fit File Problems
Viewer compatibility
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 FITS2 to Other Formats
FITS2 files can be converted to 3 formats including PNG, TIFF, JPG.
Related Image Formats
If you work with .fit files, you may also encounter these image formats:
- APNG (.apng) — Open & convert .apng files online
- ARW (.arw) — Open & convert .arw files online
- AVIF (.avif) — Open & convert .avif files online
- BMP (.bmp) — Open & convert .bmp files online
- CIN (.cin) — Open & convert .cin files online
- CR2 (.cr2) — Open & convert .cr2 files online
- CR3 (.cr3) — Open & convert .cr3 files online
- CRW (.crw) — Open & convert .crw files online
- DDS (.dds) — Open & convert .dds files online
- DNG (.dng) — Open & convert .dng files online
Popular FITS2 Conversions
Frequently Asked Questions
What is a .fit file?
A .fit file is a image format called FITS2. FITS Image (alt extension)
How do I open a .fit file without installing software?
Upload your .fit file to OpenAnyFile. Our browser-based tool instantly detects and displays it — no downloads needed.
What program creates .fit files?
.fit files are typically created by IAU.
Can I convert .fit to another format?
Yes. OpenAnyFile converts .fit to PNG, TIFF, JPG.
Is it safe to open .fit files online?
Yes. OpenAnyFile processes files in a secure, isolated environment. Files are automatically deleted and all transfers use HTTPS.
Can I open .fit on my phone?
Yes. OpenAnyFile works on all mobile browsers including iPhone and Android.