FITS to TIF Converter
Processing entirely on your device — large files may take a moment.
Flexible Image Transport System and Tagged Image File (TIF) exist for different jobs: FITS (Flexible Image Transport System) is the data format of professional astronomy — every image carries a human-readable header with telescope, exposure and world coordinates alongside the raw pixel data. Files ending in .tif convert exactly like .tif → everything TIFF does, this does.
This converter runs entirely in your browser using WebAssembly — your files never leave your device, nothing is uploaded, and there are no watermarks, sign-ups or queues. Drop in several files at once to convert them as a batch.
How FITS compares to TIF
| FITS | TIF | |
|---|---|---|
| Compression | None (optionally Rice/GZIP) | Lossless (LZW/ZIP) or none |
| Transparency | Not supported | Supported (alpha channel) |
| Animation | Not supported | Not supported |
| Metadata | Rich text header (WCS) | Rich tag system (EXIF, GeoTIFF) |
| Best for | Telescope frames, science data | Print, scanning, archival |
How to convert FITS to TIF
- 1
Select your files
Drag & drop your FITS files onto the area above, or click to browse. You can add multiple files at once for batch conversion.
- 2
Convert instantly
Click "Convert to TIF". The conversion runs entirely inside your browser using WebAssembly — no upload, no queue, no waiting.
- 3
Download results
Download each converted TIF file individually, or grab everything at once as a ZIP archive.
About the FITS format
FITS (Flexible Image Transport System) has carried professional astronomy data since 1981: every file opens with a plain-text header that records telescope, instrument, exposure, filters and world coordinates, followed by raw pixel arrays — often 16-bit or float, sometimes data cubes.
Values can be negative or far above display range, so FITS never looks right in a photo viewer. Converting to PNG applies a simple scaling pass that reveals the nebula or galaxy in the numbers — good for previews, while science pipelines keep the original.
+Strengths
- ✓Self-documenting science headers
- ✓High bit depth (16/32-bit, float)
- ✓The standard of every observatory
!Limitations
- −Not display-ready
- −Files are large and uncompressed
About the TIF format
TIFF, introduced by Aldus in 1986 and maintained by Adobe since, is the workhorse of the scanning, printing and archiving industries. It is a tag-based container: baseline RGB, CMYK, grayscale and indexed color, compressed with lossless LZW or ZIP (or not at all), with 8- or 16-bit depth and even multiple pages in a single file. A scanned contract or a print-ready magazine page lives in TIFF.
Its historical weakness is dialect fragmentation: the tag system is so flexible that exotic TIFFs — GeoTIFFs, fax TIFFs, certain 16-bit CMYK variants — still trip up careless readers. Files are huge, and no browser displays TIFF natively, so it never escaped its professional niches.
+Strengths
- ✓Lossless with up to 16-bit-per-channel depth
- ✓Multipage support — one file, many scans
- ✓CMYK and print-industry color handling
- ✓Rich, extensible tag metadata for archiving
!Limitations
- −Very large files, even compressed
- −Dialect fragmentation trips up simple readers
- −No native browser display
Why convert FITS to TIF?
There is a concrete reason this conversion exists: Not display-ready TIF sidesteps that — Lossless with up to 16-bit-per-channel depth If that is your situation, the tool above settles it in seconds, entirely on your device.
Frequently asked questions
Is this FITS to TIF converter really free?
Yes — completely free, with no sign-up, no watermark and no daily conversion limits. The site is supported by advertising.
Are my files uploaded to a server?
No. The conversion runs entirely inside your browser using WebAssembly, so your files never leave your device — that is what makes it instant and private.
Does it work on Windows, Mac, iPhone and Android?
Yes. Anything with a modern browser works: Windows, macOS, Linux, Android and iOS. No software installation is required.
Will I lose quality converting FITS to TIF?
No — TIF is a lossless format, so every pixel of the converted image matches your original FITS file. You can also adjust the quality/size balance before converting when the target format supports compression.
Can I convert several FITS files at once?
Yes — drop as many files as you like into the tool and they are converted in one batch. When more than one file comes out, everything is bundled into a ZIP for a single download.
Will transparent areas survive the conversion to TIF?
Transparency is kept whenever TIF actually supports an alpha channel. If the target format has none (like JPG), transparent areas are flattened onto a white background — that is a property of the format, not of this tool.