How to Convert Multiple HEIC Images to FITS?
1. Download and Install reaConverter
First, grab reaConverter from the download button below. Installation is fast, and the software runs offline — no account or signup needed. You can also resize, crop, and adjust images during conversion.
2. Load your HEIC files
Open reaConverter and import your .heic files. No file limits, no slowdowns. Add as many as you need.
Drag files into the window, use the Add Files button, or select entire folders.
3. Select FITS as output format
Select FITS as target format and pick where to save results. You can keep default settings or fine-tune the output.
4. Start HEIC to FITS conversion
Hit Convert to process your files. The log window shows progress, timing, and status for every file.
Conversion complete? Your FITS files are saved to the destination folder, ready to use.
What changes when you convert HEIC to FITS
HEIC can carry an alpha channel and FITS cannot. Transparent areas are composited onto a solid background during conversion, so pick that background colour deliberately: white is the default, and it is rarely the right choice for a logo that will sit on a dark page. FITS is lossless, so nothing further is discarded during conversion. What it cannot do is restore detail that HEIC compression already removed, and the output file will usually be considerably larger.
