How to Convert Multiple FIT Images to AVIF?
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. Apply image edits like resize, crop, or color adjustment while converting.
2. Load your FIT files
Start reaConverter and add your .fit files. The software processes everything locally, so your files never leave your computer.
Use drag-and-drop, folder browser, or right-click conversion from Explorer.
3. Select AVIF as output format
Select AVIF from 700+ supported output formats. Choose your destination folder and adjust settings to match your needs.
4. Start FIT to AVIF conversion
Click Convert to start the batch. reaConverter processes files quickly and shows you the status of each one.
Once done, reaConverter shows a summary. Click 'Show converted files' to jump straight to your AVIF output.
Before you convert FIT to AVIF
FIT stores 32-bit greyscale covering the full dynamic range of the scan, and AVIF shows 8 bits. The conversion applies a window level, so what ends up visible depends on the window you choose. Decide separately whether patient metadata should be copied to the output or stripped from it. FIT stores pixels without compression loss and AVIF does not, so this is a one-way step. Choose a high quality setting, and avoid converting the same file back and forth, because each pass compounds the artefacts.
