Pix42
Inspect FITS data without switching tools
FITS files need more than a generic image preview. Pix42 provides an astronomy-aware viewing path with interactive stretch controls, making it easier to inspect faint structures and tune the visible range for scientific imagery.
Pix42 comes from the same team behind FITS Liberator work, and adds FITS support inside a broader image viewer that also handles RAW, TIFF, OpenEXR, JPEG XL, AVIF, HEIC, and standard media folders.
A FITS viewer inside a general image workflow
Pix42 is useful when astronomy files live beside exports, reference images, PNGs, JPEGs, videos, notes, or archives. You can browse the whole folder and open specialist formats from one application.
Pix42 includes this feature together with fast browsing, persistent ratings, duplicate detection, metadata tools, and batch conversion.
Open FITS files in Pix42.
Download Pix42 for Windows and macOS and try the scientific image workflow.