Convert fits to heif
A browser can't do this one — here is what it can do.
Desktop app only
Nothing that runs in a tab can write heif from fits. This pair is waiting on the desktop build, which hands the job to the real command-line tools.
Browse what does workAbout FITS
Flexible Image Transport System
The standard data format in astronomy since 1981, storing images and tables behind plain-text headers that record telescope and observation details. Convert from FITS to get a viewable PNG or JPG of telescope data; convert to it for astronomy software.
About HEIF
High Efficiency Image File Format
An MPEG container standard (ISO/IEC 23008-12) from 2015 for single images and image sequences. It can hold HEVC, AV1 or other codecs, along with depth maps and bursts. Convert HEIF to JPG or PNG for apps and sites that cannot read it.