Convert xpm 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 xpm. This pair is waiting on the desktop build, which hands the job to the real command-line tools.
Browse what does workAbout XPM
X PixMap
The color successor to XBM, storing an image as a C array of strings with a text color table. Early Linux and Unix desktops used it for icons. Use it for X11 programs and older Linux desktops that expect XPM icons.
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.