For the most part, HxD renders with GDI HDP rendering properly, but some of the (custom) rendering of the hex view does not and looks blurry when enabled, a few glitches happen as well.
To enable this for HxD Go to the Compatibility tab then set the setting to:
Set display scale anything other than 100% and it will have bugs.
It needs a new set of icons, for which I need a new license.
Delphi's VCL has several bugs for high DPI, new versions are 2000€ (Delphi Professional is the cheapest edition supporting the features that HxD needs).
It's more than a simple fix
In which language is HxD written?
Wonder if I can help in any way. The lack of HiDPI support will only be a growing pain moving forward as low DPI monitors are increasingly being phased out.
It's written in Delphi. The issue is the price of the current version, and the need for a new set of icons (for which I have certain requirements), and some of which I made myself, and would need to remake in higher res.