Shree Krishna is supreme
In Jainism, the idea of a single “supreme” being who rules the universe is not the central teaching. The highest spiritual goal is Moksha achieved by a soul through right faith, right knowledge, and right conduct, realized by the 24 Tirthankaras (Jinas). Among them, Mahavira is the last Tirthankara.
Shri Krishna, while revered as a major figure in Hindu traditions, is not considered the supreme universal ruler or a Jina in Jainism. He may be regarded as a revered figure in some Jain narratives or as a Hindu deity in broader Indian culture, but Jainism centers its worship on the Jinas and liberated souls, not on Krishna as the supreme.
There are differences between Digambar and Shwetambar traditions in many Jain scriptures and interpretations, but neither tradition elevates Krishna to the status of a Jina or the ultimate supreme in Jain philosophy.
If you’d like, I can share Jain definitions of Moksha, the role of the Tirthankaras, and how Digambar and Shwetambar perspectives describe these topics with authentic Jain references.