Signed vs Unsigned Hex: The Difference That Breaks Debug Sessions

The value FFFFFFFF can represent 4294967295 or -1. Both are correct. The deciding factor is the system that produced the value and the width you are using to interpret it.

Unsigned interpretation

Unsigned values treat every bit as magnitude. This is common when you are dealing with raw addresses, colors, or identifiers.

Signed interpretation

Signed values use a high bit to signal negativity in two’s complement systems. That is why the same hexadecimal sequence can map to a negative decimal result.

Best practice

Always pair the conversion with the bit-width assumption and intended context. Without that, teams may argue about arithmetic when the real issue is interpretation.