Why was the guillotine a more humane form of punishment?

Before the French Revolution, the executions were different whether you were a aristocrat or a common folk.

Depending on you social ranking, you were beheaded with an axe or a sWord, hung to death, drowned ...

The worst was the Wheel on which you were beaten to death by the executioner and sometimes by the crowd.

As a convinced revolutionary, Guillotin believed in equity and suggested the death penalty should be the same for everyone. He also wanted to make it as unpainful as possible.

His suggestion was adopted by the National Assembly at the end of 1789.

(but I will repeat : Guillotin did not invent the machine ....)

Take a look at this link

Who_invented_the_guillotine