A multi-mode scanner comprises a first body, a second body and a scanning module. The first body connected to the second body has connected first and second sides. A passageway accommodating a first portion of a bent document is formed between the first and second bodies. A second portion of the bent document is connected to the first portion of the bent document and supported by a second side of the first body. The first and second bodies are configured such that a weight of the bent document makes the second portion be in flat surface contact with the second side, or makes the first portion be in flat surface contact with first side. The scanning module disposed in one or both of the first and second bodies performs an image scan operation on the first portion of the bent document in the passageway to obtain an image signal.