Optical Mark Recognition (OMR) is often used by teachers to help mark students’ test in the form of multiple-choice test. This article describes how to build an offline OMR system which run in Android based smartphone. The input is the digital image of student’s answer sheet which was taken from smartphone’s camera. The system implements image processing techniques to detect and determine not only student’s handwritten for his/her ID, name, and form’s ID, but also for the answer of each test number. Grad…