Abstract The current study aimed at developing some EFL grammatical competence skills for second-year secondary school students through the use of Typographical input Enhancement based on Form Focused Instruction. Participants in the present study were (80) 2nd-year secondary school students at Nasr AbdElghafore School, Menouf, Al-Menoufia Governorate during the second term of the school year 2020–2021, were assigned into two groups: experimental (40) and control (40).  Study Instruments were an EFL pre- post-grammatical competence skills test and a rubric for scoring it. Findings of the study showed the effect of Typographical input Enhancement based on Form Focused Instruction in developing EFL grammatical competence skills.