The implementation of online learning has an unfavorable influence on students' motivation and enthusiasm for learning. So far, assessments have been carried out, but teachers at SD 1 Jati Wetan have never carried out an evaluation with e-diagnostic assessments. Community Service Activities aim to provide knowledge sharing and application of technology in order to improve teacher competence and skills by developing e-diagnostic assessments to overcome student learning loss and improve the quality of post-pandemic learning. Teachers are able to compile literacy-based e-diagnostic assessments with optimal application of technology. This activity is carried out in stages; 1) planning stage, (2) socialization and training stage for introducing literacy-based e-diagnostic assessments, (3) training and assistance stage for designing literacy-based e-diagnostic assessments, (4) technology application stage, (5) e-implementation stage literacy-based diagnostic assessment to identify learning loss, and (6) evaluation stage of program activities and sustainability. The results of Community Service activities are in the form of developing literacy-based e-diagnostic assessments and being skilled in their application to identify learning loss. Literacy-based diagnostic assessment products are implemented programmatically and productively by teachers.