The 25th Australasian Document Computing Symposium (ADCS 2021) took place as a virtual seminar series from December 2021 through to February 2022, co-hosted by the University of Melbourne and RMIT University, and held in cooperation with ACM SIGIR. Five sessions were dedicated to presenting and discussing nine accepted research papers, book-ended by opening and closing keynotes. The virtual nature of ADCS 2021, coupled with free registration, attracted a broader audience than usual, with 110 registrants from 16 countries including those outside of Australia and New Zealand.