Collaborative writing is acknowledged as one of the most beneficial writing exercises for improving writing skills. This study aimed to look at the errors of online collaborative writing using Google Docs and face-to-face collaborative writing, as well as to find out how satisfied students were with both modes. Purposive sampling was used to pick 32 Thai second-year English major students (19 females, 13 males) from Writing II. A record form of the error kinds derived from Norrish (1983) a questionnaire, and a semi-structured interview were used as instruments. Frequency and percentage were the statistics used. The data revealed that 346 errors were discovered in online mode, while 389 errors were discovered in face-to-face mode, which was at a higher level. The most common types in the online mode were sentence fragments, while the most common kinds in the face-to-face mode were determiners. Grammars were presented to students in both modes, followed by lexis and mechanics. Furthermore, the findings indicated that the students reported being highly satisfied with online mode using Google Docs (X[bar]= 3.50), followed by face-to-face setting (X[bar]= 3.45). Students also had an overall positive feedback on Google Docs and found it useful in terms of writing anywhere and anytime. Based on the results of this study, students in online co-produced texts better than in face-to-face mode. Time independence and features of Google Docs might be the crucial factors which facilitated the students' writing in online mode.