The present study evaluated the effects of web-based training on Spanish pre-service and in-service teacher knowledge and implicit beliefs on learning to write. A sample of pre-service teachers and in-service teachers from Mexico, Guatemala, Ecuador, Colombia, and Spain participated in the online course. Findings suggest that teachers may improve their knowledge of transcription skills (i.e., handwriting/typing, spelling), text production, and strategies for composing as necessary components of quality writing instruction. Effects were also found on the teachers' implicit beliefs. Finally, both pre-service and in-service teachers positively rated the online course received.