How to convert .mp4 videos to .h263 format.
Converting MPEG-4 Videos directly to H.263 Videos (.mp4 to .h263 conversion) is certainly possible and very straightforward.
Use one of several video editing programs or (online) conversion tools, such as the Freemake Video Converter or FFmpeg, which allow users to import MP4 videos and export them in H263 format.
Video converting software