GIF to MP4 converter
You can also use: https://ezgif.com/gif-to-mp4?url=http://link/to/image.gif
Output MP4 video:
Online GIF to MP4 converter
Convert animated GIF to MP4 video with a single click. Upload a GIF or paste image url and this tool will output MP4 file. Fast, free online tool with no watermarks.
You can also use GIF to WebM converter instead.