This bookmarklet lets you upload an image on memories.undertale.com so you don't have to draw it on the site. Your images should be 50x50 and the color palette is very limited.
Drag this to your bookmarks bar, then go to memories.undertale.com, go to the "Determine your appearance" screen, and click the bookmark.
Import Undertale Memories Image
If you don't have a bookmarks bar, press Ctrl+Shift+B on Windows or Cmd+Shift+B on Mac to show it.