from a saved video
- open a saved video.
- tap the gif button in the bottom bar.
- choose the part you want. a gif can be up to 10 seconds.
- save it. the gif is added to your iphone's photos.
gifs from x and reddit
gifs on x are saved as short looping videos that play silently. a gif in a reddit comment is saved too. both can be saved to your photos as real gifs with the save button.