You can easily resize video for Instagram Story, Instagram Feed, or Instagram TV on iPhone, Android, or PC using Media.io Resize Video. Here are the steps: step 1. upload your video on Media.io Resizer and then add it to the timeline; step 2. Edit your video by cropping, zooming, panning, splitting, trimming, and so on; step 3. Set the aspect ratio as 9:16 (Instagram Story), 1:1 (Instagram Feed), or 4:5 (Instagram TV). Finally, tap Export.