If you need a white border when you Develop photos in Lightroom Classic to share to Instagram, follow the steps below.

  1. In Lightroom Classic, choose a photo.
  2. Crop the photo with any of the Instagram aspect ratios (4 x 5, 1.91 x 1, or 1 x 1).
  3. Go to Print.
  4. Under User Templates, choose the appropriate template for the aspect ratio.
  5. Adjust Stroke Border to achieve your desired width of the border.
  6. Click “Print to file…”
  7. Give a new name for the file.

If you want to create the white border templates in Lightroom, see Create a white border for your photo in Lightroom Classic.

References

Phil Ebiner. (2017, August 19). How to Easily Add a Border in Lightroom. https://www.youtube.com/watch?v=oHnG6xEnsrY