720, 960, 2048 pixels wide

These are the optimal sizes for photos you upload to Facebook. I had no idea. I knew that FB automatically resizes and formats your photos, but did not know these were the magic numbers. Also:

  • Resize your photo to one of the following supported sizes:
    Regular photos: 720px, 960px, 2048px (width)
    Cover photos: 851px by 315px
  • If you use a 2048px photo, select the High Quality option when you upload
    To avoid compression when you upload your cover photo (emphasis mine), make sure the file size is less than 100KB
  • Save your image as a JPEG with an sRGB color profile

I copied the entire contents here, but the FB help link is at: https://www.facebook.com/help/266520536764594

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