Are you trying to print your photo in exact size? Or you just need to resize it correctly so you can upload it to websites?
This app will help you:
◆ Precisely resize your photos in any metric including: pixel, centimeter, millimeter, inch, point and pica
◆ Change image resolution in dpi (pixel per inch) or pixel percentimeter
◆ Crop, rotate or flip in any direction
◆ Print photos in exact size. Just send it over AirPrint or export as PDF.
◆ Save photo in any format including: PNG, JPEG, HEIF and TIFF
Resize Pro Subscription:
• You can subscribe to unlock Pro features and unlimited access.
• Subscription auto-renew at the end of current period, unless cancelled 24-hours in advance prior to the end of the current period. The subscription fee is charged to your iTunes account at confirmation of purchase. You may manage your subscription and turn off auto-renewal by going to your Account Settings after purchase. Per Apple policy, no cancellation of the current subscription is allowed during active subscription period. Once purchased, refunds will not be provided for any unused portion of the term.