On iPad you can display two documents side by side to compare them.

  1. Tap on the Side by Side button. Tap Side by Side button in PDF Pro on iPad
  2. Tap on the left Open button. Tap left Open button in split view on iPad
  3. Select a document. Select first document from library on iPad
  4. Tap on the right Open button. Tap right Open button in split view on iPad
  5. Select a document. Select second document from library on iPad
  6. Now you can read, edit or compare these two documents. Two PDF documents displayed side by side on iPad