PDF Merge X: Merge PDF

PDF Merge X is your mobile editor for merging PDFs. Further you can add, delete, reorder, duplicate, and rotate pages in a PDF document.
*** The free version lets you edit and save two documents. Afterward, an upgrade to the pro version with a one-time in-app purchase is required to get unlimited edits. ***
The app offers the following features:
- Merge: Merge PDFs, single pages or multiple documents
- Add: Insert empty pages or pictures from the photo library
- Delete: Remove unnecessary pages
- Reorder: Change position of every page
- Duplicate: Copy/Clone single pages
- Rotate: Flip pages in steps of 90° angle
- Support for iCloud Drive and Files app
- Undo and redo support
- Open a PDF with PDF Merge X
- Sharing a PDF (Export)
- iTunes file sharing
- Built-in PDF previewer