PDF Page Reorder

Implementation & Processing Pipeline

PDF page reordering modifies the document's page tree structure without altering page content. Pages are referenced by index, so reordering updates these references to reflect the new sequence.

This tool uses PDF-lib for PDF manipulation with a visual drag-and-drop interface for easy organization.

1. Parsing: The document structure is read into memory.
2. Restructuring: The Kids array (which defines page order) is shuffled based on your visual arrangement.
3. Saving: The file is rewritten with the new page order.

How It's Tested

We test the reordering engine to ensure no content is lost during the shuffle.

1. The "Reverse Order" Test:
   • Action: Reverse a 10-page document (Page 10 becomes Page 1).
   • Expected: The file opens correctly, and the first page visually matches the original last page.
2. The "Duplication" Check:
   • Action: Duplicate Page 1 five times.
   • Expected: The file size increases proportionally, and all 5 copies render identical content.
3. The "Mixed Operation" Stress Test:
   • Action: Move P1 to end, Delete P2, Duplicate P3.
   • Expected: The final document reflects all three operations accurately in a single save.
4. The "Annotation" Persistence:
   • Action: Reorder a page containing sticky notes or highlights.
   • Expected: The annotations must move with the page.

The History of Digital Collation

In the physical world, reordering meant shuffling papers. In the early digital PDF era, it meant complex "Cut and Paste" in expensive software. This tool brings the physical intuition of "shuffling papers" to the browser, allowing you to organize a PDF as easily as a deck of cards.

Reorder Operations