Finalize order before adding numbers
If you add page numbers first and rearrange pages later, those old numbers move with the pages and may no longer match the new sequence. Finalize document order first.
Check for numbers already printed in the design
A source PDF may already contain numbers as part of the page design. Adding a second numbering layer can confuse readers, so inspect the top and bottom margins before applying new numbers.
Inspect the beginning, end, and moved boundaries
After reordering, open the first and last pages plus the pages around every important move. Then add numbering and check its position on a visually busy page.
Keep a copy before editing
Reordering and numbering produce new copies, which is useful. Keep the original until you have verified the new sequence and any internal references that depend on page numbers.
Recheck links, tables of contents, and written page references
If the document contains a table of contents, internal links, or text such as 'see page 12,' reordering can make those references stale even after you add a fresh visible page number. Inspect important navigation and update the source document when the page number is part of the written content itself. A visually correct footer number does not automatically repair semantic references inside the document.
Test numbering position on different page designs
Place the number on a text-heavy page, an image-heavy page, and a page with a busy header or footer before applying the choice to the whole document. A position that looks clean on one page may cover content on another. After numbering, scan several pages at normal viewing size and confirm that the number remains legible without interfering with text, crop marks, or existing footer elements.