Check first
Check these three things first
- Page order is wrong or pages are duplicated: almost always the order in the list, not the merge itself.
- Bookmarks disappeared: many online tools rebuild the document page by page and lose the outline.
- The final file doubled in size: a sign that pages were turned into images instead of being copied.
How to fix
How to fix it
Use the local merge tool: the file is read and assembled in the tab without being uploaded. Bookmarks from every document are copied and re-pointed to the new page numbers, page labels and metadata survive, and pages are copied rather than re-rendered, so text stays selectable and images are not recompressed.
Merge the PDFs locallyFAQ
Frequently asked questions
Can a password-protected PDF be merged?
Remove the protection in your PDF reader first, then merge the unlocked copy: an encrypted file cannot be opened without its password.
Do forms stay fillable after merging?
No. A PDF can hold only one form for the whole document, so fields do not survive the merge even when the pages do.