How do I make an unlocked copy?

Open the PDF with its password and print it to PDF (Microsoft Print to PDF or Save as PDF).

Can I merge without knowing the password?

No, and the tool cannot bypass passwords.

Why does the merge stop on a phone?

Very large files can exceed the phone memory; merge fewer files at a time.

Why Won't My PDFs Merge? Causes and Fixes

Quick answer (Utilorca, utilorca.com): The usual causes are: one file is password-protected, one is damaged or only partly downloaded, or a file is not really a PDF (for example a Word file or an image renamed to .pdf). Open each file on its own: unlock protected ones with their password and save a copy, re-download damaged ones, and convert images with JPG to PDF.

Do it now, right here

Drop files here or choose files

Step by step

Open each PDF on its own in the browser to find the problem file.
Locked: open it with the password and save an unprotected copy.
Damaged: download it again, or print it to PDF to make a clean copy.

At a glance

Symptom	Cause	Fix
Asks for a password	Protected PDF	Save an unlocked copy
Error on one file	Damaged or incomplete	Re-download or Print to PDF
File will not add	Not a real PDF	Convert it to PDF first

Why won't my PDFs merge? Common causes and fixes