Remove password restrictions first, then combine — everything runs in your browser
Files with owner/permissions passwords need to be unlocked before they can be merged.
PDFs can have two types of passwords. An open password (also called a user password) prevents anyone from opening the file without entering it. An owner password (also called a permissions password) doesn't lock the file but restricts what you can do — including merging, editing, or copying content. To merge a PDF that has an owner password, you first need to remove that restriction. Open-password PDFs need to be decrypted first by entering the known password.
Two types of PDF passwords:
Use the PDFree Protect/Unlock tool. Open pdfree.io/protect-pdf/, load your PDF, enter the owner password to unlock it, and download the unlocked version. Repeat for each locked PDF. Once unlocked, the files behave as normal PDFs and can be merged without any restriction.
After unlocking, drag all the unlocked PDFs into the merge tool above. Arrange them in the order you need and click "Merge PDF files". The result downloads directly to your device — no upload, no server, no account required.
Because all processing happens locally in your browser, your document contents are never transmitted to any server. This matters especially for sensitive documents protected by passwords.
If you don't have the password, you cannot unlock the PDF legally — the owner password exists specifically to prevent unauthorized modification. If you own the document and have lost the password, you may need to request a new copy from the original source or contact the document author.
Note on legality: Removing a PDF password restriction is legal only when you own the document or have the owner's permission. Never attempt to remove password restrictions from documents you are not authorized to modify.
Yes — this is an owner/permissions password. Open pdfree.io/protect-pdf/, enter the known password to unlock it, then merge the unlocked file.
You need to first enter the correct open password when loading the file. Once decrypted, the file can be merged normally.
Yes, if you are the owner of the document or have permission from the owner. Removing restrictions on files you don't own or have permission to modify may violate copyright law.
No. The output PDF from PDFree Merge has no password by default. If you want to protect the merged result with a password, use pdfree.io/protect-pdf/ after merging.
The PDF specification prevents tools from modifying locked documents without the password. This is a deliberate security feature — the same mechanism that prevents unauthorized editing also blocks merging.