Can I merge password-protected PDFs?

Not directly. A PDF that is encrypted with an open password or owner restrictions shows up in the list with an error and is left out of the merge, while the other files still combine normally. Open the protected file in a viewer you trust, save or print an unprotected copy, and add that copy instead.

How do I control the page order?

Files are merged top to bottom in the order shown in the list. Use the up and down arrows to move a whole file. The pages inside each file keep their original order; this tool does not reorder or delete individual pages.

Is there a size or file limit?

You can combine up to 50 PDFs with a combined size of 100 MB per merge. Because the work happens in your browser's memory, very large scanned documents can be slow on phones or older laptops. If you hit the limit, merge in two batches and then merge the two results.

Does merging compress or reduce quality?

No. Pages are copied as they are, so text stays selectable and images keep their original resolution. That also means the merged file is roughly the sum of the inputs; it is not shrunk. Shared fonts or images across files are not de-duplicated.

What happens if the PDFs have different page sizes?

Each page keeps its own size and orientation. A Letter contract followed by an A4 appendix and a landscape spreadsheet will appear exactly that way in the merged file. Nothing is scaled or padded to a common size.

Merge PDF files into one document

A signed contract and its three exhibits. Scanned book chapters that came off the copier as separate files. A month of invoices that a client portal wants as a single upload. Put the PDFs in order here and get one file back.

Drop the PDFs you want to combine

or click to choose files - up to 50 PDFs, 100.00 MB total

Combining PDFs in three steps

1. Add the files

Drop PDFs onto the box above or pick them from a folder; you can select several at once and add more later. Each file is opened as soon as it is added, so you see its page count right away and know if something is wrong before you merge.

2. Arrange the order

The list reads top to bottom, which is the order the pages will appear. Move the cover letter to the top, push the appendix to the end, and remove anything that slipped in by mistake. The running total tells you how many pages the finished file will have.

3. Merge and check

Press the merge button. When it finishes you get the page count and file size of the result. If the order is off, go back and change it without re-adding anything. Download, or send the merged file straight to another tool.

What survives a merge, and what does not

This tool copies pages from each file into a new PDF. That keeps the pages themselves intact, but some things that live at the document level rather than on a page do not come along. Worth knowing before you send a merged file somewhere official.

Kept

Page content exactly as it was: text stays selectable and searchable, images keep their resolution.
Each page's size, orientation and rotation.
Visible annotations such as highlights and comments, and links to websites in most files.

Lost or changed

Bookmarks (the outline panel). The merged file has no table of contents, even if the originals did.
Fillable form fields. Their current appearance is copied, but they usually stop being editable. Fill and flatten forms before merging.
Links that jump to another page inside the same document may no longer go anywhere.
Document properties such as title and author, plus custom page labels like i, ii, iii.

Not supported

Encrypted or password-protected PDFs. They are flagged in the list and skipped rather than producing blank pages.
Digital signatures. A merged file is a new document, so any signature on an original no longer validates.

Your files stay on your device

Contracts, medical records and tax documents are exactly the kind of PDFs people merge, so this tool does not upload them. The merging code runs in your browser tab, the files are read from your disk and the result is written back to it. Closing the tab clears everything. You can confirm it in your browser's developer tools: the Network tab shows no request carrying your files.

Questions about merging PDFs

Can I merge password-protected PDFs?: Not directly. A PDF that is encrypted with an open password or owner restrictions shows up in the list with an error and is left out of the merge, while the other files still combine normally. Open the protected file in a viewer you trust, save or print an unprotected copy, and add that copy instead.
How do I control the page order?: Files are merged top to bottom in the order shown in the list. Use the up and down arrows to move a whole file. The pages inside each file keep their original order; this tool does not reorder or delete individual pages.
Is there a size or file limit?: You can combine up to 50 PDFs with a combined size of 100 MB per merge. Because the work happens in your browser's memory, very large scanned documents can be slow on phones or older laptops. If you hit the limit, merge in two batches and then merge the two results.
Does merging compress or reduce quality?: No. Pages are copied as they are, so text stays selectable and images keep their original resolution. That also means the merged file is roughly the sum of the inputs; it is not shrunk. Shared fonts or images across files are not de-duplicated.
What happens if the PDFs have different page sizes?: Each page keeps its own size and orientation. A Letter contract followed by an A4 appendix and a landscape spreadsheet will appear exactly that way in the merged file. Nothing is scaled or padded to a common size.