Opening tool…
Runs in your browser. Nothing you enter is uploaded to ALCO.
About this tool.
Combine PDF documents into a single file. Add them, drag the list into the order you want, and download the result. It handles up to 20 documents totaling 10 MB and 100 pages in one pass, keeps every page exactly as it was, and tells you plainly when a file is password protected or damaged rather than producing a broken document.
Using this tool.
Where are my documents processed?
In this page, by your own browser. Nothing is uploaded — you can watch the network tab while you merge and see that it stays empty.
Why are there size and page limits?
Because the work happens in a browser tab, which has to hold every input document and the finished one in memory at the same time. The limits are 20 documents, 10 MB combined and 100 pages. Past that a desktop PDF application is the right tool.
What happens to password-protected PDFs?
They are refused with an explanation rather than merged. Unlocking a document its owner protected is not something this tool will do quietly; open it in a PDF reader, save an unlocked copy, and merge that.
Does merging change the pages?
No. Pages are copied across intact, at their original size and rotation. Form fields, bookmarks and attachments that belong to the original documents are not carried over.
More PDF tools.
Split a PDF
Save chosen pages from a PDF as a new document, or one file per page.
Open Split a PDFRotate PDF pages
Turn sideways or upside-down pages the right way up and save the result.
Open Rotate PDF pagesImages to PDF
Turn photos or scans into one PDF, one image per page, in your order.
Open Images to PDF