Writing a page range
Leave the range box empty and the whole file is included. To take a subset, the syntax is the same one printers and word processors use:
1-5— pages one through five.2,4,7— those three pages only, in that order.1-3,8-10— two blocks combined.5-— page five to the end.3,1,2— pages reordered as written, which is a quick way to fix a document assembled out of sequence.
Page numbers refer to the physical position in the PDF, not to any number printed on the page. A document whose first two pages are an unnumbered cover and contents page will have its "page 1" at physical page three.
What merging preserves and what it drops
Pages are copied with their content intact — text stays selectable, embedded fonts come along, images keep their original resolution, and nothing is re-compressed. Page size is preserved per page, so mixing A4 and Letter documents produces a file with both sizes rather than forcing one to scale.
Some things do not survive. Form fields, annotations, digital signatures and embedded JavaScript are dropped or invalidated, because the merged file is a new document. If you are combining signed contracts, keep the signed originals — the merged copy is a convenience copy, not a legally equivalent one.
Why the file size is roughly the sum of its parts
Merging does not compress. The output is close to the total of the inputs, minus a little shared structure. If the result is too large to email, compress the individual PDFs before merging rather than looking for a setting here — most of the weight in a large PDF is scanned images, and that is where the saving is.
Encrypted and password-protected files
A PDF protected with an open password cannot be read without it, so it cannot be merged here. Remove the protection in the application you own the file with first. Files with an owner password that restricts printing or editing but opens freely will usually merge without issue.
Frequently asked questions
Are my PDFs uploaded anywhere?
No. The merge happens in your browser and the result is saved straight to your device. This matters for contracts, invoices and identity documents — none of it is transmitted.
How many files can I merge?
There is no fixed limit. Memory is the constraint: several hundred megabytes of input may be slow or fail on a phone, while a desktop handles it comfortably.
Will the merged file keep its bookmarks?
Bookmarks inside the original files are not carried over. The option above instead adds one bookmark per source file, so you can jump between sections in the merged document.
Can I merge a PDF with a Word document?
Not directly. Export the Word document to PDF first, then merge — most word processors have this built in.