Merge PDF
Combine multiple PDF files into one
Combines multiple PDF files into a single PDF, with a reorder step so you can control the exact page order before merging.
How it works
After you add your PDFs, they appear in a reorderable list — move any file up or down, or remove one you don't need, before merging. The merge itself copies every page from each file in that exact list order into one new PDF.
Frequently asked questions
Can I change the order the files get merged in?
Yes — use the up/down arrows next to each file in the list before clicking Merge. The final PDF's page order follows that list exactly.
Does it preserve the page order within each individual PDF?
Yes — pages within each source file keep their original internal order; reordering the list only changes which whole file comes before which.
What's the size limit?
100MB per PDF file, with no cap on how many files you merge.
Are my PDFs uploaded anywhere?
No — the merge happens entirely in your browser using the pdf-lib library. Nothing is sent to a server.
Can I remove a file after adding it, before merging?
Yes — each file in the reorder list has its own remove button, so you can drop one without starting over.