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Merge PDF files — combine several PDFs into one
How to merge
Drag and drop your PDFs or add them with "Choose file", arrange the order with the arrows and press Merge. The result is ready to download immediately; since nothing is uploaded, speed depends only on your device.
Typical uses
Combining scanned contract pages, collecting invoices into a monthly file, joining thesis chapters, sending application documents as a single PDF.
Privacy
Files are processed in browser memory and discarded when the page closes, which makes the tool safe for contracts, ID documents and medical records.
Frequently asked questions
Are my files uploaded to a server?
No. Merging is done entirely in your browser with the pdf-lib library. Nothing is sent over the network; it even works offline once the page is open.
How do I change the order?
Use the arrow buttons in the list to move files up or down; the merged PDF follows that order.
Is there a size limit?
Only your device's memory; a few hundred MB in total works fine. Encrypted PDFs cannot be opened.
Are bookmarks and forms kept?
Pages and their content are kept; bookmarks and interactive form fields are not carried into the merged file.