Merge PDF
Combine multiple PDF files into one. Drag items to change their order.
Drop your PDF files here
Select multiple PDFs to combine
Browse FilesHow PDF Merging Works
Merging PDFs combines multiple separate PDF documents into a single file. This tool processes each PDF in your browser using pdf-lib, joins the pages in your chosen order, and produces a new downloadable PDF without uploading anything.
Benefits: No file size limits, drag to reorder pages, no uploads, instant processing, preserves original quality.
Best for: Combining scanned documents, joining reports, merging presentation slides, assembling contract packages.
Limitations and tradeoffs
- PDFs merge in the order you arrange them in the list.
- Encrypted or permission-locked PDFs may fail to merge.
- Extremely large combined documents can take longer on low-power devices.
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Next step
Need a different route? Check the next tool in this cluster instead of starting over.
Browse PDF toolsQuestions before you use it
Is there a limit on how many PDFs I can merge?
No artificial limit. The only constraint is your device RAM. Most modern devices can merge dozens of PDFs comfortably.
Will the quality of my PDFs be affected?
No. The merge is purely structural. Pages are copied exactly as they are. Text, images, and formatting are preserved.
Are my PDF files uploaded to a server?
Never. All merging happens locally in your browser using JavaScript. Your files never leave your device.