How to Use
- 1
Upload two or more PDF files by clicking the upload area or dragging them in.
- 2
Reorder the files by dragging them into your preferred sequence - the merged PDF will follow this order.
- 3
Click Merge & Download to combine all PDFs into a single file and save it to your device.
Frequently Asked Questions
How many PDFs can I merge at once? ▼
There is no hard limit on the number of files. However, very large PDFs may require more memory and time to process. For best performance, keep total combined size under 100MB.
Is my PDF uploaded to a server? ▼
No. Merging runs entirely in your browser using pdf-lib, a pure JavaScript PDF library. Your files never leave your device.
Can I reorder pages before merging? ▼
Yes. Drag the file thumbnails to set the order before merging. Each file's pages are inserted in sequence.
Will the PDF quality be affected? ▼
No. pdf-lib merges PDFs at the binary level, preserving the original quality, formatting, fonts, and embedded content of each source file.