How to Merge Two PDF Files
To merge two PDFs, upload both files, place the first document above the second, and export one combined PDF. The final file follows the order shown in the list.
Quick answer
How to do it
- 1Upload the first PDF.
- 2Upload the second PDF.
- 3Move the files until the order is correct.
- 4Click Merge PDF.
- 5Download the combined file.
The simplest merge case
Merging two PDFs is common when you have a main document and one attachment: a contract and signature page, an invoice and receipt, a form and ID scan, or a report and appendix.
The first PDF in the list becomes the first part of the final document. The second PDF follows it.
The file order controls the final PDF
The most important part of merging PDFs is sequence. The first file becomes the first section of the final PDF, the second file follows it, and so on.
Before you click Merge PDF, check the preview list and move files up or down until the cover page, main document, appendices and attachments are in the right order.
Before merging two files
Open each PDF if you are unsure what it contains. If either file includes pages that do not belong, clean it first with Delete Pages or Extract Pages.
If the final file is too large, merge first and then use Compress PDF on the combined document.
Privacy and browser processing
LiftPDF merges PDFs in your browser for supported files. The pages are copied locally into a new document, so the workflow does not require a document upload API.
That matters for contracts, invoices, reports and personal records. You still need to use good judgment with sensitive files, but avoiding a server upload is a practical privacy advantage.
FAQ
Questions about merging PDFs
Can I merge PDF files for free?
Yes. LiftPDF lets you merge PDF files for free in your browser.
Are my PDFs uploaded to a server?
For supported files, the merge runs locally in your browser. LiftPDF does not need a backend upload API to combine the pages.
Will PDF quality change after merging?
No. LiftPDF copies the original PDF pages into a new document instead of converting them into images.
Can I change the order before merging?
Yes. Reorder the PDF files in the list before exporting. The final PDF follows that order.
Can I put the second PDF first?
Yes. Move the second file above the first before merging. The exported PDF follows the order you choose.
Will both PDFs stay unchanged?
The original files remain unchanged. LiftPDF creates a new PDF from copies of their pages.