How to merge PDF files into one document

Last updated: 21 October 2026

Sending one PDF is easier than sending five. Merging puts all pages into a single file in the order you choose, which is handy for application packs, invoices for a month, scanned receipts or a report with separate appendices.

Step by step

1. Open the Merge PDF tool on compare2pdf.com.
2. Click Select PDF files, or drop the files onto the page. You can add more files at any time.
3. Drag the files in the list to put them in the right order.
4. Click Merge PDF. The merged file downloads as merged.pdf.

Tips

• Name your files with numbers such as 01, 02, 03 before you start. They are easier to recognise in the list.
• If one file has pages in the wrong orientation, merge first and then fix them with Rotate PDF or Organize PDF.
• Password-protected PDFs must be unlocked in the program that created them before they can be merged.

Is it safe for confidential files?

Yes. The files are joined inside your browser on your own device. Nothing is uploaded, so contracts, IDs and financial documents never leave your computer or phone.