How to Merge PDF Files into One

When You Need to Merge PDFs

Here are the most common situations where PDF merging is the right solution:

• Combining scanned documents — you scanned a form in batches and ended up with 3 files instead of 1
• Assembling a report — cover page, content pages, and appendices are in separate files
• Collecting signed pages — multiple people signed different pages of a contract and returned them separately
• Payslip archives — gathering 12 monthly payslips into one annual file
• Portfolio compilation — combining work samples, certificates, or references into one submission file

How to Merge PDFs Using Rifix

1. Go to rifixpdf.xyz/merge
2. Click Add Files — select all the PDFs you want to combine (you can select multiple files at once using Ctrl+Click or Cmd+Click)
3. The files appear as a list with page thumbnails
4. Drag to reorder — drag any file up or down in the list to set the page order
5. Click Merge PDFs
6. Download the combined file

There's no limit on the number of files you can merge. All processing happens in your browser — no files are uploaded to any server.

Merging Specific Pages Only

If you only need certain pages from each file — for example, page 3 from one document and pages 1–2 from another — use Split first:

1. Go to rifixpdf.xyz/split
2. Open the first PDF and extract the pages you need (download as a new PDF)
3. Repeat for each source file
4. Then merge the extracted files in the correct order

This two-step approach lets you build a precisely structured combined document from any pages across any number of source files.

Common Issues When Merging PDFs

Different page sizes

If your PDFs have different page sizes (for example, A4 and Letter), the merged document will preserve each page at its original size. Most PDF viewers handle mixed-size documents correctly. If you need uniform page sizes, use the Crop tool to standardise before merging.

File size after merging

The merged file is approximately the sum of the individual files. If the result is too large to email, run it through Rifix Compress after merging.

Password-protected PDFs

Password-protected files need to be unlocked before merging. Use Rifix Unlock PDF to remove the password first, then add the unlocked version to the merge.

How Many Files Can You Merge?

There's no hard limit in Rifix — you can merge 2 files or 200 files. The practical limit is your browser's available memory. Very large merges (50+ files, each 10 MB) may slow down on older devices. If you hit performance issues, merge in batches of 20–30 files and then merge the resulting files together.

After Merging — Sign or Add Page Numbers

Once you have your combined document, you may want to:

• Add page numbers — use Add Page Numbers to number the combined document from 1 across all pages
• Sign the combined document — use PDF Signer to add your signature to the final merged file
• Add a watermark — use Watermark PDF to mark the document as Draft, Confidential, or with your name