How to Merge PDF Files
Combine multiple PDFs into a single file in seconds — free, private, and no upload required.
What does merging a PDF mean?
Merging (or combining) PDFs means taking two or more separate PDF files and joining them into one continuous document. You might need this when assembling a report from separate chapters, combining scanned pages, or attaching appendices to a contract.
Why use a browser-based tool?
Most online PDF mergers upload your files to a server to process them. That creates a privacy risk — especially for legal documents, financial records, or medical files. PrivaPDF's merge tool runs entirely inside your browser using WebAssembly. Your files never leave your device.
Step-by-step: merge PDFs with PrivaPDF
Go to PrivaPDF's Merge PDF tool. No account or sign-in needed.
Click Add files or drag and drop your PDFs directly onto the tool. You can add as many files as you need.
The files appear as a list. Drag them up or down to set the exact order you want in the final merged PDF.
Hit Merge PDFs. The merged file is generated in your browser and downloaded automatically — no waiting for a server.
Tips for better results
- Consistent page sizes: If your PDFs have different page sizes (A4 vs Letter), the merged file will preserve each page's original size. This is usually fine but worth knowing.
- Password-protected PDFs: Unlock the PDF first using the Unlock tool, then merge.
- Large files: Because everything runs in your browser, very large PDFs (over 100 MB each) may take a few seconds on older devices.
- Page order: Always double-check the order in the list before hitting Merge — it's easier than re-merging.
Frequently asked questions
Is there a limit on how many PDFs I can merge?
Free users can merge up to 5 files per session. Pro users get unlimited merges with no file count limit.
Does the merged PDF preserve bookmarks and hyperlinks?
Internal bookmarks are preserved. Hyperlinks within the document content are kept. Complex interactive forms may lose interactivity after merging.
Can I merge a PDF with a Word document?
Not directly — you'd need to convert the Word file to PDF first using the Word to PDF converter, then merge the resulting PDFs.