How to Merge PDF Files for Free
Merging PDF files — combining several documents into one — is one of the most common PDF tasks: stitching together scanned pages, assembling a report from separate sections, or combining invoices for accounting. Here's how to do it in under a minute, without installing anything or sending your files anywhere.
1. Open the Merge PDF tool
Go to the Merge PDF page. You don't need an account, and nothing is asked of you before you can start.
2. Add your PDF files
Drag and drop your files onto the page, or click "Browse files" to pick them from your device. You can add as many PDFs as you need.
3. Put them in the right order
Use the up and down arrows next to each file to arrange them in the order you want them to appear in the final document.
4. Merge and download
Click "Merge PDF". The combined file is built directly in your browser in a few seconds, then you can download it.
Because the merge happens locally in your browser, your files are never uploaded anywhere — which matters if you're combining anything sensitive, like contracts, ID documents, or financial statements.
Try the toolFrequently asked questions
Is it safe to merge PDF files online?
With SwissPDF specifically, yes: the merge happens entirely on your device using your browser's built-in capabilities. Your files are never sent to a server, so there's no upload, no third party seeing the content, and nothing stored anywhere once you close the tab.
Is there a limit to how many PDFs I can merge?
There's no limit on the number of files. The only constraints are the 100 MB size limit per file, and your device's available memory for very large merges.
Can I reorder pages, not just files?
The Merge tool combines whole files in the order you choose. If you need to reorder or remove individual pages, use the Rotate & Reorder or Split tools after merging.
Does merging reduce PDF quality?
No — merging just combines the existing pages as they are, without re-encoding or compressing anything, so quality is unchanged.