Processed on your device — never uploaded
Merge PDF files
Combine PDFs in the order you want
Drop files here, or browse
.pdf — processed on your device, never uploaded
How it works
- 1
Drop two or more PDF files into the zone below.
- 2
Drag cards to set the exact page order, then pick your options.
- 3
Click Merge — your combined PDF downloads instantly, nothing ever left your device.
Why FoldPDF
- Files processed 100% locally — verifiable in DevTools
- No file size or daily usage limits
- No watermarks, no accounts, no paywalls
- Works offline once loaded
Frequently asked questions
Is this merge pdf tool really free?+
Yes — every FoldPDF tool is free with no file limits, watermarks, or sign-up. Processing runs on your own device, so it costs us nothing to serve.
Are my files uploaded to a server?+
No. Files are processed entirely inside your browser using WebAssembly. You can verify with your browser's developer tools that no file data is transmitted.
How does merge pdf work?+
Combine multiple PDF files into a single document, in exactly the order you choose. Drag to reorder before merging.