Merge PDF
Drag-and-drop multiple PDFs, reorder, then merge into one. Processed right on your machine.
Merging happens on your machine — no file is uploaded to any server
Merging PDFs is the fastest way to combine multiple documents — contracts, invoices, forms, scans — into a single PDF that's easy to store and send.
With VietDocs, the entire merge runs right in your browser on your own device: pick your files, drag and drop to arrange the order, then download. Your files are never uploaded to a server, so even sensitive documents stay completely safe, with no usage limits and no software to install.
How to merge multiple PDF files into one
- 1Select PDF files
Drag and drop or click to select the PDF files you want to merge.
- 2Arrange the order
Drag the files to arrange them in the page order you want.
- 3Merge & download
Click Merge PDF, then download the result to your device.
Frequently asked questions
Does merging PDFs expose my documents?
Everything runs right in your browser — your files are never uploaded to any server, keeping them completely private.
Is there a limit on the number of files I can merge?
There's no fixed limit; it depends on your browser's memory and your device. A typical computer can merge dozens of files without any problem.
Is the tool free?
Yes, merging PDFs is completely free and requires no sign-up.