Merge PDF
Combine multiple PDFs into one. Processed in your browser — files are never uploaded.
No upload, no data sent — everything runs in your browser.
About this tool
The PDF merge tool combines several PDFs into one in the order you choose. It runs in your browser and never uploads your PDFs. Knowing what merging does and does not do keeps the result matching your expectation.
It "joins" without changing content
Each page keeps its content and layout, and the files are simply concatenated in order. A mix of A4 and landscape slides keeps each page as-is. To make the whole thing uniform, standardize orientation and size in each file before merging.
Decide the order before merging
The order you set becomes the page order. Arrange them as intended — a quote followed by a contract, chapters in sequence — before you merge.
File size is roughly the "sum"
The merged size is close to the sum of the source PDFs. Merging an extremely large number of files or very large documents at once may be slow depending on your device.
Remove passwords first
Encrypted PDFs may not load. Remove the password protection from any protected files before merging.
How to use
- Select multiple PDFs to combine (drag & drop works too).
- Reorder with ↑↓.
- Press Merge and download the resulting PDF.
FAQ
Are my PDFs uploaded to a server?
No. Merging happens entirely in your browser and the PDFs you select are never sent externally. Even contracts or documents with personal data stay on your device, so you can use it with confidence.
Can I set the order of the files?
Yes. You can adjust the order of the selected files before merging, so they combine into a single PDF in exactly the sequence you intend.
Is there a limit on the number of files?
Processing happens within your device memory. Merging an extremely large number of files or very large documents at once may be slow depending on your device.
Does it change page content or layout?
No. Each page keeps its content and layout intact — the files are simply joined in order.
Can I mix PDFs of different sizes and orientations?
Yes. Each page keeps its original size and orientation. If you want a uniform result, standardize them in each file before merging.
Can I merge password-protected PDFs?
Encrypted PDFs may not load. Remove the password protection from any protected files before trying to merge them.