Merge PDF Files
Combine PDFs in any order — in seconds, on your device
To merge PDF files, drop two or more PDFs below, put them in the order you want using the arrows, and click Merge. Fylo combines them into a single PDF in your browser in seconds, keeping text, links and quality intact. There's no upload, no signup and no watermark.
Drop PDFs here
or tap to browse · paste with Ctrl+V · add many at once
Your files never leave your device
How to merge PDF
Add your PDFs
Drop two or more PDF files into the box or tap to choose them.
Set the order
Use the up and down arrows to arrange the files. The merged PDF follows the list from top to bottom.
Merge and download
Click Merge PDFs and download the combined document.
How merging works
Fylo uses the open-source pdf-lib library to copy every page from each file, in the order you set, into a new document. Pages are copied as-is — text stays selectable, vector graphics stay sharp and images aren't re-compressed — so the merged PDF has the same quality as your originals. Page sizes and orientations are kept, so you can mix A4 letters with landscape spreadsheets.
Good to know before merging
Bookmarks (the outline panel) and interactive form fields from the source files aren't carried over; if you need filled-in forms, fill and flatten them before merging. Password-protected PDFs must be unlocked first.
Because merging happens on your device, combining confidential contracts, medical records or bank statements doesn't expose them to any server — and there's no upload wait, even for large files.
| Feature | Fylo | Typical upload-based tool |
|---|---|---|
| Files sent to a server | No — merged on your device | Yes |
| File size limit | Your device's memory | Often capped on free plans |
| Number of files | No fixed limit | Often capped on free plans |
| Watermark | None | Sometimes |
| Signup | Not required | Often required for batches |
Frequently asked questions
How do I change the order of the PDFs?
Use the up and down arrows next to each file. The merged PDF follows the list from top to bottom.
Can I merge only certain pages?
Split the PDF first to extract the pages you need, then merge the results.
Is there a limit on the number of files?
No. You can merge as many PDFs as your device's memory allows — typically hundreds of pages on a modern phone or laptop.
Can I merge PDFs on iPhone or Android?
Yes. Tap the box to pick PDFs from Files or your downloads, then merge and save.
Are my files uploaded to a server?
No. Merge PDF runs entirely in your browser — your files are processed on your own device and never sent anywhere. Once the page has loaded, it even keeps working if your connection drops.
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