Merge PDFs
Merge multiple PDFs into one. Reorder with drag & drop. No sign-up, 100% in browser.
Drag PDFs here or click to select them
PDF files only
Upload two or more PDFs and order them. The resulting PDF will keep the order you choose.
Built by
Miguel Ángel Colorado Marin
Built by
Miguel Ángel Colorado Marin
Full-Stack Developer · Guadalajara, España
I develop web apps, digital tools and full projects — from design to deployment.
How to merge PDFs?
- 1
Upload PDFs
Drag your PDF files to the upload area or click to select them from your device. You can add as many PDFs as you need. Only PDF format files are accepted.
- 2
Reorder documents
Once loaded, drag each file to change the order in which they will appear in the final PDF. The number on the right indicates the current position of each document. You can also use the up/down arrows.
- 3
Merge and download
Click Merge & download. The tool combines all PDFs in the order you have chosen and automatically downloads the merged file. All processing happens in your browser without sending anything to any server.
Frequently asked questions
How many PDFs can I merge at once?
There is no limit imposed by the tool. You can merge as many PDFs as you need. The only real limit is your device's RAM, since all processing happens entirely in the browser without sending anything to any external server.
Is the quality of the original PDF maintained?
Yes, completely. The tool copies pages from each PDF to the final document without recompressing any content. Images, fonts and visual formatting remain exactly the same as in the original files.
Does it work with password-protected PDFs?
No. Password-protected PDFs cannot be opened without the access key, so they cannot be merged either. You need to unprotect or unlock the PDF before trying to merge it with this tool.
Does the order of the PDFs matter?
Yes, the order in which the files appear in the list is exactly the order in which they will be merged. The first in the list will be the first block of pages of the final PDF. You can freely reorder them by dragging before clicking merge.
Are my PDFs sent to any server?
No, not at all. All processing happens exclusively in your browser using the open source pdf-lib library. No PDF file leaves your device at any point. It is completely private and safe for confidential documents.
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Embed the merger on your site
Embed this PDF merger tool in any web page with a simple iframe:
<iframe
src="https://miguelacm.es/embed/pdf-merge"
width="100%"
height="600"
frameborder="0"
title="PDF Merge"
></iframe>