Merge PDF files online for free
Add your PDFs, choose their order and download one document. Merging happens in your browser: no file is uploaded.
One document, in the right order
Add at least two PDFs, then choose their order.
Drop your PDFs here
Or choose them from your device. No file is uploaded.
PDF only · up to 20 files · 100 MB total (40 MB on mobile)Merge order
Drag cards or use the arrow buttons to change the order.
100% local processing, nothing is uploaded
How does it work?
Drop or choose your PDF files. A first-page thumbnail and page count help you check each document. Arrange the files in their final order, then start merging.
The result contains every page from each PDF in that order. Processing happens locally in your browser, in a separate worker so the interface stays responsive.
Examples
One complete application
Combine a 2-page résumé and a 1-page cover letter into one 3-page PDF, in the order you choose.
Supporting documents in one file
Add 4 documents, move the newest to the top, and download a single PDF. Pages within each document keep their order.
Frequently asked questions
How can I merge PDFs for free?
Add at least two PDFs, arrange them, then select “Merge PDFs”. Your new document downloads directly to your device.
Are my files uploaded?
No. Reading, previews and merging all happen in your browser. Your documents are never sent to Kortex.
Can I rearrange the files?
Yes. Drag files in the list or use the Move up and Move down buttons, which also work with a keyboard.
Can I use password-protected PDFs?
No. First unlock the document with its password in your PDF reader, then add an unprotected copy.
What is the size limit?
You can combine up to 20 documents, totaling 100 MB and 500 pages. On mobile, the size limit is 40 MB to protect device memory.