Merge PDF
Combine multiple PDFs into a single document in your desired order.
Click to upload or drag & drop
Add as many files as you need. They will remain locally on your device.
Configuration
Combine PDFs in your browser — nothing is uploaded
Foldr merges PDF files by loading them straight into your browser's memory and stitching the pages together with the open-source pdf-lib library. There is no upload step, because there is no server involved — the merge happens locally, on your device.
This matters if the documents you're combining are contracts, medical records, financial statements, or anything else you'd rather not hand to a third-party server. You can drag files in, reorder them, and export a single combined PDF without an internet connection after the page has loaded.
How it works
- 1
Drop two or more PDF files into the upload area, or click to browse.
- 2
Drag the file rows to set the order pages should appear in the final document.
- 3
Click "Run Merge PDF" — the combined file downloads straight to your device.
This tool never uploads your file. All processing happens locally in your browser using WebAssembly. Read more about how Foldr handles your data.
Frequently asked questions
Are my files uploaded to a server when I merge PDFs?
No. Merging happens entirely inside your browser tab using WebAssembly. Your files are read into local memory, combined, and offered as a download — none of it is transmitted anywhere.
Is there a limit to how many PDFs I can merge?
There's no artificial cap. In practice, the limit is your device's available memory, since every page is processed locally rather than on a remote server.
Can I merge PDFs without an internet connection?
Yes, once the page has loaded once, the merge tool keeps working offline since all the processing logic runs client-side.