All tools
Organize PDF

Merge PDF

Combine PDFs in the order you want: drag to rearrange, then merge into a single document. Everything happens in your browser, so your files stay private.

Drop PDFs to merge
Add two or more files. Reorder them next
No upload · processed locally · auto-deleted
A · Keep going

Related tools

Split PDFCompress PDF
Organize pages
PDF to Word
B · How it works

How to merge PDF files without uploading them

Merging PDFs with FernPDF takes three steps: drop your files into the workspace, drag the cards into the order you want, and click Merge PDF. The combined document downloads instantly.

Unlike most online merge tools, FernPDF never transmits your documents. The entire operation runs in your browser using WebAssembly, so confidential contracts, financials, and personal records stay on your machine.

That makes it safe for legal, finance, and healthcare workflows where uploading files to a third-party server isn’t an option. It’s also faster, because there’s no upload to wait for.

C · FAQ

Yes. FernPDF stitches your PDFs together locally using WebAssembly. The combined file is assembled in memory on your device and never sent anywhere.

Drag any file card to reorder it. The number badge shows the final sequence. You can also remove a file with the × button without re-uploading the rest.

Yes. Enable “Add page numbers” to stamp a continuous count across the merged file, and “Flatten form fields” to lock filled forms as static page content. Both run locally.

As many as your device memory allows. Most machines handle dozens of large PDFs at once, and there’s no per-file upload, so big batches stay fast.