Merge PDF files online

How to Merge PDF files

1

Add your PDFs

Click “Select files” or drag and drop two or more PDFs. You can add up to 50 files at once.

2

Reorder pages

All pages from all files appear as thumbnails. Drag any page to move it. Cross-file reordering works the same as within a single file. Rotate pages with the rotate icon if needed.

3

Merge and download

Click “Merge”. The combined file saves to your Downloads. Original files are never modified.

Every step runs in your browser. No server uploads, no waiting.

Why use this tool

DukPdf’s Merge PDF tool combines two or more PDF files into a single document in your browser. Drag to reorder pages across files, rotate individual pages, and download the combined result. All merging runs locally — your files never leave your device. If you need to split a merged file back into separate files, use Split PDF. To remove specific pages from a file before merging, use Remove Pages. For a deeper guide with step-by-step instructions, see our merge PDF guide.

When you'd use this

Combine invoice batches

Merge multiple invoice PDFs into a single document for your accountant or expense report.

Assemble legal exhibits

Combine motions, exhibits, and supporting documents into a court-ready packet. Privileged materials stay on your device.

Bundle patient records

Merge lab reports, imaging, and intake forms for a single visit. PHI never leaves the local device.

Compile a research packet

Stitch chapters, appendices, and references into a single submission-ready document.

Why this matters for your privacy

☁️ CLOUD PDF TOOLS
📄 your-file.pdf
↓ uploaded over the internet
☁️ their server

A copy of your document sits on someone else’s infrastructure — deleted on their schedule, not yours.

✗ OUT OF YOUR HANDS
DukPdf
📄 your-file.pdf
⟳ stays right where it is
💻 your device

Processed by your own browser, start to finish — on your machine, under your control.

✓ STAYS ON YOUR DEVICE

We send the software to your file — not your file to our servers.

Merge PDF — questions

Is Merge PDF really free?

Yes. Completely free, with no account required, no email, and no watermark on the output. DukPdf Pro lifts file size and batch limits for heavy users.

How many PDFs can I merge at once?

Up to 50 PDFs in a single merge. For very large batches, DukPdf Pro lifts the limit further.

Will merging reduce quality?

No. The merge only rearranges pages and copies streams — it does not re-render or recompress. Output pages are byte-identical to the input.

Are my PDFs uploaded to a server?

No. The merge runs entirely in your browser using qpdf compiled to WebAssembly. Open DevTools → Network tab while merging — zero upload requests.

Can I rearrange pages from different files?

Yes. All pages from all uploaded files appear in a single thumbnail grid. Drag any page to reorder it across the entire merged document.

Will bookmarks and metadata be preserved?

Bookmarks from the first file are preserved. Document metadata (title, author) from other files is not carried over — use Edit Metadata on the result if you need a specific title.

Tools that pair with merge pdf

→ Split PDFSplit the merged file back into separate files→ Remove PagesDelete pages before merging→ Extract PagesSave specific pages from the merged result→ Compress PDFShrink the merged file for email→ Protect PDFPassword-lock the merged document→ Add WatermarkStamp a label on the merged file
🔒 DukPdf — YOUR FILES NEVER LEAVE YOUR DEVICE

Ready to merge pdf files? Your files stay yours.

No server uploads. No watermark. Just open a tool, drop your files, and download the result. Your original files are never modified.

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