Are my PDF files uploaded to a server?

No. The selected PDF files are processed in your current browser and are not uploaded to or stored on PDFCook servers.

Can I change the order before merging PDFs?

Yes. Drag each PDF first-page thumbnail card to a new position, or use the left and right move buttons before merging.

How many PDFs can I merge at once?

You can currently select up to 20 files, up to 50MB per file and 200MB in total. The practical limit also depends on the memory available on your device.

Can I merge password-protected PDFs?

Encrypted or editing-restricted PDFs may not be processed. Certificate-based digital signatures may also become invalid when pages are copied into a new PDF.

Merge PDF Online

Combine multiple PDF files into one and reorder them before merging.

Drop the PDF files you want to merge
hereChoose PDF FilesMultiple files supported · up to 50MB per file

The selected PDFs are not uploaded to PDFCook servers.

How to combine multiple PDF files into one

1. Add PDFsSelect multiple PDF files or drop them into the upload area.

2. Arrange the orderDrag the first-page thumbnail cards or use the left and right buttons to set the final order.

3. Merge and downloadCombine the PDFs in the current order and download the new file.

Merge multiple PDFs and reorder files before combining

PDFCook Merge PDF combines separate contracts, scanned documents, reports or attachments into one PDF. You can use it directly in a web browser without installing a desktop PDF app or creating an account.

Each PDF appears as a first-page thumbnail card, so you can visually check the documents while arranging their order. Remove files you do not need, add more PDFs, and review the total file and page counts before merging.

The selected PDF contents stay on your device. PDFCook processes them in your current browser instead of uploading the documents to a conversion server.

Need to place a seal or signature after merging? Use Add Stamp / Signature to PDF. To convert a Korean HWP or HWPX document first, use HWP to PDF.

Frequently Asked Questions

Can I merge PDFs without uploading them to a server?

No. The PDF files are read and merged in your current browser and are not uploaded to or stored on PDFCook servers.

Can I reorder PDF files before merging them?

Drag a PDF first-page thumbnail card to the position you want. On mobile or with keyboard navigation, use the left and right buttons under each card to move it earlier or later.

Can I merge only selected pages from each PDF?

This merge tool currently combines every page from each selected PDF. Use Split PDF to extract selected pages and Organize PDF to delete or reorder pages.

Will digital signatures remain valid after merging?

Certificate-based digital signatures verify document integrity, so copying pages into a new PDF can invalidate existing signatures. Keep the signed originals when signature verification matters.

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