How do I merge PDF files online for free?

Upload two or more PDF files using the drop zone above, arrange them in the order you want, then click Merge & Download PDF. The merged file downloads instantly to your device.

Is my PDF data safe when using this tool?

Yes. All processing happens entirely inside your browser using the pdf-lib JavaScript library. Your files are never uploaded to any server, so your data remains completely private.

Is there a file size limit for merging PDFs?

There is no hard limit set by this tool. Practical limits depend on your device's available RAM. For very large PDFs (over 100 MB each), performance depends on your browser and hardware.

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📎 PDF Merger

Combine multiple PDF files into one. Drag, reorder, and download instantly — no upload, no server.

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Add PDF Files

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Drop PDF files here

or tap / click to browse — you can add multiple files

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Files to Merge

No PDF files added yet. Drop files above or tap / click to browse.

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About This Tool

This tool uses pdf-lib, a pure JavaScript PDF library, to merge your files entirely inside your browser. No files are ever sent to any server — your PDFs stay on your device. You can add as many files as you like, drag to reorder them, and download the merged result instantly.

📎 Combine unlimited PDFs

↕ Reorder before merging

✓ Zero server transmission

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Frequently Asked Questions

Are my PDFs uploaded to a server?

No. PDF merging uses pdf-lib which runs entirely in your browser. Your documents are never transmitted to any server and remain completely private on your device.

Can I merge encrypted PDFs?

Yes. Encryption is handled during the merge process. If a PDF has owner-level restrictions, those are ignored so pages can be merged freely into a new document.

How many PDFs can I merge?

There is no hard limit on the number of PDFs you can merge. You can combine as many documents as you need, limited only by your available browser memory.

Will the merged PDF preserve bookmarks and hyperlinks?

Hyperlinks within pages are preserved in the merged PDF. Document-level bookmarks (outlines) from individual PDFs may not be carried over to the merged document, as each PDF has its own bookmark structure.

Can I reorder pages before merging?

Yes. Drag and drop the uploaded PDF files to reorder them before merging. The pages will appear in the merged PDF in the order shown in the file list.

What is the difference between merging and combining PDFs?

They mean the same thing — combining multiple PDF files into a single PDF document. The result is one file containing all pages from all input PDFs, in the order you specify.