Is there a limit on how many PDFs I can merge?

No artificial limit. The only constraint is your device RAM. Most modern devices can merge dozens of PDFs comfortably.

Will the quality of my PDFs be affected?

No. The merge is purely structural. Pages are copied exactly as they are. Text, images, and formatting are preserved.

Are my PDF files uploaded to a server?

Never. All merging happens locally in your browser using JavaScript. Your files never leave your device.

Can I change the page order before merging?

Yes. After uploading your PDFs, drag the file entries in the list to rearrange them. The merged output follows the exact order you set, so you have full control over the final page sequence without needing to rename or re-upload files.

What happens if one of my PDFs is password-protected?

Password-protected or permission-locked PDFs may fail during the merge step because the browser cannot read their internal page structure. Remove the password from the file first using your PDF viewer, then add it back to the merge list.

Merge PDF

Combine multiple PDF files into one. Drag items to change their order.

Drop your PDF files here

Select multiple PDFs to combine

WHY THIS TOOL EXISTS

How PDF Merging Works

Merging PDFs combines multiple separate PDF documents into a single file. This tool processes each PDF in your browser using pdf-lib, joins the pages in your chosen order, and produces a new downloadable PDF without uploading anything. It preserves all text, images, links, and formatting from the original files so the merged result is identical to the source pages.

Benefits: No file size limits, drag to reorder pages, no uploads, instant processing, preserves original quality, works offline after the page loads, and handles mixed page sizes across different source PDFs.

Best for: Combining scanned documents, joining reports, merging presentation slides, assembling contract packages, consolidating invoices for bookkeeping, and bundling application materials into a single submission file.

Limitations and tradeoffs

PDFs merge in the order you arrange them in the list.
Encrypted or permission-locked PDFs may fail to merge.
Extremely large combined documents can take longer on low-power devices.

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