Merge PDF

Combine multiple PDFs in custom order. Processed locally in your browser—nothing is uploaded.

Convert, compress, merge, split, extract, and organize PDFs with practical browser tools and task guides.

How to use & FAQ

Why Tools Ku

100% free, no signup
Merge locally—files never leave your device
Drag to reorder before merging
Download instantly when done

Merging PDFs is one of the most common document tasks: attaching contracts, combining scanned pages, or assembling report chapters. Tools Ku runs entirely in your browser using pdf-lib—read, append, and export without sending files to a server.

Local processing is ideal for sensitive documents. No account required—open the page and start merging.

Steps

1Upload two or more PDF files by click or drag-and-drop
2Drag files in the list to set merge order
3Click merge and wait for local processing
4Download the combined PDF

FAQ

Are my PDFs uploaded to a server?▾

No. Merging happens entirely in your browser. Data is not sent to toolsku.com or any third party.

How many PDFs can I merge at once?▾

There is no hard count limit; practical limits depend on browser memory and file sizes. Keeping total size under a few hundred MB usually works best.

Will quality drop after merging?▾

No. Pages are copied and appended without recompression, so vectors and text stay sharp.

Can I change the merge order?▾

Yes. Drag items in the list—the output follows that order.

Can I merge password-protected PDFs?▾

If a PDF has an open password, decrypt it first with our PDF decrypt tool (when you know the password), then merge.

Does it work on mobile?▾

Yes on modern mobile browsers, though large files may be slower—Wi-Fi is recommended.