Is there a limit on the number of files?

No limit on the number of files, but it's recommended to merge no more than 50 files at once to ensure processing speed.

What about the quality of the merged PDF?

It is identical to the original files with no loss of quality.

Merge PDF

100% local processing

Drag and drop PDF files here

Supports uploading multiple files at once

File list

No files yet. Drag and drop or select PDF files to start

Frequently Asked Questions

Absolutely safe. All processing is done in your browser, and PDF files never leave your device.

What is PDF Merging?

PDF merging is the process of combining two or more separate PDF files into one file in a specified order. Whether organizing scattered contracts, invoices, and scans into a complete document or compiling multiple chapters into an e-book, merging makes file management more efficient and sharing easier.

qktools' merging tool runs entirely in the browser: files are not uploaded to any server, and it doesn't rely on the network. It can be used even offline, with processing speed depending only on your computer's performance. No matter how many or sensitive the files, there's no need to worry about privacy leaks.

How to Merge PDF Files

1Click the upload area or drag multiple PDF files directly onto the page.
2Drag files to adjust their order and remove any unwanted files at any time.
3Set the page orientation and size as needed, then click the 'Merge PDF' button to complete the merging locally.
4Download the merged single PDF file; the entire process keeps files on your device.

Why Choose Our Merging Tool

Privacy First: All processing is done locally in the browser, with zero file uploads, so sensitive materials never leave your computer.

Blazing Fast Processing: No need to wait for uploads or downloads; merging happens locally, and even large files are processed quickly.

Completely Free: No file limits, no watermarks, no registration required, and unlimited usage.