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PDF Merger

Combine multiple PDFs into one document. Drag files to reorder them.

Privacy • Terms

Blazing Fast

Because we process files in your browser, there is no upload time. Merging happens instantly.

100% Private

Your documents never leave your computer. We use local JavaScript libraries to merge files safely.

Easy Reorder

Simply drag and drop the thumbnails to change the order of your PDFs before merging.

The Complete Guide to Merging PDFs

Managing digital documents can be chaotic. You might have one PDF for a cover letter, another for your resume, and a third for your portfolio. Sending three separate attachments in an email looks unprofessional and is annoying for the recipient. The UniKit PDF Merger solves this problem by allowing you to combine an unlimited number of PDF files into a single, organized document.

Who Needs a PDF Merger?

  • Students: Combine lecture notes, assignment criteria, and your final essay into one submission file.
  • Business Professionals: Merge monthly invoices, receipts, and expense reports into a single financial packet for your accounting department.
  • Legal & Real Estate: Combine contracts, addendums, and ID scans into one comprehensive client file.

How It Works (Technically)

Most online PDF tools work by uploading your files to a server (a remote computer), processing them there, and then sending the result back to you. This is slow and raises privacy concerns.

UniKit is different. We use a technology called WebAssembly and a library called `pdf-lib` to read the binary code of your PDF files directly inside your browser's memory. The merging process happens on your own CPU. This means:

  1. Zero Data Leaks: Since the files aren't uploaded, they can't be intercepted or stored by us.
  2. No Size Limits: You aren't restricted by server upload caps (like 10MB limits). If your computer can open the files, we can merge them.

Frequently Asked Questions

Can I merge password-protected PDFs?

To merge a protected PDF, you must first unlock it. You can use our PDF Unlock tool to remove the password, and then come back here to merge it with other files.

Will the quality of my PDF decrease?

No. Our merger preserves the original quality of your text and images. We simply stitch the pages together without re-compressing the content.

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