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Merge PDF

Combine multiple PDF files into a single document in your browser. Drag to reorder pages, then download the merged PDF — uses pdf-lib, no upload needed.

Used 15.0K times today

How to Use Merge PDF

  1. 1

    Add your PDF files

    Click the upload area or drag and drop two or more PDF files. Files are loaded into the browser using pdf-lib and never sent to a server.

  2. 2

    Arrange the order

    Drag and drop the file cards to set the order in which PDFs will be merged. Each card shows a preview of the first page.

  3. 3

    Download the merged PDF

    Click the Merge & Download button to combine all files into a single PDF and save it directly to your device.

Frequently Asked Questions

How many PDFs can I merge at once?
You can merge as many PDFs as your browser memory allows. For very large files (100+ pages each), processing may take a few seconds longer due to client-side memory constraints.
Will the merged PDF lose quality?
No. pdf-lib combines PDFs by copying the original page streams directly without re-encoding or compressing images, so output quality is identical to the source files.
Can I merge password-protected PDFs?
Password-protected PDFs must be unlocked before merging. If you have the password, the tool will prompt you to enter it; otherwise the file cannot be processed.

About Merge PDF

The Merge PDF tool on Utilko combines multiple PDF documents into one using the pdf-lib library, entirely within your browser. There are no file size limits imposed by server quotas, no watermarks added to your output, and no data ever leaves your machine — making it the most private and unrestricted PDF merger available online.

The drag-and-drop reordering interface lets you arrange files in exactly the sequence you need before merging, giving you full control over the final document structure. Use it to assemble reports from multiple sources, bundle invoices, or compile a portfolio from separate PDF chapters.

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