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Merge PDF

Combine multiple PDF files into a single document. Free, fast, and private.

About Merge PDF

Combining PDFs is one of those tasks that comes up constantly — assembling a report from separate chapters, bundling receipts for an expense claim, or joining a signed signature page back onto a contract. This tool stitches any number of PDFs into a single document while preserving each page exactly as it was.

Everything runs locally in your browser using the pdf-lib library, so confidential files stay on your machine. Page order follows the order of the file list, and you can rearrange files before merging, so the output comes out exactly how you want the first time.

How to use Merge PDF

  1. 1

    Add two or more PDFs

    Select all the files at once or add them one by one — both work.

  2. 2

    Arrange the order

    Drag files up or down in the list. The final PDF follows this order from top to bottom.

  3. 3

    Merge

    Pages are copied into a single new document without re-compression, so quality is untouched.

  4. 4

    Download

    Save the combined PDF. The originals on your device are never modified.

Tips for better results

  • ✓Merging does not re-compress pages — if the result is too large, run it through Compress PDF afterwards.
  • ✓You can merge the same file twice, which is handy for duplicating a form.
  • ✓Password-protected files need to be unlocked first with the Unlock PDF tool.

Frequently Asked Questions

How many PDFs can I merge at once? +
There is no limit. You can merge as many PDF files as you need. The only constraint is your device memory, which can handle dozens of PDFs at once.
Can I reorder the PDFs before merging? +
Yes. After uploading, you can drag and drop the files in the list to rearrange them in any order before merging.
Will merging preserve hyperlinks and bookmarks? +
Yes, pdf-lib preserves the page content including text, images, and embedded fonts. Some complex interactive elements may vary.
Is there a file size limit per PDF? +
No server limits apply since everything runs in your browser. Very large files are limited only by your device RAM.
Are my files private? +
Completely. Nothing is uploaded anywhere. All merging happens locally in your browser using JavaScript.

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Your files never leave your device. All processing happens in your browser. No data is sent to any server.