DocuSizer

Merge PDF Files Online

Combine two or more PDF files into a single document. See a page preview of every file, drag to reorder them, and download the merged PDF - all without uploading to a server.

🔒100% private. All processing happens in your browser. Your images are never uploaded to any server.

How to Use Merge PDF

  1. 1

    Upload two or more PDF files - drag and drop or click to browse.

  2. 2

    Preview each file and drag the cards to set the merge order.

  3. 3

    Click "Merge PDFs" and download the combined document.

Frequently Asked Questions

Is there a limit on how many PDFs I can merge?

You can merge up to 20 PDF files at once.

Can I reorder the files before merging?

Yes - drag and drop the file cards, or use the up/down arrows, to set the exact order pages appear in the final PDF.

Does merging work with password-protected PDFs?

No, encrypted PDFs cannot be read in-browser. Remove the password first using a PDF editor, then merge.

Is my data uploaded anywhere?

No. All merging happens locally in your browser using JavaScript - your files never leave your device.

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