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Merge PDF Files

Combine multiple PDF files into a single document - drag to reorder pages

PrivateNo upload

Drop PDF files here or click to browse

How it works
1

Select PDFs

Drop or browse for the PDF files you want to merge

2

Arrange Order

Files will be merged in the order shown in the list

3

Download

Get your combined PDF instantly - processed on your computer

Sign in to use Merge PDF

Your Documents Stay Confidential
  • Files never leave your computer - ideal for sensitive business documents
  • Secure sign-in with Google or email magic link
  • Free tier includes 2 downloads per day

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Merge PDF takes multiple PDF files you select or drop into the browser and combines them into one PDF, in the order you arrange them. Processing happens locally in your browser tab - files are never uploaded to a server, so it works with confidential documents and no file ever leaves your device. Each page keeps its original content, size and orientation; the tool does not resize, rotate or re-render anything, it only concatenates page data into a new document. The most common mistake is uploading files in the wrong order and not checking the arrangement before merging, since the tool combines files in list order, not alphabetical order.

Worked example

Input
Two files added in this order: Report.pdf (3 pages), Appendix.pdf (2 pages)
Output
One merged PDF with 5 pages: pages 1-3 are Report.pdf's pages 1-3, pages 4-5 are Appendix.pdf's pages 1-2, in that order.
Why
Merging concatenates each file's pages in full, in the order the files are listed, so the output page count always equals the sum of the input page counts.

How it works

Merge order follows file order
The output PDF is built by concatenating each input file's pages in full, in the order the files appear in your upload list. Reordering the files before merging (for example dragging one above another) changes the order pages appear in the final document; the tool does not alphabetize, sort by date, or infer an intended sequence.
Pages are combined, not redrawn
Each page is carried into the merged file as-is: text stays selectable, images keep their original resolution, and page size and orientation are preserved even when files differ, for example combining a portrait letter page with a landscape A4 page. The tool does not compress, flatten, or normalize pages during the merge.

When to use it

  • Combining a signed cover letter, a contract, and scanned ID pages into one PDF before sending it as a single email attachment
  • Assembling separate chapter or section PDFs from a long report into one complete document for distribution or printing
  • Merging several single-page scanned receipts or invoices into one file for an expense report submission

Worth knowing

  • Because merge order follows the order files are listed in, forgetting to rearrange them before merging produces pages in the wrong sequence; always check the file order shown before running the merge, not after.
  • Merging does not shrink file size: a merged PDF is roughly the sum of its input files' sizes, sometimes slightly larger, so combining many large scanned PDFs can still produce a large output file.
  • Password-protected or encrypted source files may not merge correctly, since the tool cannot read pages it cannot decrypt; if a file is skipped or the merge fails, remove that file's password first and try again.

Frequently asked

Will merging multiple PDFs reduce their quality or file size?
No. Pages are carried over exactly as they are in the source files, so image resolution and text stay unchanged. The merged file's size is roughly the combined size of the inputs, sometimes a little larger due to duplicated fonts or resources, not smaller.
Can I merge a password-protected PDF without entering the password?
No. If a source file is encrypted, the tool cannot read its pages to include them in the merge, and merging may fail outright or silently skip that file. Remove the password protection from the file first, then add it to the merge with the others.

References

All PDFb2 tools