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ToolPika

Merge PDF

Add two or more PDF files, put them in the order you want, and merge them into a single PDF. Your files stay on your device.

Runs in your browser. Nothing you enter is sent to a server.

How it works

Each PDF is read in a background thread in your browser. The tool counts its pages so you can check you added the right files, then copies every page, in order, into a new document. The pages keep their original size, orientation and content, so you can mix A4 and US Letter pages or portrait and landscape documents.

The merged PDF downloads automatically as merged.pdf. If you close the download dialog by mistake, use Download again.

What is kept and what is not

Kept Not kept
Text, images and vector graphics Bookmarks (the outline in the sidebar)
Page size and rotation Interactive form fields
Selectable, searchable text Digital signatures (merging changes the document, so they would no longer be valid)
Links within a page Document title and author of the original files

Tips

  • Scanned pages are just images inside the PDF, so they merge fine but stay as large as the originals.
  • To put one file in the middle of another, you would need to split the second file first; merging adds whole files one after another.
  • Check the total page count before merging: it is the sum of all files and should match what you expect in the result.

Frequently asked questions

Are my PDF files uploaded?

No. The files are read and merged by your browser, on your device. Nothing is sent to a server, so it is safe for contracts, invoices, medical records or anything else confidential.

How do I change the order of the files?

Use the up and down arrows next to each file. The numbers on the left show the order the pages will appear in the merged PDF.

Is there a limit on the number or size of files?

Up to 30 files at a time, each up to 100 MB. Very large merges depend on your device's memory; on a phone, keep the total to a few hundred megabytes.

Can I merge password-protected PDFs?

No. Protected files have to be unlocked first, for example by opening them with the password and saving a copy without it. The tool tells you which file is protected.

Does merging reduce the quality?

No. Pages are copied as they are, without re-compressing text or images, so the merged file looks exactly like the originals.