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Merge PDF

Add files, drag to set the order, then merge into a single PDF.

Drop PDF files to merge

or browse your device

PDF — add 2 or more files

How to merge PDF files

Combine two or more PDF files into a single document, in exactly the order you want. Merging PDFs is handy for joining chapters, invoices, scanned pages or contracts into one tidy file — and with pdfcdf it all happens in your browser, so your files stay private.

  1. 1Open the Merge PDF tool and drop in the PDF files you want to combine.
  2. 2Drag the files to set the order — they combine from top to bottom.
  3. 3Click “Merge PDF” and download your single, combined PDF.
Read the full Merge PDF guide →

Merge PDF files without uploading them anywhere

Most online PDF mergers work by uploading your documents to a server, combining them there, and sending the result back. pdfcdf works differently: the merge happens entirely inside your browser, on your own device. Your contracts, bank statements, medical records or client files are never transmitted, stored or seen by anyone — which also means there is nothing to delete afterwards and no retention policy to worry about.

Because there is no upload or download round-trip to a server, merging is also fast: even large documents combine in seconds, limited only by your own device. It works the same whether you are on a work laptop with a strict data-handling policy, a Chromebook, or your phone.

When merging PDFs comes in handy

Combine scanned pages into a single document, join monthly invoices or receipts into one file for bookkeeping, assemble chapters or essays into a submission, stitch a cover letter and CV together for a job application, or gather signed contract pages back into one clean PDF.

Files merge in the order you arrange them, top to bottom, and you can mix documents of different page sizes freely. If you also need to reorder or remove pages inside a document after merging, the Organize Pages and Delete Pages tools pick up right where Merge leaves off.

Frequently asked questions

Can I change the order of the files before merging?
Yes — drag any file up or down in the list (or use the arrows). The final PDF follows the top-to-bottom order you set.
Is there a limit on how many PDFs I can merge?
No fixed limit. Because merging runs on your own device, you can combine as many files as your browser can comfortably handle.
Does pdfcdf add a watermark to the merged PDF?
No. The merged file is exactly your pages, combined — no watermark, no branding, no page limits, and no sign-up to remove anything.
Can I merge PDFs on my phone or tablet?
Yes. The merge tool works in any modern mobile browser on iPhone, iPad and Android — open the page, add your files and download the combined PDF. No app to install.
Will merging reduce the quality of my PDFs?
No. Pages are copied into the new document as-is rather than re-rendered, so text stays sharp and images keep their original quality. Pages with different sizes are kept at their own size.
Is pdfcdf free to use?
Yes. Every tool on pdfcdf is completely free, with no account, no watermarks, and no limits on how many files you process.
Are my files safe? Do they get uploaded?
Your files never leave your device. Every tool runs entirely in your browser, so your documents are processed locally and are never uploaded to a server or seen by anyone.
Do I need to create an account or sign up?
No. pdfcdf works instantly with no sign-up, no email, and no software to install — just open the tool and go.
Does it work on mobile phones and tablets?
Yes. pdfcdf runs in any modern browser on phones, tablets, Mac, Windows and Linux — nothing to download.

Merge PDF files on your device

Where the file saves and what your operating system can do on its own both change from device to device. These guides cover the specifics:

Merge PDF on iPhoneMerge PDF on AndroidMerge PDF on MacMerge PDF on WindowsMerge PDF on ChromebookMerge PDF on iPad

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