Merge PDF

Combine multiple PDF files into a single document, in exactly the order you want.

About this tool

Merging PDF files is one of the most common document tasks: combining separate invoices into one report, joining chapters of a thesis, or assembling scanned pages into a single contract. ZiroPDF's Merge PDF tool lets you combine an unlimited number of PDF files into one clean document in seconds, completely free.

Unlike most online PDF mergers, ZiroPDF never uploads your documents to a server. The entire merge happens inside your browser using JavaScript, so confidential contracts, financial statements and personal records never leave your computer.

How to use Merge PDF

1

Add your PDF files

Drag and drop two or more PDF files, or click to browse your device.

2

Arrange the order

Use the arrows next to each file to put them in the exact order you need.

3

Merge and download

Click the button and your combined PDF downloads instantly.

Frequently asked questions

How many PDF files can I merge at once?
You can merge up to 50 files in one operation. Because processing is local, the practical limit is your device's memory rather than an artificial quota.
Will the quality of my PDFs change after merging?
No. Pages are copied into the new document without re-compression, so text, images and formatting remain identical to the originals.
Can I change the order of the files before merging?
Yes. After adding files, use the up and down arrows in the file list to arrange them in any order before you merge.

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