How many PDF files can I merge at once?

There is no hard limit on the number of files. You can merge as many PDFs as your browser's memory allows. For most use cases this is dozens of files.

Can I reorder the files before merging?

Yes. Use the up (↑) and down (↓) arrow buttons on each file row to set the order, or remove any file you decide not to include.

Will the formatting and images inside each PDF be preserved?

Yes. Pages are copied from the source PDFs exactly as they are, text, images, fonts, and layout are all preserved.

Do I need to create an account?

This tool is completely free and requires no account, login, or personal information.

Are my PDF files kept private?

Absolutely. All merging happens in your browser. Our servers are not involved at any point.

Merge Multiple PDF Files

Add as many PDF files as you need, drag them into order (or use the arrows), then download the merged PDF. All processing runs in your browser.

Drop PDF files here or click to browse

You can add multiple files

How it works

Each PDF you add is parsed by pdf-lib in your browser. The tool walks the list in the order you arranged the files, calls copyPages() to pull every page from each source document, and feeds them into addPage() on a new target document. Because pages are copied rather than re-rendered, fonts, images, and form fields from every source PDF survive intact in the merged file.

Processing runs in your browser

All merging happens inside your browser tab. pdf-lib combines your PDFs entirely in memory, with no network requests. You can confirm this yourselfin your browser's DevTools Network tab.

Related operations

For pulling out a single section before merging, try split PDF. To straighten sideways scans first, use rotate PDF. For shrinking the combined file, see compress PDF.

Frequently asked questions

How many PDF files can I merge at once?: There is no hard limit on the number of files. You can merge as many PDFs as your browser's memory allows. For most use cases this is dozens of files.
Can I reorder the files before merging?: Yes. Use the up (↑) and down (↓) arrow buttons on each file row to set the order, or remove any file you decide not to include.
Will the formatting and images inside each PDF be preserved?: Yes. Pages are copied from the source PDFs exactly as they are, text, images, fonts, and layout are all preserved.
Do I need to create an account?: This tool is completely free and requires no account, login, or personal information.
Are my PDF files kept private?: Absolutely. All merging happens in your browser. Our servers are not involved at any point.

Merge Multiple PDF Files

How it works

Processing runs in your browser

Related operations

Frequently asked questions

Related tools