Are my PDF files uploaded?

No. The merge happens entirely in your browser using the pdf-lib library. Your files never leave your device.

Can I change the order of the files?

Yes. Use the up and down arrows next to each file to arrange them, and the pages are combined in that exact order.

What about password-protected PDFs?

Encrypted PDFs can't be read in the browser, so they're flagged and excluded from the merge. Remove the password first, then add them again.

Will the quality or content change?

No. The pages are copied as-is into a new document, so text, images and layout are preserved.

Is there a file size or count limit?

There's no fixed limit, but everything runs on your device, so very large files depend on your available memory. Each file can be up to 100 MB.

Merge PDF Files

Drag & drop PDF files here, or click to choose

Multiple PDFs · processed on your device, never uploaded

Related external tools

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Adobe AcrobatThe gold standard for PDF editing, viewing, and creating. Convert, compress, sign, and annotate PDFs right in the browser without installing software. Trusted by businesses worldwide for professional document workflows.

Combine several PDF files into one, right in your browser. Add your PDFs, drag them into the order you want with the arrow buttons, remove any you don't need, and download a single merged document. Your files never leave your device — nothing is uploaded.

How to use

Drop your PDF files onto the box, or click to choose them.
Reorder the files with the up and down arrows, and remove any you don't need.
Click Merge & download to get one combined PDF.

Why merging on your device matters

Contracts, invoices and scanned documents are often private. Many online PDF mergers upload your files to their servers. This tool does everything locally in your browser with the open-source pdf-lib library, so your documents are never sent anywhere.

Features

Combine many PDFs

Merge as many PDF files as you need into one document in a single step.

Reorder before merging

Move files up or down so the final PDF is in exactly the order you want.

Remove unwanted files

Drop a file from the list before merging without starting over.

Page counts at a glance

See how many pages each PDF has and the total before you merge.

Private by design

Everything runs locally in your browser. Your PDFs are never uploaded to a server.

Common use cases

Application packets

Combine a form, ID copy and supporting documents into one file to submit.

Invoices & receipts

Bundle monthly invoices or receipts into a single PDF for accounting.

Scanned pages

Join pages scanned one at a time into a single, tidy document.

Chapters & reports

Merge separate chapters or sections into one finished report.

Notes & tips

Password-protected PDFs can't be read and are skipped — remove the password first.
Your original files are never changed; the tool creates a new merged PDF.
Very large or numerous PDFs depend on your device's memory, since everything runs locally.
Nothing is uploaded — your files stay in your browser.

Frequently asked questions

Are my PDF files uploaded?: No. The merge happens entirely in your browser using the pdf-lib library. Your files never leave your device.
Can I change the order of the files?: Yes. Use the up and down arrows next to each file to arrange them, and the pages are combined in that exact order.
What about password-protected PDFs?: Encrypted PDFs can't be read in the browser, so they're flagged and excluded from the merge. Remove the password first, then add them again.
Will the quality or content change?: No. The pages are copied as-is into a new document, so text, images and layout are preserved.
Is there a file size or count limit?: There's no fixed limit, but everything runs on your device, so very large files depend on your available memory. Each file can be up to 100 MB.