Merge PDF Files

Combine multiple PDF files into one document online for free. Drag and drop to arrange the order.

Upload PDF Files

Drag multiple PDFs or click to browse

Browse files

How to Use

Upload all the PDF files you want to merge
Arrange them in the correct order
Click Merge PDFs
Download the combined PDF file

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Frequently Asked Questions

Is there a limit to how many PDFs I can merge?

No hard limit — all processing is done in your browser. However, very large or numerous PDFs may slow down your device. For best results, keep the total combined size under 100MB.

Will the formatting be preserved?

Yes! We use PDF-lib which preserves all content, fonts, and formatting from your original PDFs. Page sizes, embedded images, text layout, and links are all maintained in the merged output.

Can I merge PDFs with different page sizes?

Yes, you can merge PDFs with different page sizes (A4, Letter, etc.). Each page retains its original dimensions. If you need uniform page sizes, resize the individual PDFs before merging.

Is my data secure when merging PDFs?

Absolutely. The entire merge process runs in your browser using client-side JavaScript. Your PDF files never leave your device — no upload, no server processing, no data transmission.

Can I reorder pages before merging?

Yes, after uploading your PDFs you can drag to arrange them in the desired merge order. For reordering pages within a single PDF, use our PDF Page Reorder tool first.