Are my PDFs uploaded to a server when merging?

No. Merging executes 100% locally inside your browser tab using client-side JavaScript (pdf-lib). Confidential contracts, payslips and client dossiers never leave your computer.

Merge PDF

Combine multiple PDF documents into a single file in seconds and reorder pages.

Choose PDFsProcessed on your device — never uploaded.

Direct answer

Merge multiple PDF documents into a single PDF directly in your browser using WebAssembly/JavaScript (pdf-lib). Zero files are uploaded to any server, satisfying strict Swiss nDSG and enterprise privacy rules.

How it's calculated

Select or drag-and-drop two or more PDF files.
Reorder files with the up/down controls.
Pages are copied locally in memory via pdf-lib and downloaded as merged.pdf.

Frequently asked questions

Are my PDFs uploaded to a server when merging?: No. Merging executes 100% locally inside your browser tab using client-side JavaScript (pdf-lib). Confidential contracts, payslips and client dossiers never leave your computer.