Merge PDF files online, in the order you choose

Choose multiple PDFs, arrange their order, and export one file. Everything runs locally in your browser with no upload or account.

Start merging PDFs · View all PDF tools

Merge a PDF in three steps

1. Choose or drop multiple PDFs.
2. Drag files or use the arrows to arrange their order.
3. Name and download the merged PDF.

Supported format and processing

Input and output are PDF (.pdf). Files are read and processed in the current browser, never overwrite the originals, and can be reordered with drag and move controls.

Common use cases

• Combine contracts, quotes, terms, and attachments.
• Organize reports, covers, appendices, and data sheets.
• Combine papers, lecture notes, and references.
• Join scans, invoices, and expense documents.

Private by design

PDF Lab is a front-end-only app. Your browser reads, copies, and exports the pages on your device. There is no upload endpoint, server copy, or account requirement.

Frequently asked questions

Are files uploaded to a server?

No. Files are processed only in the current browser.

Does merging reduce quality?

No. Page content is copied without re-rendering it.

What other tools are available?

Split PDF, optimize PDF, extract pages, remove pages, rotate pages, add a watermark, add page numbers, and edit metadata all run locally in your browser.