gainup Private

Merge PDF Files Online

Combine multiple PDFs in the order you select them.

Processed locally. Never uploaded.

Drop files here

PDF ยท Up to 100 MB each

Files never leave your device

How it works

Done in three quick steps

  1. 1

    Choose two or more PDF files.

  2. 2

    Check their order.

  3. 3

    Merge and download one PDF.

About this tool

What you can do with Merge PDF

The PDF merger copies pages from multiple documents into one new PDF in the order the files are selected. Existing pages are preserved rather than converted to images, so text and vector content keep their original quality while processing stays in your browser.

Common uses

  • Combine invoices, receipts or statements into one file.
  • Assemble application documents in a required submission order.
  • Join report chapters or exported PDF sections for easier sharing.

Tips for better results

  • Select files in the exact order you want them to appear.
  • Unlock password-protected documents before attempting to merge them.
  • For very large documents, close unused tabs to leave more browser memory available.

Good to know

Frequently asked questions

Clear answers about privacy, quality and how this tool works.