Merge PDF Files

Combine multiple PDF documents into a single file. Free, private, and 100% client-side.

Select files to begin

How to Merge PDF Files Online (Free & Private)

Merging multiple PDF documents into a single file is essential for organizing reports, combining agreements, or cleaning up your digital workspace.UnitMaster PDF Merger allows free users to combine up to 2 files. Upgrade to Pro for unlimited batch merging and instant processing.

Frequently Asked Questions

How to Merge PDF Files Offline

Merge multiple PDF documents into a single file without uploading them to a cloud server. UnitMaster uses your browser's built-in PDF engine to combine files locally, ensuring 100% privacy for your sensitive contracts, reports, and receipts.

100% Private (No Server Uploads)

Your files never leave your device. All processing happens locally in your browser.

Unlimited Files & Size

Since it runs on your machine, there are no artificial limits on file count or size.

Drag & Drop Reordering

Easily arrange your PDF pages visually before merging them.

Works Offline (PWA Support)

Install UnitMaster as an app and merge PDFs even without an internet connection.

Why choose UnitMaster?

  • Your data never leaves your device.
  • Arrange pages exactly how you want them.
  • Instant processing - no upload wait times.
  • Free for commercial use.

Frequently Asked Questions

Privacy Dashboard

Processing ModeOffline Ready
Client-Side (WASM)

Calculations happen locally. No data sent to servers.

Network Requests
DESTINATION
STATUS
AnalyticsAllowed
AdSenseAllowed
File UploadsNone

Incognito Mode

Merge PDF Files Offline - Private & Secure | UnitMaster | UnitMaster PDF Tools