Combining PDF files is one of the most common administrative tasks, yet most operating systems don't make it obvious how to do it. While Adobe Acrobat comes with a hefty subscription fee, UnitMaster allows you to do it for free, directly in your browser.
Why Merge PDFs?
- Organization: Keep related documents (invoices, receipts, contracts) in a single file.
- Sharing: Send one attachment instead of five separate emails.
- Portfolios: Combine your resume, cover letter, and work samples.
The UnitMaster Way (Private & Secure)
Most "Free PDF Mergers" upload your files to their backend servers to process them. This creates a privacy risk for sensitive documents like bank statements or legal contracts.
UnitMaster is different. We use a technology called WebAssembly to run the PDF processing engine inside your web browser.
Step-by-Step Guide
- Go to the Tool: Open our PDF Merger.
- Select Files: Drag and drop your PDF files. You can select multiple files at once.
- Reorder: Need the cover page first? Simply drag and drop the thumbnails to rearrange the page order.
- Merge: Click "Merge PDF". The browser will instantly combine the bytestreams and generate a new file.
- Download: Save your new document.
Alternative Methods
On macOS (Preview)
- Open the first PDF in Preview.
- Enable "Thumbnails" view.
- Drag the second PDF file into the thumbnail sidebar.
- Save.
On Windows
Windows 10/11 doesn't have a built-in PDF merger. You would typically need to download software. UnitMaster saves you this installation step by running in Edge or Chrome.
Recommended Tool
Merge PDF Tool: Combine your PDFs instantly.