How to Merge Multiple PDF Files into One

Have you ever needed to submit documents for an application or official procedure, such as your ID, a utility bill, and a signed form, only to find that each one is saved as a separate PDF file?

Sending three or four loose files via email looks untidy, and many job portals, universities, or government platforms provide only a single upload field. While various websites offer to combine files online, uploading bank statements, contracts, or identification documents to remote servers poses a serious privacy risk.

With PDF Engine, you can combine your documents directly on your Windows PC in seconds, securely and completely offline (without an internet connection).

PDF Engine Step-by-Step

1. Install PDF Engine for free from the Microsoft Store.

2. Open PDF Engine. You will see a welcome screen asking what you would like to do; click the Merge PDFs button (located under “Combine multiple files into one”).

3. Click the Browse folders… button inside the first box. A file browser window will appear showing your computer’s folders; select each PDF file you need to combine, then click Open (you can select up to 5 files at a time).

4. Document order is essential when submitting official paperwork:
   • Check the numbers shown beside each filename (1., 2., 3.…). This is the exact order they will follow in the final document.
   • If a file is in the wrong position, simply click and drag it up or down to place it where you want.
   • If you added an extra file by mistake, click the red ❌ button to its right to remove it from the list.

5. Once your files are in the exact order you need, click the large Merge PDFs button at the bottom. You will see a progress bar that completes the merge in just a couple of seconds.

6. When the process finishes, a confirmation window will let you know everything is ready. Click the Open Folder button. Your default Downloads/pdf_engine folder will open immediately, containing your new file named documento_unido.pdf. Double-click the file to verify that all pages are complete and in order.

That’s it! Your documents are now assembled into a single file ready to send, no monthly subscriptions required, and no need to risk your private information online.