🔗 How to Merge Multiple PDF Files into One Document

By the MZScan team · Updated 10 October 2026 · 3 min read

A job application with a CV, certificates and a cover letter, a report assembled from several chapters, or monthly statements you want to keep together: all of these are easier to handle as one PDF. Merging is simple when you know how to prepare the files first.

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Before you merge: check your files

Give files names that sort correctly, such as 01-cover, 02-cv, 03-certificates.
Make sure none of them is password-protected. Protected files cannot be opened by browser tools.
If a page is sideways, fix it first, see rotate PDF pages.

Step-by-step

Open PDF Tools and find the Merge PDFs card.
Choose two or more PDF files. The files are joined in the order you selected them.
Press Merge and download.
Open the result and scroll through it to confirm every page is there and in the right order.

Getting the order right

The merged file follows the order in which you selected the files. If the order is wrong, select the files again in the correct sequence. Selecting them one at a time is the most reliable way on a phone. On a computer you can select several in the file picker, but check the preview afterwards.

Merging photos and scans

If some of your pages are photos or scans rather than PDFs, convert them first with Image to PDF, and then merge everything. For paper documents, use the document scanner so the pages are clean and straight.

Keep the final file easy to share

Email services and application portals often limit attachments to a few megabytes. If the merged file is too large, rebuild the PDF from smaller images by reducing the pictures first with the image compressor.

Real-life examples

Job application: cover letter, CV, degree certificates and reference letters in one file, named with your own name.
University admission: transcripts, ID copy, photo page and statement of purpose combined as the portal requires.
Business paperwork: an invoice, the delivery note and the payment receipt sent together as one PDF.
Study material: chapters or lecture notes from different files merged into one revision pack.

After merging: a quick checklist

Open the file and check the page count against the sum of your sources.
Look at the first and last page of each original to see that nothing was cut off.
Check for duplicates and for pages that appear in the wrong place.
Rename the file with a clear, professional name.

Mistakes to avoid

Merging files that still contain private pages. Remove them first with delete pages.
Selecting files in the wrong order and sending without checking.
Including a draft version by accident. Keep a "final" folder with only the files you intend to merge.
Forgetting that a very large merged file may be rejected by email. Check the size limit.

Privacy

Merging happens inside your browser. Your files stay on your device.

Frequently asked questions

How many files can I merge?
As many as you like, as long as your device has enough memory.

Does merging change the quality of the pages?
No. The pages are copied into the new file as they are.

Is there a watermark?
The free version adds a small "mzscan.com" mark. Premium removes it.

Your files stay on your device. Nothing is uploaded.