How to Merge PDF Files on Any Device

To merge PDF files means combining two or more documents into a single PDF, in the order you choose. It is one of the most common PDF jobs: joining scanned pages, putting a CV and cover letter together, or sending one tidy attachment instead of five. Below you will find how to do it on Windows, Mac, iPhone and Android, plus tips to avoid the usual mistakes.

When merging PDFs is useful

• Job applications. Many portals accept a single file, so your CV, cover letter and certificates must travel together.
• Official forms. Visa, university and government websites often want all supporting documents in one upload.
• Invoices and receipts. An accountant will usually prefer one monthly file over a pile of separate ones.
• Scans. Phone scanning apps sometimes save each page as its own PDF.
• Reports. A cover page, the main report and an appendix made in different programs can become one document.

How to merge PDF files online with FileKiwi

This method works the same way on every device with a modern browser, so it is the easiest one to remember.

1. Open the Merge PDF tool.
2. Add your files. You can drop up to 50 PDFs at once.
3. Drag the files into the order you want. The first file in the list becomes the first pages of the result.
4. Click Merge and download your new PDF.

The merging happens inside your browser with an open source PDF library. Your documents are not uploaded, which matters for contracts, IDs and bank statements. Pages are copied exactly as they are, so there is no quality loss, and every page keeps its original size.

There is no account to create and no watermark stamped on your pages. When you close the tab, nothing is left behind on a server.

How to merge PDFs on Windows

Windows has no built in tool that joins existing PDFs. Microsoft Print to PDF can save a document as a PDF, but it cannot combine several PDF files into one.

Your options are a desktop PDF editor or a browser tool. On a work or school PC where you are not allowed to install software, the browser is often the only route. Open Edge or Chrome, go to the Merge PDF page and follow the steps above.

How to merge PDFs on a Mac

macOS includes two handy ways to combine PDFs without extra apps.

With Preview

1. Open the first PDF in Preview.
2. Choose View, then Thumbnails, to show the page sidebar.
3. Drag the other PDF files from Finder into the sidebar, at the spot where they should appear.
4. Choose File, then Export as PDF, to save the combined document as a new file.

Exporting to a new file keeps your first PDF unchanged, which is safer if you make a mistake along the way.

With Finder Quick Actions

Select the PDFs in Finder, right click (or Control click), then choose Quick Actions and Create PDF. Finder joins them in the order they appear in the window, so sort or rename the files first.

How to merge PDFs on iPhone and iPad

The Files app can combine documents on recent versions of iOS and iPadOS.

1. Open Files and go to the folder with your PDFs.
2. Tap the More button (three dots), tap Select, and pick the files.
3. Tap More in the bottom corner and choose Create PDF.

Files saves the new PDF in the same folder. If you want full control over the order, the browser tool is easier, because you can drag the files into place before merging. It runs in Safari, so there is no app to install.

How to merge PDFs on Android

Android has no standard built in way to merge PDFs, and the options differ between phone brands. The simplest path is Chrome: open the Merge PDF page, tap to choose files from your phone or from Google Drive, reorder them and download the result to your Downloads folder.

Tips for a clean merged PDF

Number your files first

Start file names with numbers, such as 01 cover.pdf, 02 report.pdf and 03 appendix.pdf. Most tools list files by name when you add them, so the order is right from the start and you only need to check it.

Fix rotation and extra pages

A sideways scan looks odd inside a neat document. Use Rotate PDF to turn individual pages, and Delete PDF Pages to drop blank or duplicate ones. You can do this before or after merging.

Mixed page sizes are normal

If you merge an A4 document with a US Letter one, each page keeps its own size. PDF viewers handle this without problems, and printers usually scale each page to the paper in the tray.

Watch the file size

A merged file is roughly the size of all the originals added together. Ten scanned pages can easily go over an upload limit or an email attachment limit. Shrink the result with Compress PDF, and read how to compress a PDF for online forms for practical size targets.

Turn photos into a PDF first

If some of your documents are JPG or PNG photos, convert them with JPG to PDF first. Then merge that PDF with the rest, so everything ends up in one file.

Remove passwords before merging

A PDF that asks for a password when you open it cannot be combined until the protection is removed. Open it in a program where you can enter the password, save an unprotected copy, then merge that copy.

Merging and splitting work together

Merging and splitting are opposite jobs that often go hand in hand. Maybe you need pages 1 to 3 of one contract and all of another. Use Split PDF to pull out the pages you need, then merge the pieces into one clean file.

The same idea helps when you send documents to different people. Keep one complete merged file for your records, and split out only the pages each person actually needs.

Check the result before you send it

A quick review takes a minute and saves an awkward follow up email. Open the merged PDF and scroll through it once from start to finish.

• Page count. Add up the pages of the original files and compare the total with the new document.
• Order. Make sure the cover or first document really comes first.
• Orientation. Look for pages that appear sideways or upside down.
• File name. Give the file a clear name, such as your name and the document type, so the person who receives it knows what it is.

Is it safe to merge PDFs online?

It depends on where the work happens. Some online tools send your files to a server for processing. FileKiwi merges PDFs locally in your browser, so the documents stay on your own device the whole time.

That makes it a sensible choice for private papers such as payslips, medical letters or signed agreements. Still, keep the original files until you have opened the merged PDF and checked that every page is there and in the right order.

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