How to merge PDF files into one (and split them again)

Sooner or later everyone ends up with a pile of PDFs that belong together: a contract and its annexes, a month of invoices for the accountant, scanned pages of a form, the chapters of a thesis exported one by one. Sending five attachments is messy, and the person on the other side has to guess the order. Merging them into one PDF solves that, and the reverse operations (splitting, extracting and removing pages) let you shape the result exactly the way you need.

This guide covers the whole workflow: combining files, getting the order right, and then cutting a document back into the pieces you actually want to share.

Why merge PDFs instead of sending them separately

• One file is easier to read. The recipient opens a single document and scrolls from start to finish.
• The order is fixed. You decide what comes first, so annexes never end up before the contract.
• Uploads and forms often accept only one file. Many online portals, job applications and administrative forms have a single upload field.
• Archiving is simpler. One document per case, per month or per project is easier to find later than a folder full of fragments.

How to merge PDF files step by step

1. Open the Merge PDF tool.
2. Add two or more PDF files, either by dropping them in or by selecting them from your device.
3. Put them in the right order by moving each file up or down in the list.
4. Merge and download a single PDF that contains every page.

The merge happens entirely in your browser. Your files are never uploaded to a server, which matters when the documents include contracts, payslips, medical records or anything else you would rather keep to yourself.

Get the order right before you merge

The order of the files in the list is the order of the pages in the final document, so a minute spent here saves you from redoing the job. A few habits help:

• Name files with a number prefix before adding them, for example 01-contract.pdf, 02-annex-a.pdf. They are easier to spot and arrange.
• Think of the reader. Cover letter first, main document next, supporting material at the end.
• Check the first and last page of the merged file before you send it. That is where ordering mistakes usually show up.

Does merging reduce quality?

No. Pages are copied as they are, not re-rendered. Text stays selectable and searchable, links keep working and images keep their original resolution. The merged file is roughly the sum of the originals, so if the result is too large to email, compress it afterwards rather than before.

Splitting a PDF back into parts

Sometimes you need the opposite: one long PDF broken into smaller files. The Split PDF tool gives you two options:

• Leave the ranges field empty and every page becomes its own PDF.
• Enter page ranges such as 1-3, 4-7, 8 and you get one file per range: pages 1 to 3, pages 4 to 7 and page 8 on its own.

All the resulting files are delivered together in a ZIP, named in order. Page numbers start at 1, and ranges can overlap if you need the same page in several files. As with merging, the pages are copied exactly, so nothing is lost.

Keep only the pages you need

Splitting creates several files. If what you want is a single, shorter PDF with a selection of pages, use Extract PDF Pages instead. Type the pages to keep, for example 1-3, 7, and they are copied into a new document.

A useful detail: the pages are placed in the order you type them. Entering 3, 1, 2 creates a PDF that starts with page 3, followed by pages 1 and 2. That makes extraction a quick way to reorder pages inside a single file, too.

Remove blank or unwanted pages

Scans often come with blank backs, duplicated pages or a cover you do not want to share. Remove PDF Pages does the opposite of extraction: you type the pages to delete, such as 1, 4, 10-12, and download a clean copy with everything else left exactly as it was. At least one page has to remain, so you cannot empty a document completely.

A typical workflow

Say you need to send an application with your CV, a certificate and only the relevant pages of a long reference letter:

1. Use Extract PDF Pages on the reference letter to keep just the pages that matter.
2. Use Remove PDF Pages on the scanned certificate to drop the blank back.
3. Use Merge PDF to combine the CV, the certificate and the extracted pages in that order.

Three quick steps, one tidy document, and none of the files ever leave your device.

Frequently asked questions

How many PDFs can I merge at once? Each file can be up to 25 MB on the free plan. The number of files is limited only by your device's memory, and merging dozens of documents is normal.

Can I merge password-protected PDFs? Not directly. Password-protected PDFs must be unlocked first, then they can be merged like any other file.

Do I need to install anything or create an account? No. Everything runs in your browser, with no signup and no watermark.

Does it work on a phone? Yes. The tools run in any modern browser, on desktop or mobile.