You have three invoices, a contract, and proof of payment, each in its own PDF, and you need to send everything to your accountant in a single, neat document. This is a situation that comes up every week in offices in the Mauricie region, and the good news is, you don't need any expensive software to do it.
Merging multiple PDF files into one takes less than two minutes once you know the right method. This guide shows you how to do it for free on Windows, how to keep your documents confidential in the process, and which approach to choose depending on whether you're processing a simple invoice or a sensitive client file.
Quick answer: To merge PDFs for free, use a free offline application like PDF24 or PDFsam: drag and drop your files, arrange them in the desired order, and click Merge. For non-confidential documents, an online tool like iLovePDF will do the job in seconds. Avoid uploading sensitive documents to unknown websites.
1. Why merging PDFs is so useful
A single file is simpler to send, organize, and retrieve. Instead of attaching five files to an email, you send just one, in the correct order, without the risk of a page getting lost in transit. For an SME, this reduces back-and-forth communication and filing errors.
The most frequent cases we see with our clients:
- Grouping multiple invoices or receipts for month-end accounting.
- Combine a contract, its annexes and proof of signature into a single file.
- Assembling paper scans (each page often comes out as a separate file).
- Prepare a complete file to send to a client, supplier or insurer.
In short, as soon as you are handling more than two PDFs that go together, merging them saves you time and gives a more professional image.
2. The fastest method: a free online tool
If your document isn't confidential (for example, a leaflet, a menu, or a public guide), an online tool is unbeatable in terms of speed. Free sites like iLovePDF or Smallpdf do the job directly in your browser, without requiring any installation.
The steps
- Open the site in Edge, Chrome or Firefox and choose the "Merge PDF" option.
- Drag your files into the window, or click to select them from your computer.
- Rearrange the thumbnails to put the documents in the correct order.
- Click on "Merge", then download the resulting single file.
It's free for a few files per day. The only drawback, and it's an important one, is that your documents pass through a third-party server. For a client contract, a pay stub, or anything containing personal information, this isn't the right option. The Canadian Centre for Cyber Security reminds users never to upload sensitive data to services whose practices they don't know. We'll come back to this in section 5.
3. The confidential method: a free offline application
For anything involving company or customer data, we recommend a free application that runs directly on your computer, without sending your files over the internet. Two reliable and free options are PDF24 Creator and PDFsam Basic.
With PDF24 Creator
- Install the free application, then open the "PDF Toolbox".
- Choose "Merge PDFs".
- Drag and drop all your files, arrange them, and then click "Merge".
- Save the new file to your computer or to your OneDrive.
The advantage is twofold: your documents never leave your device, and the tool also offers compression, splitting, and password protection features. For companies already using Microsoft 365, you can then store the final file in SharePoint or OneDrive and share it properly. The official Microsoft 365 explains how to manage and share these documents as a team.
If you want to go further and have your clients sign these PDFs without printing a single page, this is exactly the kind of workflow we implement in our IT services for SMEs in Trois-Rivières.
4. Merge PDFs on Mac and phone
The need isn't limited to Windows. Here are some useful shortcuts if you're working on another device.
On Mac
No need to install anything. Open the first PDF in the Preview app, view the thumbnails, then drag a second PDF into the sidebar. Rearrange the pages, then use "File" and then "Export" to save everything as a single document.
On iPhone or Android
The iPhone's Files app lets you select multiple PDFs, then choose "Create PDF" to combine them. On Android, the Google Drive or Files app lets you combine scans taken with the camera. This is handy when you're scanning receipts on the go, as we explained in our quick tips on mobile scanning.
5. A safety precaution that should never be forgotten
Merging PDFs is a simple operation, but choosing the right tool is not. When you upload a file to a free website, you're trusting a stranger to process, and sometimes store, the contents of that document. For a Quebec-based SME, this can represent a real risk of personal information leaks.
Our simple recommendations:
- Sensitive documents (contracts, payroll, customer data, HR files): only with an offline application on your computer.
- Public documents (leaflets, guides, menus): an online tool is acceptable.
- Check that the site is using "https" and that it indicates that it deletes files after processing.
- Never reuse the same password to protect your PDFs and for your business accounts.
To help you implement these practices effectively across your organization, the Canadian Centre for Cyber Security publishes clear guides on document and data protection. And if you'd like a policy tailored to your specific situation, speak with our team.
Frequently Asked Questions
Is it possible to merge PDFs for free without installing any software?
Yes. Online tools like iLovePDF or Smallpdf merge your PDFs directly in your browser, without installation. However, reserve them for non-confidential documents, as your files are transmitted via an external server.
How can I keep my documents private during the merger?
Use a free application that works offline, such as PDF24 or PDFsam. Your files remain on your computer and are never sent over the internet, which is essential for contracts and customer data.
Can Windows 11 merge PDFs without a third-party application?
Windows 11 can create and print PDFs, but it doesn't offer a built-in function to combine multiple existing files. A small, free application remains the simplest and most reliable solution for merging them.
Help with your documents in Trois-Rivières
Merging PDFs is just one example of the dozens of small tasks that eat up time every week in a small business. If you want to automate your document management, secure your documents, and enable paperless signing, discover our IT services for small businesses, or contact the OKTO Solutions team in Trois-Rivières for support tailored to your specific needs in the Mauricie region and throughout Quebec.