Merge Multiple PDFs into a Single File for Free

Easily combine multiple PDF files into one document. No signup or registration required.
Drag & Drop PDF Files Here
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How it works

How to Merge PDFs

There is no need to go through a maze of clicks to combine PDF documents. Just drag and drop your PDFs into the box above. You can add more docs if needed.

Manage Documents

Once your upload is complete, you can rearrange or delete your documents before you proceed.

Absolutely Free

Price is another advantage that makes Altomerge the right choice. There is no need to buy expensive software in order to combine your files. Altomerge is completely free.

Encrypted files transfer

We’ve set up an encrypted connection for securely uploading and transferring files. For additional protection, all files are deleted from our server after they're processed.

Compatibility with major platforms

Altomerge runs in a browser and works with all major operating systems like MacOS, Windows and Linux. You can merge PDF documents at any time from any internet-connected device.

Merging files in the cloud

Our app doesn’t consume storage space on your computer or device. All the tools exist in cloud storage and you can use them any time you need to combine PDFs.


File extension .pdf
Internet media type application/pdf
Description: The PDF format was released in the 1990’s. It was designed to unify the process of exchanging files and make it independent of installed software and operating systems. In comparison with other formats, PDF keeps the initial document structure unchanged. With PDF you don’t need to worry about how your file looks once it’s printed or opened with another program.
Technical Details: Every PDF file comprises of a full description of a 2D document with a fixed-layout. The document may include either vector or raster images, hyperlinks, buttons, text blocks, diagrams, etc. It also includes a font replacement technology that allows fonts to be stored inside of the document. Starting from the version 1.4, PDF format also supports graphics transparency.
Developed by ISO
Initial Release: 15 June 1993
Useful links:

Customer Questions and Answers

Hi all, I just have a little question here. How do I cut and paste text blocks from one PDF file into another one? It's not as simple as you think it is.
Of course not. But with a proper tool you are able to do this with very little effort. Go to, then drag and drop the two files you wish to work with to the workspace. Let the program process your PDFs and choose what you want to do next by pressing the Continue Editing button (the orange one).
By Larry on January 21, 2018
I’ve got an encrypted PDF which cannot be opened by any of the default applications I have on my PC. Is there a reliable solution I could use to work out this problem? Oh, and it would be just great if I could split my document into pages.
Hey, it seems like you’ve already answered your own question. If none of the apps on your computer are able to view an encrypted pdf, the best option would be trying an online app such as It is the best choice on the web so far. Simply upload files from your hdd or cloud storage and follow the instructions.
By Joe on April 16, 2018
Look. I want to find a service that can help me to combine different files into one file. I prefer online tools since my computer can hardly accept any software installation. Many thanks in advance.
What is the format of files you want to combine? For PDFs use the AltoPDF platform. This is a free, secure service that helps to convert, merge, split your files, rotate pages and so on. To combine files use the AltoMerge feature
By Robert on May 05, 2018
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How Do Users Rate AltoMerge?

Our service faciliates the work of over two million people merging PDF documents online every year.


How to Merge PDF Files

Today digital document management has become more popular than ever. People prefer saving and storing documents on their devices. This allows for important files to be accessible anywhere and anytime. In some cases you may need to make changes to your PDFs. In the past you had to print them out and create new documents by copy-pasting or typing the information all over again. Since technologies are constantly improving, on today's market there is a number of powerful tools that give you the ability to not only edit but also transform PDFs in different ways such as:

  • split them into separate units
  • merge them into a single file
  • convert to other formats like JPG, PNG, PPT, Word or Excel
  • rotate pages, etc.

Imagine a situation where you need to immediately combine several files and you don't have much time to scan them or don't have the appropriate equipment. With today's advanced online mergers, this is no longer an issue. Now you can easily create a single doc from several PDFs instantly, even while on the go.

How to Combine and Merge Files into One PDF?

Nowadays the market is overwhelmed by choice and sometimes it can be difficult to find the best tool, especially if you’re a first-time user. If you are hesitating to make a choice, look through the pros and cons of digital merging services:

  1. no need to download and install any additional software to change your documents or use storage space on your device
  2. most of them can be used completely for free
  3. intuitive and convenient interface that allows you to combine PDFs with ease
  4. step-by-step instructions with a logical sequence
  5. fast processing of your files without any worry of their security
  6. compatibility with all major OS’s such as Windows, Linux, Mac, Android and iOS
  7. optimization for mobile devices
  8. ability to merge pdf documents into one and store them in a cloud
  9. automatically updated features
  10. ability to edit a merged file according to your needs

The only thing you have to take into account is having a stable internet-connection.

According to the above-mentioned information, online PDF mergers are user-friendly. To get the desired result, you only need to complete a few simple steps:

  • first, open the specific online tool
  • after that, upload the units you want to merge from your device or cloud storage to a drag and drop box
  • once you’ve finished, click the “Start now” button to combine the pages
  • finally, download the newly created PDF to your computer, smartphone or tablet or save it to cloud storage
  • continue editing if necessary

How to merge PDF files without Acrobat?

If you opt for a digital service to merge your PDF files, you are definitely making the right choice.

  1. A document can be transformed in seconds without any supplementary applications.
  2. Moreover, online tools ensure the security of your PDFs.
  3. The online service features an encrypted connection for securely uploading and transferring files.
  4. All units are automatically deleted from a server after they`ve been processed.