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
Choose Files

How it works

Getting Started

Easily combine multiple PDF documents into one. Click ‘Choose Files’ to upload a PDF from your device or simply drag and drop it into the box.

Arrange PDFs

Use your mouse or touchscreen to rearrange the documents you wish to merge and place them in the desired order.

Run it Free of Charge

Forget about paid software, add-ons and hidden fees. AltoMergePDF enables you to process your documents for free.

Secure Data Processing

We use encrypted cloud storage to process documents you upload and merge. Each file is deleted from the server as soon as the job is done.

Compatible with Any OS

AltoMergePDF is a web-based platform. Therefore, it works equally well on any Internet-connected device regardless of its type (desktop or mobile) and OS.

Merge PDFs Online

Forget about storage space and memory being taken up on your device. Save free space and merge your PDF documents faster online.


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

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
I'm seeking a service that can help me to edit text in the PDF format. I mean, I have already installed a special software that can do this but I'm not really happy with the fact that I can use it only on my computer. I've heard about online platforms that provide tools to change files in many different ways. But also I've heard about the risks of online services (I mean getting malwares and so on). Are there any reliable websites? I'm also interested in the capability to convert formats, merge files, rotate pages of a document and so on. So the best option would be a service that provides all these features. Hope for some advice!
AltoPDF meets all your requirements. This service converts, merges, splits your documents, and rotates pages just in a few clicks. In addition, you can edit your PDF file, add text, fillable fields, images, links and so on. This platform is compatible with all major operating systems. And yes, you can access it from any internet connected device. AltoPDF is a secure platform and removes all processed files from the server so that no one can steal them.
By Louis on May 19, 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 guide

How to combine multiple PDFs into one document online:

  1. Open in your web browser.
  2. Click Choose Files to add PDFs stored on your hard drive.
  3. Import documents stored online by clicking one of the cloud storage service icons.
  4. Wait for your upload to complete, then click Merge PDFs Now!
  5. Choose what else you’d like to do with the resulting document.
  6. Click Continue Editing to edit, sign or share the document you’ve just created.
  7. Click Download PDF to save the document to your device’s hard drive.
  8. Click Start over again to merge another PDF file.

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.