Merge PDFs online, free and fast

The PDF merging process is an easy and simple task for those who use this service. The process is simple and intuitive, and in half of a minute, you get perfect results
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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:

How-to guide

How to combine multiple PDFs into one document online

  1. Upload a PDF by clicking Choose File.
  2. To upload another one, click Choose Files again.
  3. Click Merge PDFs Now! to start the process.
  4. Wait while the solution is processing the data.
  5. Download the result to your device or the cloud.

The Ultimate Features Comparison Chart

If you’re looking for the best tool for merging PDFs free and quick, you can stop here. The list below includes the best online document management tools. Compare them and pick one that can get what you need to be done, done.

Split PDF
Merge PDF
Combine & Reorder
Extract Pages
Compress PDF
Rotate PDF
No software downloads
Cloud storage Unlimited No info No info
Price Free Free 7-Day Trial paid Free 7-Day Trial paid
Encryption and security
Support 24/7/365 No info
No ads

Customer Reviews — Trusted by great people



What I like the most is undoubtedly the ability to merge docs without registering. Very fast and easy to use.



I have recently discovered this helpful tool and I’m pleased to use it. It’s free and availiable on my computer and phone. Now I can merge PDFs any time I need. It’s a time-saver!



This is a great tool for merging PDF files. Plus it’s free! What I like the the most is that it’s an online service that works through a web interface or its Google Chrome extension.

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How to Merge PDF Files

This is an online service for fast, free and easy combining several documents into the single one. Just import needed PDFs and combine a new file out of them.

How to merge PDFs Online

Combining one beautiful template from multiple files takes less than minutes with the proper tool. Take advantage of a cloud-native solution and get the ability to merge PDF files no matter what device you use.

Look at the brief-instructions below and learn on how to merge PDFs for free without the usual hassle:

  1. Find our website. Enter AltoMerge in the search bar and follow the link.
  2. Upload a document. Select a PDF that should be combined. 
  3. Upload another document.  Select another PDF that should be combined. 
  4. Combine them. Click Merge PDFs Now! and wait for the process bar to load.
  5. Download. Save the combined result as a new file. 

Use AltoMerge cause it's free, unlimited, and secure. Combine as many docs as you want and feel confident knowing that all your data is deleted once you refresh the page. Get started now without registering, installing, or purchasing anything.

BackgroundHow to merge PDFs Online


If you want to merge files quickly, use an online tool. Try out AltoMerge and get the ability to combine PDFs from anywhere, right from your desktop or mobile with a strong internet connection. Click Choose a File to upload one and organize its pages in the way you need them. Download your newly merged document for free.