How to Convert ACSM to Epub in 2020 | 3 Simple Steps

Tips and Tricks  •   June 22, 2020

Ever sat there, staring at the ACSM files in front of you and wishing there is way to convert those ACSM to epub so that you can read it on other readers?This is totally possible – in fact, there are even free ways to do it.

Before moving to the guides, please keep in mind that ACSM files are DRM-ed. To be able to change ACSM to Epub it involves 2 steps: remove ACSM DRM, and convert ACSM to PDF_EPUB_MOBI, etc.

In this ACSM to Epub guide We’ll cover:
What’s a ACSM File,
Get the ePub file from the ACSM
How to remove DRM from ACSM files with calibre and other tools
So, let’s get started with the basics!

What is ACSM? how to work with them?

Files come with the .ACSM extension is an Adobe Content Server Message file. It’s used by Adobe Digital Editions (ADE) to activate and download Adobe DRM protected content. Acsm file is not your actual eBook file but a download link that communicates with programs like Digital Editions to authorize you to download the actual book you’ve purchased.

ACSM files are always only at 2-3 KB, It you have properly set up Adobe Digital Editions you won’t see the ACSM file when you download an Adobe ebook. As Digital Editions will automatically transcode the eACSM file and download the PDF or ePUB file, which is the actual eBook.

What’s going on:
There are plenty of guides out there for converting ACSM to Epub, or converting ACSM to PDF. However, from the above we know the saying is not right, Because ACSM is not an actual eBook format, you can’t and don’t need to “convert” it to any eBook format. Just install and properly run Adobe Digital Editions it will generates the real book in PDF or Epub format to My Digital Editions.
But the PDF or ePUB file you get with Adobe Digital Editions are often protected by the Adobe DRM copy protection. So to play it on other players we need some tool to help us remove the DRM.

How to turn ACSM to ePub or PDF files:

Installing Adobe Digital Editions is the first necessary step for accessing and opening an ACSM file, it is the only way to authorize the computer to access the real file. So you really can’t convert ACSM to ePub without Adobe Digital Editions.

This software has been available to Windows and macOS, even has an Android or iOS version. So you can transform ACSM to ePub on any platform.

Adobe Digital Editions for Windows

Adobe Digital Editions for Mac

After downloading Adobe Digital Editions, please follow the below step to change ACSM to ePub:

1. Click “Help”-””Authorize compute””. Enter your Adobe ID and password In the opening window, then click “Authorize”.

3. Right click the ACSM file and select“”Open wit”” ->“”Adobe Digital Editions 4.5“

4. Adobe Digital Editions will immediately downloading the actual book from ACSM file ePUB or PDF format (depending on the source).

5. When downloading completed, you can see the ebook files on the “All Items” bookshelf. Right-clicking on the ebook and choose “Item Info”, it will show you the local folder of the saved file.

Now you have download and get the ebook from ACSM to Epub and PDF, just read it on Adobe supported devices like Sony eReader, Kobo reader, etc.

Remove DRM from the downloaded ACSM file

The EPUB or PDF file that you downloaded from the ACSM file is still locked to Adobe Digital Editions and its connected devices. If you want to read those book on Apple Devices like iPad, iPhone, or Amazon Kindle you need to remove the DRM protection applied to the downloaded ACSM PDF or Epub file.

Here we have 2 ways to remove the DRM from your ACSM files.

Method 1. Use The Best eBook DRM Remover

In most cases, we seek free or low-cost solutions and calibre is the tool that most tutorials show, but here I’d like to show the ebook converter I use which get the best results in the most efficient way.

The tool i use is Epubor Ultimate, it is dedicated ebook converter which specially developed for removing DRM from Kindle, Adobe, Google Play, Kobo & Nook eBooks and It combines the DRM removal and formats conversion perfectly.

Main Features of ePubor Ultimate

Supports up to 24 input formats, such as EPUB, KFX, AZW, AZW1, PRC, HTMLZ, Mobi, etc;
Remove DRM from Kindle, Adobe, Kobo & Nook eBooks;
Process and remove DRM from file in batches.
Supports Customize important metadata.
Support the latest version of Windows and Mac Catalina.

Steps to Remove DRM ePub from ACSM Files

Step 1: Download and install Epubor Ultimate on your mac or Windows;

Step 2: Run this program. it will detect all the ePub or PDF files you downloaded from ACSM file and display it in the left panel of the interface. You can simply drag the file from left panel to right panel to remove the DRM.

Step 3. Convert ACSM to EPUB/MOBI/PDF
If you want to change the file format for playing on iPhone or Kindle, you can set to change to format as EPUB_PDF_Mobi, etc. and click the Convert button.

Method 2. Use Calibre (Totally Free) — Windows, MacOS, and Linux

Calibre is the super star in eBook area, and It’s not surprising that we can convert ACSM to Epub and remove DRM with Calibre. Calibre itself doesn’t build in the feature to remove DRM but with a DeDRM plugin, it can do the wonders we need.

Follow the steps below to remove DRM protection from downloaded ACSM file.

1. Download and install Calibre;
2. The first thing we need to do is install latest version of DeDRM plugin from Apprentice Alf’s Blog.
3. Extract the zip file once it is downloaded.
4. Run Calibre, go to Preferences>Plugins

6. Click “Load plugin from file” button and open the DeDRM_calibre_plugin folder, and then select the file to install it. A security risk dialogue pops-up where you have to click Yes to proceed. After installing the plugin close Calibre and then restart it.

7. Click “Add books” to add eBook files to Calibre. The plugin will automatically strip the DRM from ebooks upon import.


If you have ACSM file, just use Adobe Digital Editions software to authorize and download ACSM to Epub or PDF, then read it on any Adobe Digital Editions enabled device.

Using Epubor Ultimate and Calibre also gives you the option to have your own ebook library that you can watch on other devices.

Are there any other alternatives ways? Sure. But these are the ones that I’ve used personally, and they really works. If you have other favorable solutions, or have solution that can convert ACSM to Epub without Adobe Digital Editions feel free to let us know in a comment.

Frequently Asked Questions

After publish this article I get many questions from People who get book in ACSM format, many of them ask the same questions, so I have listed the frequently asked questions below, hope it can help you when converting ACSM to Epub.

I have installed Adobe Digital Editions before how can I switch an account?
To Switch you Adobe Digital Editions account, press “Ctrl + Shift + D” (Mac: “Command + Shift + D”) to logout and re-authorize with the new Adobe ID.

I didn’t see the ebook files on the “All Items” bookshelf
If Adobe Digital Editions works properly and you can find the epub files from the locations below:
Windows: My Documents/My Digital Editions
Mac: Finder_Documents_Digital Editions

Do I required to use the same user ID, if I want to get the book on other devices?
Yes, Adobe’s DRM system requires one to authorize Adobe Digital Editions with the same Adobe ID on each computer/device.

When trying to download ACSM to ePub, I get and erro message which says: .epub and .acsm files are no longer associated.
For users who have two different versions of Adobe Digital Editions installed on the same device, they will get this erro. You only need to right click on the ACSM file and Select Open with > Choose Another App > Adobe Digital Editions.