How do I open a .djvu file? I did a search on it, but didn't find anything. What is the best program to open a .djvu file? - From MacRumors
I notice that a number of Mac users are looking for a way to open DjVu files on their Mac. Answers for this vary, Mac don’t have build in support for open DjVu files, even if you are running the Apple’s latest Mac OS Sequoia.
Don’t worry! This article will show you how to open DjVu files on a Mac using the FREE Mac DjVu viewer, which can open Djvu files smoothly and view them as breeze on Mac, besides Djvu, it also support opening files like Visio, XPS, WPS, WPD, Winmail, etc. Now, Let’s have a look at what DjVu files are first.
Cisdem Document Reader
Free Download macOS 10.10 or later
DjVu is a file format developed by AT&T Labs. it is mostly designed to store scanned documents. It is very similar to another popular file format - PDF. Though, DjVu files have a .DJVU or the .DJV file extension.
DjVu uses technologies such as image layer separation of text and background images, progressive loading, lossy compression, and arithmetic coding for bitonal images. Due to advanced compression algorithms, DjVu is ideal for high-quality, readable images to be kept in a minimum of space. A huge number of scanned books, magazines, manuals, photo books, etc. are stored in DjVu format.
DjVu is frequently used as alternatives to PDF files, it have higher compression and can save more space for scanned files and large eBooks. However, unlike PDF which can easily open on any operating system or web browser, a DjVu file needs special software to open.
Though DjVu allows for smaller file sizes without compromising image quality. it is not a commonly used format in our daily life, thus we have to open it with special software.
The quantity of Mac DjVu readers are not numbering in hundreds, it is quite easy to pick up the best one. As many authorities recommend, including The New York Times, Cisdem Document Reader is always selected as the best solution to open and view DjVu files on mac.
Cisdem Document Reader is a wonderful file and document reader for Mac. With it, you will never worry about how to view DjVu files on Mac. In addition to open DjVu files, it can also view WPD, WPS, XPS, OXPS, VISIO, PDF files in batches on Mac. It makes sure all elements in these documents are precisely presented, including original text style, images, graphics, tables, hyperlinks, layout and formatting.
Meanwhile, Document Reader offers you a wonderful reading experience using various viewing styles with toolbar consisting view mode, searching pane, page navigation, save, zoom, rotate, copy, etc. Users are able to design the toolbar according to their own wishes as well.
It can also save an DjVu file to a PDF file or images for easy reading and it supports all types of DjVu files like DjVu and Djv.
Free Download macOS 10.10 or later
Run Cisdem Document Reader, you will find a window as follow. Click “Open File” or drag and drop DjVu files directly to the window.
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After drag and drop, you will find the DjVu file is imported to the program fast. Utilize the toolbar accommodated on the top to view, zoom, rotate, bookmark, etc.
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Top open and view DjVu files in batch using Cisdem, you can click the “+” to import more DjVu files for viewing on mac.
If you also have the need to share DjVu file with others, you can also convert DjVu to PDF for better compatibility and easy sharing. Cisdem Document Reader can also help in converting DjVu to PDF or other image formats like PNG, JPEG, BMP, GIF, TIFF, etc.
Free Download macOS 10.10 or later 
1. Search within DjVu File
You can use Keyword Search function to retrieve the information you want promptly. The search box is in the upper-right corner and all contents those have mentioned this keyword will be showed in the left side of the window.
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2. Customize Toolbar
As we said before, Cisdem DocumentReader provides different page reading styles with toolbar consisting table of content, page thumbnail, searching pane, page navigation, zoom, rotate, save, etc.
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Also, you can watch following YouTube video to find all the features of Cisdem Document Reader.
DjVuLibre is an open-source suite for DjVu, it has DjVu viewers, browser plugins, and utilities for Windows, Mac and Linux. The software interface is very minimalistic, its update frequency is low, with the last update being on July 4, 2022. However, compared to other similar readers that are still stuck in 2009 or 2010, this is still a good option. And starting from version 3.5.21, the software also introduced a DjVu to PDF conversion feature, but it uses the tiff2pdf source code from libtiff. In other words, it will converts DjVu to TIFF first and and then to PDF, the result is that the original bookmarks, text layers, and other elements will disappear, and the resulting PDF is much larger than the original. However, as a completely free and open-source software, it is still worth a try.
How to open DjVu files using DjVuLibre:
If you are not going to install any DjVu readers on your mac, there is an alternative solution to open DjVu files on Mac without software installed—using online free DjVu viewer, like ofoct DjVu viewer. It allows opening local DjVu files or urls.
What if you need to open DjVu files on mobile phone, including Android and iPhone? You will need a DjVu reader for Android or iOS too. Of course, you can try to save the DjVu files as PDF by visiting djvu2pdf on your computer first, then sync the PDFs to your Android phone or iPhone and find a free PDF reader to view the DjVu files. Here, for both Android and iPhone users, we will recommend 2 best apps to open and view your DjVu files on your mobile phone.
EBookDroid may sound familiar to you, it is one of the most popular app to view different formats of files on Android phone or tablet. It has a 4.5/5 rating in Google Play, which proves its better performance than most of its competitors.
Main Features of EBookDroid for Android
To open DjVu files on iPhone, there are several choices. But here we recommend KyBook due to its high rating and good feedbacks from its users. It supports a lot of ebook formats and provides users with a flexible reading. It is free to use, but to read DjVu, CHM, you will need to perform an in-app purchase.
Main Features of KyBook DjVu Reader for iPhone
As Mac don’t have a default DjVu reader, opening DjVu files on Mac is a task that always requires a dedicated app. Tools like Cisdem Document Reader is the all in one app that can help you easily open batches of DjVu files at a time and also supports convert it to PDF or image format for easy sharing. Just as easily, you can also use it to open many other less common formats like Visio, Winmail, WPD, XPS, WPS, etc.
Another way to open DjVu files on Mac is to use online DjVu reader like ofoct. This way you can view DjVu files on any operating system and without installing any software, but as this is an online site, you have to be careful when uploading business or private files.
There are also apps that allow you to open DjVu files on iPhone or Android, you can easily download this apps on the App Store or Google Play.
Bianca is a senior tech editor and strategist at Cisdem with Over 10 years of experience on PDF related solutions which covers all document editing, annotating, converting and managing etc.
Samrat
LOVE this app. It really meets all my needs. I've tried dozens of DjVu reader apps before. DocumentReader beats them all. Keep up the great work.
Rykotic
Good stuff. Way better than the other djvu viewers on app store. More options, and significantly improved performance.
vivacer
Quick open djvu files on mac. Very convenient.Will use again and recommend to others.