Djvu

I don't know of any tools that will do the conversion for you. You certainly should be able to do it, but it might take a little work. I'll outline the basic process. You'll need the open source command line utilities pdftk and djvused (part of DjVuLibre). These are available from your package manager (GNU/Linux) or their websites (Windows, OS X).


I need to open DjVu files in my program, so I'm looking for some library. It must be free library, opensource would be better. When I tried to google it, I found only links to some books about .Net in *djvu format :D



djvu

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You could use ddjvu, in a shell script. That said, the output PDFs are much larger (x10), which makes it hardly worth the effort. Ubuntu has no problem reading djvu files, but if your reason is good enough, use the following script.


Simply run that in a folder with djvu files. The -scale=100 option downscales the output images, which makes the process much faster, and the output files' size more reasonable. Without it, the resulting PDFs were much larger then the originals, and took ages to convert, at least in my tests.


Personally I really like Calibre, which is a great for managing, converting, synching, sharing and editing ebooks. You can do batch conversions with it and djvu to PDF is supported.To install, just enter the following via cli:


My OS is [03/13/2020,14:35:06 ]$ uname -aLinux debian 4.19.0-8-amd64 #1 SMP Debian 4.19.98-1 (2020-01-26) x86_64 GNU/LinuxThat is, Debian 10 (Buster). When in Debian 9, I can make annotation in djvu file with Okular. But now I cannot. Below is a typical process of trial.


Start Okular. Open with Okular, a djvu file named 1.djvu. Now use Hilighter4 to make some annotation. Then close the file 1.djvu. Thus, a popup reads: Do you want to save your changes to "1.djvu" or discard them? (see screenshot)I choose "Save". Then another popup says:Warning-Okular You are about to save changes, but the current file format does not support saving the following elements. Please use the Okular document archive format to preserve them. So, I click "Use annotations", and then choose "Save as Okular document archive...". (See screenshot)Now also a popup reads "After saving, the current document format requires the file to be reloaded. Your undo/redo history will be lost. Do you want to continue?" I choose "Yes". (See screenshot) And the file 1.djvu is saved as 2.djvu. Now I open 2.djvu by Okular. But a popup reads "Could not open file:///.../2.djvu". See this. How can I solve this problem?


Unfortunately, I couldn't use the tool when searching among *.djvu files when searching by content. Taking into account the wide spread of *.djvu files among documents, books, and papers available via Internet, I would like to ask you, does there exist a way to search (contextually) among *.djvu files using Agent Ransack" or not. What about FileLocator Pro?


On Aurora OS there is no such thing as sailfish-office, but djvu viewer is still very welcome. So I finally made a DjVu Viewer as a separate app. The same app ported to Sailfish OS and published in Jolla Store.






DjVu.js is a program library for working with .djvu files online.It's written in JavaScript and can be run in a web browser without any connection with the server.It's absolutely open source and you can see the source code on GitHubAlso there is the DjVu.js Viewer, which allows you to view .djvu files online right in the browser.It's written in ReactJS and powered with DjVu.js library.

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