DiffPDF is a small but useful tool that compares two PDF files and let you know the differences. This easy to use tool is free for Linux. If you often read books then you can compare for changes in the paragraph and other deep aspects. Let's see how to install and use DiffPDF in Linux distributions including Ubuntu, Debian, PCLinuxOS and Fedora.
By default DiffPDF compares two files by text but if you want you can also compare graphics of the two files. For example, if there are graphs in the PDFs then you can compare those graphs also and DiffPDF will specify the differences.
For comparing text of two PDF files, first insert file File#1 and File#2 and from right sidebar select 'Words' from Compare drop-down list. Select view of the files and use preview and next button to see next changes in the PDFs.
If you want to compare also want to compare images of the PDFs then select 'Appearances' from Compare drop-down list from right sidebar. You can also compare the two PDFs Characterwise. Just select 'Characters' from Compare drop-down list. When you have set everything click compare button from bottom of sidebar. You'll notice changes in the highlighted texts.
If you want to change the highlighted color of texts then click 'Options' and from Highlighting tab change coloring to your wish.
How To Install DiffPDF In Linux Distributions
$ sudo apt-get install diffpdf
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