PDF files are one of the most popular files that can be found all over the Internet. However, it is always possible to get the most out of them to handle them. And today you will learn how to convert PDF to image using the terminal.
The Linux terminal is a marvel where you can perform many tasks to be more productive at work. You can even extract each page of a PDF into an image that can be manipulated later.
To achieve this, you need certain tools available on Linux that, with a terminal interface, you can set up the necessary options to extract the pages.
To perform this tutorial, we can use two different tools, but that fulfill the objective to the fullest. They are pdftoppm and convert These tools are easily installable on Linux.
The pdftoppm command to convert PDF to Image
The pdftoppm command converts pages of PDF documents to image formats such as JPG, PNG, or others. Although it is not present by default in Linux distributions, it is easily installable.
This command is part of poppler which is a PDF rendering library based on the xpdf-3.0 code base. This library opens up many possibilities for editing PDF files.
Therefore, it is necessary to download and install
poppler on your system to enjoy pdftoppm.
First open a terminal and update your system, then run one of these commands
#For Debian, Ubuntu, Linux Mint and the like sudo apt install poppler-utils #On RHEL, CentOS or Fedora based systems sudo dnf install poppler-utils #On SUSE and OpenSuse sudo zypper install poppler-tools #On Arch Linux, Manjaro and derivatives sudo pacman -S poppler
Now, with the command installed, you can use it.
Using pdftoppm command to convert PDF to images using the terminal
The basic syntax of the command is as follows
pdftoppm -[image_format] [pdffile] [image_name]
It supports export to PNG or JPG, so you can choose. You can also use an absolute path to define the input PDF file, as well as an absolute path for the output.
An example of how to use it would be to run
pdftoppm -png sample.pdf sample_image
This will generate an image file for each page of the PDF file (sample-image-01, sample-image-02, … ). Therefore, the most logical option is to set a range of pages to convert.
To achieve this, follow this syntax
pdftoppm -[image_format] -f [first-page-toconvert] -l [last-page-to-convert] [pdffile] [image_name]
pdftoppm -png -f 1 -l 5 sample.pdf image
In this case, an image file of pages 1 to 5 of the document named
sample.pdf will be created.
By default, pdftopm uses 150 Dpi, which is sufficient for most cases. However, it is also possible to modify this value to increase the quality of the resulting image.
This can be achieved with the
ry options, which set the amount of horizontal and vertical pixels.
pdftoppm -png -rx 300 -ry 300 sample.pdf sample_image
So, the image quality will be higher, but the weight of each file will be higher as well.
The convert command on Linux
The convert command is part of imagemagick. ImageMagick is a free and open-source software suite for displaying, converting, and editing raster image and vector image files. It can read and write over 200 image file formats.
So to edit and work with images, it is necessary to use this tool on Linux. Well, it has a command that allows you to make a PDF file to be exported into different image files.
First, you will have to install it
#Debian, Ubuntu and derivatives sudo apt install imagemagick #On RHEL, CentOS or Fedora based systems sudo dnf install ImageMagick ImageMagick-devel ImageMagick-perl
Once it is installed, you can use it.
Using the convert command to convert PDF to images using the terminal
The syntax of this command is quite simple to use.
convert [pdf-file] [output].[format]
convert sample.pdf output.jpg
In this case, each page of the
sample.pdf file will be exported in several files starting with
You can also specify a specific page
convert sample.pdf output.png
In this case, page 44 will not be converted but page 45 since the count starts at 0.
Finally, you can change the quality of the exported image with the options
convert -density [value] [pdf-file] -quality [value] [output].[format]
-density changes the Dpi of the image. The most commonly used values are between 150 and 300. And
--quality sets the compression level of the image, where 100 means that there is no compression and therefore the quality is higher.
Manipulating PDF files can be a headache, but thanks to external tools you can even convert them to images.
I hope you liked this post and can share it with all your friends.