Merge multiple jpg into single pdf in Linux
LinuxShellUbuntuLinux Problem Overview
I used the following command to convert and merge all the jpg
files in a directory to a single pdf file.
convert *.jpg file.pdf
The files in the directory are numbered from 1.jpg
to 123.jpg
. The convertion went fine but after converting the pages were all mixed up. I wanted the pdf to have pages from 1.jpg
to 123.jpg
in the same order as they are named. I tried with the following command as well:
cd 1
FILES=$( find . -type f -name "*jpg" | cut -d/ -f 2)
mkdir temp && cd temp
for file in $FILES; do
BASE=$(echo $file | sed 's/.jpg//g');
convert ../$BASE.jpg $BASE.pdf;
done &&
pdftk *pdf cat output ../1.pdf &&
cd ..
rm -rf temp
But still no luck. Operating platform Linux.
Linux Solutions
Solution 1 - Linux
Or just read the ls
manual and see :
> -v natural sort of (version) numbers within text
So, doing what we need in single command.
convert `ls -v *.jpg` foobar.pdf
Have fun ;) F.
Solution 2 - Linux
The problem is because your shell is expanding the wildcard in a purely alphabetical order, and because the lengths of the numbers are different, the order will be incorrect:
$ echo *.jpg
1.jpg 10.jpg 100.jpg 101.jpg 102.jpg ...
The solution is to pad the filenames with zeros as required so they're the same length before running your convert command:
$ for i in *.jpg; do num=`expr match "$i" '\([0-9]\+\).*'`;
> padded=`printf "%03d" $num`; mv -v "$i" "${i/$num/$padded}"; done
Now the files will be matched by the wildcard in the correct order, ready for the convert command:
$ echo *.jpg
001.jpg 002.jpg 003.jpg 004.jpg 005.jpg 006.jpg 007.jpg 008.jpg ...
Solution 3 - Linux
You could use
convert '%d.jpg[1-132]' file.pdf
via https://www.imagemagick.org/script/command-line-processing.php:
> Another method of referring to other image files is by embedding a
> formatting character in the filename with a scene range. Consider the
> filename image-%d.jpg[1-5]
. The command
>
> magick image-%d.jpg[1-5]
causes ImageMagick to attempt to read images
> with these filenames:
>
> image-1.jpg image-2.jpg image-3.jpg image-4.jpg image-5.jpg
Solution 4 - Linux
All of the above answers failed for me, when I wanted to merge many high-resolution jpeg images (from a scanned book).
Imagemagick tried to load all files into RAM, I therefore used the following two-step approach:
find -iname "*.JPG" | xargs -I'{}' convert {} {}.pdf
pdfunite *.pdf merged_file.pdf
Note that with this approach, you can also use GNU parallel to speed up the conversion:
find -iname "*.JPG" | parallel -I'{}' convert {} {}.pdf
Solution 5 - Linux
This is how I do it:
First line convert all jpg files to pdf it is using convert command.
Second line is merging all pdf files to one single as pdf per page. This is using gs ((PostScript and PDF language interpreter and previewer))
for i in $(find . -maxdepth 1 -name "*.jpg" -print); do convert $i ${i//jpg/pdf}; done
gs -dNOPAUSE -sDEVICE=pdfwrite -sOUTPUTFILE=merged_file.pdf -dBATCH `find . -maxdepth 1 -name "*.pdf" -print"`
Solution 6 - Linux
Mixing first idea with their reply, I think this code maybe satisfactory
jpgs2pdf.sh
#!/bin/bash
cd $1
FILES=$( find . -type f -name "*jpg" | cut -d/ -f 2)
mkdir temp > /dev/null
cd temp
for file in $FILES; do
BASE=$(echo $file | sed 's/.jpg//g');
convert ../$BASE.jpg $BASE.pdf;
done &&
pdftk `ls -v *pdf` cat output ../`basename $1`.pdf
cd ..
rm -rf temp
Solution 7 - Linux
https://gitlab.mister-muffin.de/josch/img2pdf
In all of the proposed solutions involving ImageMagick, the JPEG data gets fully decoded and re-encoded. This results in generation loss, as well as performance "ten to hundred" times worse than img2pdf.
img2pdf is also available from many Linux distros, as well as via pip3.
Solution 8 - Linux
How to create A PDF document from a list of images
> Step 1: Install parallel
from Repository. This will speed up the process
> Step 2: Convert each jpg to pdf file
find -iname "*.JPG" | sort -V | parallel -I'{}' convert -compress jpeg -quality 25 {} {}.pdf
The sort -V
will sort the file names in natural order.
> Step 3: Merge all PDFs into one
pdfunite $(find -iname '*.pdf' | sort -V) output_document.pdf
Credit Gregor Sturm
Solution 9 - Linux
Combining Felix Defrance's and Delan Azabani's answer(from above):
convert `for file in $FILES; do echo $file; done` test_2.pdf