I want to convert a batch of images, nearly 100, from jpg to png format. How can I do this without renaming them, but instead actually converting the format?

  • Use the convert command. No, really. But you will want to rename them from something.jpg to something.png.
    – Jos
    Commented Apr 29, 2014 at 10:59
  • 1
    @jos, From your comment I don't understand that what should I do!!
    – opu 웃
    Commented Apr 29, 2014 at 11:03
  • I wasn't finished editing ;-) First, use the convert command on a single .jpg file and see if it works. Then, write a script that loops over the .jpg files and converts them to .png files.
    – Jos
    Commented Apr 29, 2014 at 11:05
  • You not mentioned how can I use the convert command on a single .jpg file. And I don't know how to write a script that loops over the .jpg files.
    – opu 웃
    Commented Apr 29, 2014 at 11:13

4 Answers 4


Try these commands,

mogrify -format png /path/*.jpg    

This will convert all the .jpg files into .png files and saves the converted files in the same directory.

mv /path/*.png ~/Desktop/pic

This will moves all the .png files(converted) to the pic directory which resides on the Desktop.


If you want to keep the orientation of your image you have to add -auto-orient to the command. You can find out why here. The mogrify command which keeps the orientation would look like this:

mogrify -auto-orient -format png /path/*.jpg    
  • Should I change the directory?
    – opu 웃
    Commented Apr 29, 2014 at 11:14
  • 1
    /path/*.jpg represents the directory where the .jpg files are stored. Commented Apr 29, 2014 at 11:30
  • I also tried this command after changing the directory: mogrify -format png .jpg This also works nicely.
    – opu 웃
    Commented Apr 29, 2014 at 13:38
  • The answer below is better, as it takes into account the limits placed on ARGV. Commented May 16, 2017 at 2:57
  • 1
    is mogrify command lossless?
    – Mona Jalal
    Commented Nov 13, 2019 at 16:39

Using ImageMagick.

First install imagemagick:

sudo apt-get install imagemagick

Try converting just one image at first:

convert image.jpg image.png

Now convert all:

mogrify -format png *.jpg


You also need to split it into chunks that will fit to avoid hitting the limit of how much you can put on a command line. This should work better:

find -name '*.jpg' -print0 | xargs -0 -r mogrify -format png

The -print0 and -0 are used to handle spaces in filenames and the -r means don't run mogrify if there's nothing to do.

Source: https://stackoverflow.com/questions/1010261/running-a-batch-with-imagemagick

EDIT 2 Switched png and jpg as per @Glutanimate's comment.

EDIT 3 Changed png to jpg in last suggestion.

  • One image converted successfully. But when I used command to convert all its showing mogrify.im6: unable to open image ``*.png': No such file or directory @ error/blob.c/OpenBlob/2638.``mogrify.im6: unable to open file ``*.png' @ error/png.c/ReadPNGImage/3667.
    – opu 웃
    Commented Apr 29, 2014 at 11:32
  • You will have to cd to that directory first. If they are in the desktop, run cd ~/Desktop first then try converting again.
    – Parto
    Commented Apr 29, 2014 at 11:34
  • I changed the directory
    – opu 웃
    Commented Apr 29, 2014 at 11:35
  • @Parto I think it should be mogrify -format png *.jpg. The OP is asking about converting jpg → png. Commented Apr 29, 2014 at 13:01
  • did not work for me with 14.04 @Parto
    – talha06
    Commented Jun 18, 2016 at 14:48

Firstly, convert works. You don't need to test it. Secondly, a bash oneliner suits the need:

$ for file in Ground*jpg; do { \
  echo "Converting $file to `echo $file|cut -d. -f1`.png" ;\
  convert $file `echo $file|cut -d. -f1`.png ; } done

Rockin' it auldskewl ;)



I know it's been a long time since this question was put but there is one brilliant piece of software that has not been mentioned that I have used a lot.

http://photobatch.wikidot.com/ also known as Phatch. It literally converts anything from anything to anything else in image terms. It had not been updated for a while but now claims to be released for ubuntu 17.10. Give it a try. I'm confident you'll be very happy with it.

  • 2
    Tried to get this software, the "download" link to the deb file is missing from the above link, and the Ubuntu "store" version gave me this error: Detailed errors from the package manager follow: apt transaction returned result exit-failed Ubuntu v 18.10 maybe? Anyway - my experience. Commented Jul 17, 2018 at 2:54

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