#resize png or jpg to either height or width, keeps proportions using imagemagick It will overwrite your original images so make sure you have a backup before running this!įOLDER="/var/www//wp-content/uploads" WIDTH is the max width and HEIGHT is the max height. Paste the script below, remember to change the FOLDER variable!įOLDER is the absolute path to your image folder Now we can move on to batch resizing Batch Resize Images with Linux with ImagemagickĬreate the following script mkdir -p ~/scripts Note that this overwrites your original image! convert image.jpg -resize 600x400\> image.jpgĬheck the image was resized identify -format "%wx%h" image.jpg This will automatically preserve the aspect ratio of the image too. You can resize the image if it is larger than the specified dimensions. You will see the resolution, width is first then height. We can use the identify command to get the width ( %w) and height ( %h) identify -format "%wx%h" image.jpg Batch Resize Images using Linux Command Line and Imagemagickįirst we need to install Imagemagick from the repository on Debian or Ubuntu sudo apt-get update
If you want to install Imagemagick on CentOS see this guide.
#Linux command line convert image format how to#
This guide shows you how to batch resize jpg and png files using Imagemagick on Ubuntu or Debian. If you never had any image size restrictions or automatic resizing on your site, it can be extremely convenient to batch resize those images in Linux. The most common culprit is image size or lack of compression. Large images means a large page size which means slow WordPress page load times for users.
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