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Resource resizer for Android and iOS

Project Description


Res Resizer is a script that allows you to automatically process resource files for both Android and iOS projects.

For both iOS and Android you can process an individual file or an entire folder. There are subtle differences between the way the script handles resources for different projects.

The script will process PNG and JPG files. It ignores NinePatch files.


If you point the script at a folder, the script will process only images that contain the @2x modifier in the file name. All other image files remain untouched. This prevents us from shrinking specific files for the 4” retina screen. The files are outputted in the same directory with the @2x omitted from the new file name. Keep in mind this overwrites any existing file with that file name.


For 0.4.0 I have eliminated outputting images for the ldpi density. The Android documentation no longer lists this as a requirement.

Point the script at your xxhdpi drawables folder and the script will process either an individual file, or the entire folder, and output your xhdpi, hdpi, and mdpi resources in their respective folders. If these folders don’t exist the script will create them for you.

Android Example

Point the script at “res/drawables-xxhdpi”, which the script assumes contains your xxhdpi images. Should your folder for the lower quality images not exist, the script will create the folders for you. You will end up with:

  • res/drawables-xxhdpi/
  • res/drawables-xhdpi/
  • res/drawables-hdpi/
  • res/drawables-mdpi/


$ chmod +x Makes the script runnable.

Hint: all output can be silenced by adding the --silence option.


$./ -i --folder ~/MyProject/project/images/ resize all images in the images folder of your project.

$ ./ -i --file ~/MyProject/project/images/my_image.png resize only one specific image.


$./ -a --folder ~/MyProject/res/drawables-xxhdpi resize all found images in xxhdpi folder. Script will output in Android style.

$ ./ -a --file ~/MyProjects/res/drawables-xxhdpi/my_image.png resize specific image only.

$ ./ -a --prod automatically find xxhdpi folder and execute as with –folder option. Note: –prod does not work with iOS flag.

$ ./ --exclude-scale [mdpi|hdpi|xhdpi] do not scale down to this density. Exclude multiple at once: --exclude-scale ldpi mdpi.

Feedback & Improvements

Please, let me know what can be improved. Fork it!

Release History

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Source Sep 11, 2013

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