Gradle plugin to optimize png files and reduce resultant apk size within an Android project.
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Android Arsenal

Drawable Optimizer

Gradle plugin to optimize png files and reduce resultant apk size within an Android project.

How it works ?

With this plugin you will be able to optimize the png files size inside your AndroidStudio project. It works over the folder in which the resource merging was executed, by default in a Mac OSX system is app\build\intermediates\res\merged.

By doing this, all original png files are kept under /res folder and this optimization could be undone just cleaning the project.

In order to perform an optimization task, this plugin offers 2 different ways of file compression:

  • Pngtastic library, which brings its own compressor.
  • Zopfli, which offers ridiculously good compression ratios in exchange of low compression speed.

Why should I use this plugin ?

You can find an explanation from Colt McAnlis about why you should optimize your pngs Reducing PNG file Size and Smaller PNGs, and Android’s AAPT tool


Original Optimized
525.51k 473.20k
Original Image Optimized Image


Just click on Sync project with gradle files button

Download & Installation

In build.gradle

buildscript {
    repositories {
    dependencies {
        classpath 'org.fabiomsr:drawable-optimizer-gradle-plugin:1.0.4'

And in app\build.gradle

// Make sure this line comes *after* you apply the Android plugin (apply plugin: '')
apply plugin: 'org.fabiomsr.drawableoptimizer'


No configuration is needed by default, but if you want you can configure the following parameters. Every time the configuration changes the project must be cleaned.

In app\build.gradle

drawableOptimizer {
    optimizer = 'zopfli'
    compressionLevel = 9
    iterations = 15
    onlyOnRelease = true
    logLevel = 'info'
Parameter Description Values Default Value
optimizer Compressor to use zopfli or pngtastic zopfli
compressionLevel Compression level (useful for pngtastic compressor) 0-9 allowed Brute forces with every allowed value
iterations Compression iterations number (useful for zopfli) > 0 15
onlyOnRelease Only release signed optimization true or false false
logLevel Output Logging level none, debug, info or error info


Copyright 2016 Fabio Santana (fabiomsr)

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
See the License for the specific language governing permissions and
limitations under the License.