Mobile apps are vulnerable to a variety of security risks today, prompting developers to implement security best practices to combat assaults. ProGuard is an open-source command-line utility that is strongly recommended for Android apps. Less than half of the financial applications on the Android Store have adequate security safeguards. As a result, applications are exposed to a range of dangers such as IP theft, app duplication, sensitive data loss, and reputational harm, to name a few. Another key element to consider is app performance. Removing unneeded codes and parts from applications might result in smaller, quicker apps. Obfuscation of code is crucial for open-source programs. The benefits of using ProGuard are immense some of which are listed below.

What exactly is ProGuard?

It is a free program for shrinking, optimizing, obfuscating, and verifying Java class files. ProGuard is essential for reducing app size and optimizing apps. ProGuard is utilized in both Android apps and big Java apps and libraries. Reverse engineering is complex but not impossible to implement. It should be noted that ProGuard is a basic security solution and should not be seen as a complete and multi-layered security strategy. A notable feature of this command-line utility is that it safely eliminates unnecessary variables and minimizes program size.

Proguard’s Functions:

ProGuard’s primary functions are shrinking, optimization, and obfuscation.

  • Shrinking: Shrinking is the process of shrinking APKs. ProGuard detects unneeded parameters, procedures, and classes. Unused code is eliminated from the program as well as the libraries. The process of shrinking includes:
  1. Code reduction entails eliminating unneeded variables, methods, classes, and properties from the program and its library dependencies. Relates to code reduction
  2. Resource shrinking is the removal of unnecessary resource files from the program and its library dependencies.
  • Optimization: The term optimization refers to the process of optimizing the bytecode. Unused instructions might have a detrimental impact on app performance. Through peephole optimization approaches, redundant instructions in a tiny part of the resulting code are removed. At this step, duplicate code is deleted, and instructions that may be substituted with shorter commands are detected and removed.
  • Obfuscation: Obfuscation is the practice of rendering code unreadable. This unreadability will lead restrict the hackers to acquire the program illegally. After the useless codes are removed, the leftover classes, fields, and procedures are renamed with random characters. Obfuscation is used to keep hackers from discovering the original purpose of code portions.
  • Pre-verification: Pre-verification is the process of introducing pre-verification information into class files for specific Java variants (Java 6 or Java Micro Edition) to maximize the benefit of quicker class loading. This pre-verification plays a pivotal role in preventing cybercrime. ProGuard is a command-line utility that may be used to compress, optimize, and conceal Java code. It eliminates unnecessary instructions, making programs smaller, quicker, and more resistant to reverse engineering.

ProGuard Advantages:

  • Simple to set up: In comparison to other Java obfuscators, ProGuard provides a template-based setup. It’s one of ProGuard’s most significant benefits. The template-based setup enables you to just enter your data into the layouts and the program will operate on its own; you will not need to make any more attempts to run the application. To enable ProGuard, use a few basic command-line parameters or a simple configuration file. As a result, ProGuard is a very user-friendly and straightforward program to use.
  • App for Static Analysis: Understanding the static analysis of any program is critical for hackers and cybercriminals alike. If they have access to the static analysis, they can determine which card was used in the program. Static analysis is utilized to determine the setup as well as to comprehend the restrictions and notches of the program. Maintaining the static analysis of any program safe is done by ProGuard, which shields the static analysis and makes it challenging for hackers to disassemble or decode.
  • Size reduction: Using ProGuard can result in smaller-size files. ProGuard can reach a size reduction from 20% to 90%. Another important benefit of ProGuard is that it is multitasking. It processes multiple megabytes within a few seconds. It also provide an optional graphical interface for Ant and JME Wireless Toolkit. This fast work leads to an increase in the efficiency of the program. Size reduction helps in making the system work faster with much more accuracy and less memory imprint.
  • Efficiency: ProGuard boosts application efficiency and optimizes usefulness. By deleting all of the application’s superfluous parts, deficiencies were amplified. As a result, the software is decongested, allowing it to focus on only the elements that are useful to the consumer. This not only minimizes its size but also makes it more cost-effective and cheap for both the producer and the manufacturer. This also minimizes the global carbon footprint and provides a simple, sustainable way to use technology. Because of the decongestion, the programs can run more quickly.
  • Calculator for dead codes: Dead codes should always be deleted as they decongest the program and aid in its efficient and quick operation. ProGuard recognizes these date codes. Dead codes are quotations that are no longer in use but remain in the software. ProGuard not only recognizes this code but also removes it from the source code to decongest the application.

Other advantages:

ProGuard guidelines assist in determining which codes must be separated. This allows for more focused and efficient program operation and aids in the obfuscation, optimization, and downsizing processes. ProGuard is quite effective at debugging. This prevents ProGuard from being enabled for Debug builds. With ProGuard for Debug builds, debugging will become incredibly complicated.


Most developers use ProGuard for its obfuscation capabilities, however, the benefits of ProGuard go beyond security. ProGuard android can significantly minimize app size. It removes obsolete codes and deletes classes and their constituents to random characters. The reduction in size makes the program more efficient. It eliminates useless codes as well as services that are no more accessed. ProGuard does not necessitate any extra dependencies. It can simplify identifiers, combine classes and inline methods, and remove extraneous arguments. ProGuard removes logging code keeping the original code unaffected.