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What is Bytor?

Bytor protects your C# code on Unity3D against cracking, illegal modification of your code, disassembling and decompiling.


How does it work?

Bytor modifies bytecode of your game the way it can't be decompiled. You can try it yourself, list of decompilers is here. If you are interested in details of how Bytor works, what files are modified and how, these information are part of our commercial support.


Ok, so how do I use it?

Just get the trial license, upload your .apk file generated by Unity3D, download your protected file, then sign it again and… release to the wild. If you have any questions, contact us at , however we can't guarantee to respond to everyone.


Why commercial support?

You get newest version of Bytor with all sorts of improvements compared to free version, information how Bytor works and what files are modified, mail support with guaranteed response. If you are interested, contact us at .

Frequently Asked Questions

Who are you?


We are Barebit, a registered company based in EU, Czech Republic.


I doubt if it is safe to upload my APK.


First of all, we are not interested in your APK. It is removed from our servers shortly after you downloaded your protected APK.
To make sure we won't publish your APK on your behalf we strongly recommend you to remove the <apk>/META-INF directory before it is uploaded. The APK file is actually a ZIP file. Just unpack it, remove the directory and pack it again.


Where can I download Bytor?


The protector can't be released as a client application because it would be soon exploited by malware to hide itself from anti-virus scanners. You can use Bytor only through its web interface.


I doubt if the Bytor protection is stable enough.


Bytor has been well tested in the wild because it already has hunders of thousands instalations. For obvious reasons, we can't disclose what games are protected with Bytor.


How much FPS will my game loose because of the protection?


The protection doesn't slow down your code at all. You won't loose any FPS.


Is Bytor just another .NET obfuscator?


It is much more than an obfuscator. It uses previously unseen approach to protect code running on Mono. Get the trial license and try it yourself.


Is the protection unbreakable?


Nothing is unbreakable. However, Bytor provides real protection that takes huge effort to be circumvented.


I don't need protection, IL2CPP is coming to protect my code.


Sad to say, IL2CPP doesn't work like a code protection. Your compiled .NET bytecode can be decompiled easily because of .NET metadata. These metadata are generated by IL2CPP as well. This means IL2CPP adds only a small barrier. Your code can be decompiled to C-language code that is not hard to read. The game modding community is strong and always find ways to break your code, unfortunately.


Does Bytor work with IL2CPP?


Bytor works only with Mono runtime. We don't recommend IL2CPP without protecting the generated code that can be easily cracked as well.


Do you support my Unity3D version?


Bytor supports versions 4.6, 5.0, 5.1, 5.2 and 5.3.


How do I sign the protected APK?


You need to sign the protected APK again because Bytor (or you) had to remove your certificates (the META-INF directory) from the APK. The signing provides jarsigner from Java Development Kit (JDK). If you are not sure about your JDK location, check the JAVA_HOME environment variable that is usually set to the JDK installation path.

Use the following command:

jarsigner -storepass <your password> -sigalg SHA1withRSA -digestalg SHA1 -keystore <your keystore file> <apk file> <alias name>
  • storepass: password that protects your keystore
  • sigalg and digestalg: these values are recommended by Google
  • keystore: the file with your keys; by convention, Android Java keystore has "keystore" extension
  • alias: name of the key stored in the keystore

Check if the APK is signed:

jarsigner -verify -verbose -certs -keystore <your keystore file> <apk file>
Detailed help is available in Oracle Documentation. Learn more in Android documentation.

The last step is alignign your APK with zipalign. It is a part of Android SDK, located in <sdk>/build-tools directory. Use the following command:

zipalign -v 4 <signed apk file> <output apk file>
  • v: verbose output
  • 4: alignment in bytes; this value is recommend by Google

Check if the APK is aligned:

zipalign -c -v 4 <aligned apk file>
Learn more about zipalign in Android documentation.