No tool claiming to be an is perfect:

Remember that with great power comes great responsibility. Use these tools legally, ethically, and for legitimate purposes such as education, security research, or recovering your own code. The world of reverse engineering is fascinating and challenging—these free and portable tools are your entry ticket.

This comprehensive guide covers everything you need to know about decompiling EXE files online, how these tools work, and the best portable alternatives for your toolkit. What is an EXE Decompiler?

.NET (C#, VB.NET), Java, Android APKs, and Python EXEs.

First, let's set expectations. An does not magically reproduce your original C++, C#, or VB6 source code exactly as you wrote it. Compilation is a lossy process. What decompilers actually do is: