x64dbg/x64dbg is an open-source binary debugger for Windows that operates against ordinary applications at the user mode level. It was built for reverse engineering and malware analysis, and the latest published release is 2026.05.27. The changes in 2026.05.27 could not be confirmed, so what actually changed in this version has to be checked directly in the release notes on the GitHub repository.
The tool looks directly at the behavior and assembly of executables that have no source code. You step through the commands an executable performs to shed light on how a program behaves, and that is how malware behavior gets analyzed. On top of the built-in features, a comprehensive plugin system lets users add their own extensions. 32-bit executables are debugged with x32\x32dbg.exe and 64-bit executables with x64\x64dbg.exe, while x96dbg.exe lets you choose the architecture yourself. The implementation language is C++, and the repository was created on 2015-04-11 and has collected 49976 stars.
Analysis is limited to user mode applications, and the license is left as NOASSERTION, so the terms of use are hard to confirm from the published information alone. The breadth of features and the user base are clear, but the fact that the terms of use are still not spelled out remains. Whether to adopt it in practice is better decided after checking the repository documentation and the license file.