Developers and security professionals often use deobfuscators to analyze potentially malicious code, debug script issues, or understand obfuscated code when the source is unavailable.
Using a deobfuscator is legal for analyzing or debugging your code or for educational purposes. However, deobfuscating code without permission can infringe on copyright laws or violate terms of service agreements.
While many deobfuscators can handle standard obfuscation techniques, some advanced methods can make deobfuscation extremely difficult or practically impossible. The success of deobfuscation depends on the tools used and the obfuscation level.
Deobfuscating code you do not own or have permission to analyze can lead to legal issues. Additionally, deobfuscating malicious code poses a security risk and should be done in a controlled, secure environment to prevent accidental execution.