Java

Free online java tools for reverse, unpack, and deobfuscate code and files. Choose from Bytecode Viewer, Obfuscation Detector and Java Deobfuscator and 2 more. All 5 run in your browser — nothing is uploaded.

Java

5 tools

Java Constant Pool Analyzer

Extract all constants from Java .class files: strings, class references, method signatures, field references, numeric constants, and type descriptors. Filter by category, search across entries, and explore the complete constant pool table with raw hex data. All browser-local, no signup required.

Java Obfuscation Technique Detector

Scan Java code for obfuscation signatures. Detects ProGuard, DashO, Zelix KlassMaster, Allatori, and yGuard obfuscation techniques with confidence scoring. Paste decompiled Java source to identify which obfuscator was used. All browser-local, no signup required.

Java Bytecode Viewer

View Java bytecode instructions, constant pool entries, stack frames, and line number tables online free. Upload a .class file or paste hex bytecode to disassemble and inspect JVM instructions, mnemonics, constant pool details, method attributes, and stack map frames. All browser-local, no signup required.

Java Obfuscated Stack Trace Deobfuscator

Deobfuscate Java stack traces using a ProGuard mapping.txt file online free. Paste an obfuscated stack trace and mapping file to restore original class and method names from obfuscated crash reports. Handles a.a() and b.b.a() naming patterns. All browser-local, no signup required.

Java Deobfuscator & Decompiler Helper

Free Java deobfuscator online. Detect and decode Unicode escapes, hex strings, obfuscated numbers, Base64, and char array concatenation in Java source code. Paste Java code and instantly reveal hidden strings and numeric values. All browser-local, no signup required.