Java Decompiler Online

🔍 Java Decompiler Online

Convert compiled .class and .jar files back to readable Java source code instantly

✓ 100% Free ✓ .class & .jar Support ✓ Supports Java 8-25 ✓ Secure Processing

Decompiled Java Source Code

📁 Decompiled JAR Contents

Select a file to view

👈 Select a .java file from the tree to view its contents

About Java Decompiler

A Java decompiler is a specialized tool that reconstructs Java source code from compiled bytecode (.class files). This online decompiler uses CFR (Class File Reader), one of the most advanced Java decompilers, to reverse-engineer bytecode into human-readable Java source code.

Supported File Types

.CLASS files: Single compiled Java class files. The decompiled source is shown directly with syntax highlighting.

.JAR files: Java Archive files containing multiple classes. Browse all decompiled files in a tree view and download as ZIP.

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Code Analysis

Examine third-party libraries, understand dependencies, and analyze compiled code structure without access to original sources.

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Debugging

Debug production issues by decompiling and examining the exact code that's running, even without source code access.

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Learning

Study how Java constructs are compiled, understand bytecode patterns, and learn from well-designed libraries.

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Security

Files are processed securely and deleted immediately after decompilation. No data is stored or retained on our servers.

Encoding and Data Utilities

Encode, decode, measure sizes, and transform common formats.

Hex Encoder/Decoder Convert text to and from hexadecimal HTML Encoder Escape markup safely HTML Decoder Unescape HTML entities GZIP Compressor Compress text using GZIP algorithm GZIP Decompressor Decompress GZIP encoded data Text to Deflate Compress text using Deflate algorithm Deflate to Text Decompress Deflate data to plaintext Java Escape Escape text for Java string literals Java Unescape Convert escaped Java text to plain text SHA384 Hash Generate SHA-384 hash from text SHA384 File Hash Generate SHA-384 hash from file SHA512 Hash Generate SHA-512 hash from text SHA512 File Hash Generate SHA-512 hash from file SHA512/224 Hash Generate SHA-512/224 hash from text SHA512/224 File Hash Generate SHA-512/224 hash from file SHA512/256 Hash Generate SHA-512/256 hash from text SHA512/256 File Hash Generate SHA-512/256 hash from file SHA1 Hash Generate SHA-1 hash from text SHA1 File Hash Generate SHA-1 hash from file SHA224 Hash Generate SHA-224 hash from text SHA224 File Hash Generate SHA-224 hash from file SHA256 Hash Generate SHA-256 hash from text SHA256 File Hash Generate SHA-256 hash from file Double SHA256 Hash SHA256(SHA256(x)) - Bitcoin hash SHA3-224 Hash Generate SHA3-224 Keccak hash SHA3-224 File Hash Generate SHA3-224 hash from file SHA3-256 Hash Generate SHA3-256 Keccak hash SHA3-256 File Hash Generate SHA3-256 hash from file SHA3-384 Hash Generate SHA3-384 Keccak hash SHA3-384 File Hash Generate SHA3-384 hash from file SHA3-512 Hash Generate SHA3-512 Keccak hash SHA3-512 File Hash Generate SHA3-512 hash from file Keccak-224 Hash Original Keccak-224 hash algorithm Keccak-224 File Hash Generate Keccak-224 hash from file Keccak-256 Hash Original Keccak-256 (Ethereum hash) Keccak-256 File Hash Generate Keccak-256 hash from file Keccak-384 Hash Original Keccak-384 hash algorithm Keccak-384 File Hash Generate Keccak-384 hash from file Keccak-512 Hash Original Keccak-512 hash algorithm Keccak-512 File Hash Generate Keccak-512 hash from file RIPEMD-128 Hash Generate RIPEMD-128 hash from text RIPEMD-128 File Hash Generate RIPEMD-128 hash from file RIPEMD-160 Hash Generate RIPEMD-160 hash from text RIPEMD-160 File Hash Generate RIPEMD-160 hash from file RIPEMD-256 Hash Generate RIPEMD-256 hash from text RIPEMD-256 File Hash Generate RIPEMD-256 hash from file RIPEMD-320 Hash Generate RIPEMD-320 hash from text RIPEMD-320 File Hash Generate RIPEMD-320 hash from file Grok Pattern Builder Author and debug Logstash grok rules JSONPath Evaluator Test JSONPath expressions and normalized paths XML <-> JSON Two-way XML and JSON conversion JSON to GeoJSON Convert JSON to GeoJSON geographic format JSON to GraphQL Generate GraphQL schema from JSON data Java Decompiler View Java classes on the fly APK Decompiler Decompile Android APK files to Java AAB Decompiler Decompile Android App Bundle files AAB to APK Converter Convert Android App Bundle to APK JAR Vulnerability Scanner Scan JAR files for CVEs APK Vulnerability Scanner Scan Android APKs for CVEs JSON -> Java POJO Generate getters/setters from JSON Text Size (Bytes) Measure string length with/without spaces JSON Size (Bytes) Check JSON payload footprint XML Size (Bytes) Measure XML size quickly UTF-8 Encoder/Decoder Round-trip text and UTF-8 bytes JSON -> NDJSON Convert collections to newline-delimited JSON Cron Generator Craft and copy cron expressions JSON -> YAML Convert JSON documents to YAML YAML -> JSON Transform YAML into JSON YAML -> POJO Generate Java models from YAML Regex Generator Compose regex patterns visually Regex Tester Debug expressions against sample text XML -> POJO Convert XML into Java classes Bash -> Batch Translate shell scripts to Windows .bat JSON -> TypeScript Generate TS interfaces from JSON

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