What Is classes.dex? Reading an Android DEX Inventory
classes.dex contains compiled code for Android's runtime. An APK can include several DEX files, and their class inventory includes application code,.
Decompile & reverse engineering
DEX / Smali Analyzer
Choose apktool for APK smali/resources or jadx for Java recovery. View class/method counts where available; select Download ZIP or Both for files. Raw .dex/.jar inputs use jadx.
DEX / Smali Analyzer is part of APKLint, an online toolkit for inspecting Android APK files. Choose apktool for APK smali/resources or jadx for Java recovery. View class/method counts where available; select Download ZIP or Both for files. Raw .dex/.jar inputs use jadx. Upload an APK in your browser to view the relevant details; results reflect what the file itself exposes.
Drop your file here
or click to choose from your device
Accepts: .APK, .DEX, .JAR · up to 1 GB
Deleted after your scan. Files you upload are processed on our servers over an encrypted connection, then removed by the next hourly cleanup after analysis finishes (long scans are protected while they run). We never share them, and need no account.
About DEX / Smali Analyzer
Choose apktool for APK smali/resources or jadx for Java recovery. View class/method counts where available; select Download ZIP or Both for files. Raw .dex/.jar inputs use jadx.
DEX / Smali Analyzer is part of APKLint’s decompile & reverse engineering toolkit — Turn a built app back into readable code and resources. It’s free to use and needs no account.
Your privacy is the default: files you upload are processed on our servers over an encrypted connection and permanently deleted by a scheduled hourly cleanup after analysis finishes, and never shared.
What DEX / Smali Analyzer checks
- For an .apk: decodes to smali and resources with apktool
- For a raw .dex or .jar: analyzes with jadx (apktool is APK-only)
- Reports per-DEX class and method counts when DEX bytecode is present (APK, raw .dex, or a .jar that bundles .dex)
- Provides a ZIP when Download ZIP or Both is selected
Good to know: Accepts .apk, .dex, or .jar — not .aab. apktool smali output applies to .apk inputs; raw .dex/.jar are handled by jadx.
When to use DEX / Smali Analyzer
- Best for
- Working directly with bytecode containers: an .apk decoded to smali, or a raw .dex/.jar inspected on its own, with class and method counts.
- Not the right tool for
- Not for .aab inputs. Readability of recovered Java depends on the bytecode and obfuscation; original source is not guaranteed.
- What you get back
- For APK input, apktool can produce smali/resources; jadx produces Java-source recovery. Raw .dex/.jar always uses jadx. DEX class/method counts are reported where bytecode is available; choose a download output mode for a ZIP.
- How it differs from related APKLint tools
- It is the only tool here that accepts raw .dex and .jar, not just APKs; apktool centers on resources, the Decompiler on Java source.
- Limitations
- Output depends on the selected engine. Recovered Java is an approximation, raw .dex/.jar does not produce an apktool smali tree, and .aab is not accepted.
How to use DEX / Smali Analyzer
- Choose your file — Drop a .APK, .DEX, .JAR file onto the page, or click to select it from your device.
- Send securely — The file is uploaded over an encrypted connection to our analysis servers.
- Read your report — APKLint unpacks and inspects the package and lays out the results on screen.
- Your file is removed — It's deleted by an hourly cleanup job after analysis finishes.
Why use APKLint
Always free
Every tool is free with no login and no paywall. Reasonable file and input limits keep the free service stable.
No on-page ad banners
A clean, focused interface with no third-party ad banners cluttering your results.
Privacy-first
Files you upload are deleted by a scheduled hourly cleanup after analysis finishes, and never shared.
Open-source engines
Built on jadx and apktool for decompiling and disassembly.
No sign-up
Start immediately — no account, login, or email required.
Works anywhere
Runs in any modern browser, on desktop or mobile.
Frequently asked questions
What does DEX / Smali Analyzer do?
Choose apktool for APK smali/resources or jadx for Java recovery. View class/method counts where available; select Download ZIP or Both for files. Raw .dex/.jar inputs use jadx.
What is smali?
Smali is the human-readable assembly form of Dalvik bytecode. It's lower-level than Java but shows exactly what the compiled code does.
Is it free to use?
Yes. Every tool on APKLint is completely free, with no sign-up and no account.
How is my data handled?
Your uploaded file and its result are processed on our servers over an encrypted connection, then removed by the next hourly cleanup after analysis finishes. We never share them.
What files can I send?
A full APK, or a raw .dex, .jar — .APK, .DEX, .JAR — up to 1 GB.
Related tools
All product names, logos, and trademarks are property of their respective owners. APKLint is an independent toolset and is not affiliated with, endorsed by, or sponsored by Google, Android, or any other party.