How to View MANIFEST.MF in a JAR File

Find and inspect the MANIFEST.MF file inside Java JAR archives on Android.

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What is MANIFEST.MF?

MANIFEST.MF is a metadata file commonly stored inside META-INF/ in a JAR archive. It can include useful information such as Main-Class, Manifest-Version, and Created-By.

Why Main-Class Matters

If a JAR file is meant to run as an application, it often needs a Main-Class entry. This tells a Java runtime which class should start first.

Manifest-Version: 1.0
Created-By: Java
Main-Class: com.example.Main

Steps to View MANIFEST.MF

  1. Open Jar File Opener.
  2. Select your .jar file.
  3. Browse to the META-INF folder.
  4. Tap MANIFEST.MF.
  5. Read the manifest information directly in the app.

Useful Manifest Fields

FieldMeaning
Main-ClassThe startup class for runnable JAR files.
Manifest-VersionThe manifest file version.
Created-ByTool or Java version used to create the archive.
Class-PathExternal libraries or classpath entries.

Want to Run the JAR?

After checking Main-Class, you can try running compatible Java JAR files with Jre4Android.

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Download Jar File Opener

View MANIFEST.MF and inspect JAR metadata on Android.

Download on Google Play