What is the difference between JAR, WAR and EAR?

JAR (Java Archive) packages general Java classes and resources. WAR (Web Application Archive) is for web apps with servlets and JSPs. EAR (Enterprise Archive) bundles multiple modules including WARs and EJBs. All use the same ZIP-based container format.

Are my JAR files uploaded?

No. Files you open from your device stay on your device and are read locally. Only the public sample archive is requested from the server.

Can it decompile .class files?

No, this viewer lists the archive contents (class names, manifest, resources) for inspection. It does not decompile or execute Java bytecode.

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JAR Viewer

Free online JAR viewer. Open Java archives (.jar, .war, .ear) in your browser to list contents — no upload, no extraction.

.jar.war.ear

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Tool usage guide

About this file format

JAR (.jar, Java Archive), introduced by Sun Microsystems in 1995, aggregates compiled Java class files, resources and metadata (manifest) into a single ZIP-based archive. WAR (.war) and EAR (.ear) extend this pattern for web applications and enterprise modules. The manifest (META-INF/MANIFEST.MF) describes the package, its main class and dependencies, making JAR the fundamental distribution unit of the Java ecosystem.

JAR Viewer

About this file format

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