JKS File

What are JKS files and how to open them

Are you having problems opening a JKS file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your JKS files.

What is a JKS file?

A .JKS file is a Java KeyStore file.

Java KeyStore (JKS) files are secure containers used by Java platforms to store cryptographic keys and certificates. These files hold private keys (password-protected) and their associated public-key certificates, as well as trusted certificates belonging to external parties. Java tools like the built-in keytool or applications that secure connections using SSL/TLS rely on JKS files to manage identity and trust settings.

These files are created and managed by Java itself - usually via keytool commands or Java APIs through classes such as java.security.KeyStore. When a JKS file is written, the entire keystore's integrity is protected by a password, and each private key inside can also be separately password‐protected. Besides creating new entries, typical operations include listing, exporting, importing, and deleting certificates.

JKS is a proprietary, Java-specific format introduced in Java 1.2 and maintained by Oracle. Since Java 9 (released September 21, 2017) the default keystore format has shifted to the standard PKCS#12 format, though existing JKS files remain supported and tools can still explicitly specify use of JKS when needed.

In terms of structure, JKS keystore files begin with a 32-bit magic number FEEDFEED (hex) at offset zero. This "magic" value helps software detect that the file is using the JKS format.

How to open JKS files

We have identified one JKS opener that is compatible with this specific type of JKS file.

Programs that open Java KeyStore files

Last updated: August 7, 2026

Various apps that use files with this extension

These apps are known to open certain types of JKS files. Remember, different programs may use JKS files for different purposes, so you may need to try out a few of them to be able to open your specific file.

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