What is a .JKS file?
JKS is a Java KeyStore holding keys and certificates for Java apps.
- Did you know
- JKS was Java’s default keystore until the cross-platform PKCS#12 took over in Java 9.
- JKS protects each private key with a home-grown cipher built from SHA-1 and the password rather than a recognised encryption standard.
- Unlike its JCEKS relative, JKS can only hold asymmetric private keys and certificates, never symmetric secret keys.
- What Analyser reads
- Inspect security and crypto files: PEM private/public keys (RSA/EC/Ed25519, PKCS#1 vs PKCS#8, encryption), OpenSSH .pub with SHA-256 fingerprint, PuTTY .ppk, PKCS#10 CSR, X.509 CRL, PKCS#7 bundles, OpenVPN/WireGuard configs, Java KeyStores, Apple .mobileconfig/.mobileprovision, Windows .reg (with autorun flagging), and pcap/pcapng captures - warning when a private key or secret is present.
- Depth of analysis
- .JKS is an identification-grade format: Analyser recognises it from its bytes and decodes the header metadata it carries, rather than opening it in a full viewer. Formats that do get a full viewer are marked "Full" on the formats page.
- Open a .JKS file
- Drag a .JKS file onto the Analyser home page (or tap to pick one). It is identified entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.