JKS Viewer Online

This online tool accepts a keystore file in JKS, JCEKS, or PKCS12 formats and an optional keystore password. It parses the store contents and returns a detailed catalog of entries, including aliases, certificate data, and key entries. For each certificate, the tool exposes subject, issuer, validity period, serial number, algorithm, and key size, along with a SHA-256 fingerprint. The output can be viewed in a structured data view or a compact human-readable summary and can be exported as PEM or DER certificates.
Under the hood, the tool uses standard cryptographic parsing methods to read keystore entries, resolve trust chain information where available, and validate certificate expiry against the current date. If the password is incorrect, the tool reports an auth error; if the format is unsupported, it reports a mismatch. Export options generate PEM/DER copies without exposing private keys.
Who benefits includes Java developers, security engineers, and DevOps teams responsible for certificate management in Java apps. It is particularly useful for audits, CI pipelines, and incident response where quick visibility into keystore contents is required.
Unique value includes multi-format support (JKS, JCEKS, PKCS12), comprehensive per-entry details, expiry-aware alerts, and straightforward export options. It enables automated checks, reduces manual inspection time, and works entirely online without client-side software.