Upload any certificate file and know when it expires, who issued it, what it's authorised for — and whether it's still cryptographically strong.
or browse to select one or more files
100% private — nothing is uploaded to any server
Your certificate files never leave your device. All parsing happens locally using node-forge — a production crypto library trusted by thousands of projects.
Shows exactly what your DSC is authorised for — digital signing, encryption, code signing, email — and flags Class 3 certificates used for legal filings.
SHA-1 signed certificates are flagged as cryptographically weak. Modern government portals require SHA-256 — know before you try to file.
Drop multiple certificates at once. Get a summary dashboard showing valid, expiring, and expired counts — ideal for teams managing many DSCs.
Export your full certificate report as a CSV for spreadsheet analysis, or a print-ready PDF for record-keeping and audit trails.
Click any field — serial number, subject, issuer — to copy it. Useful when filing renewal requests or verifying identity with a Certifying Authority.