Certificate Info Viewer
Parse SSL/TLS certificates via paste, upload or domain query with subject, issuer, validity and fingerprints
This tool requires uploading data to the server: pasted/uploaded certificate content will be uploaded for parsing, and domain queries will establish SSL connections through the server to fetch certificates. All data is used only for this request and not stored.
Input type
Documentation
Overview
Certificate Info Viewer parses SSL/TLS certificates and shows subject, issuer, validity, public key and fingerprint details.
Key Features
- Parse PEM content or upload certificate files
- Query a domain to fetch its SSL/TLS certificate
- Display subject, issuer, validity, public key, fingerprints and SANs
- Download certificate and public key files
How to Use
1
Choose an input method: paste, upload, or domain
2
Provide certificate content or a domain, then click view
3
Review subject, issuer and certificate details
4
Download the certificate or public key if needed
Field Notes
Subject
Information about the certificate owner such as domain and organization.
Issuer
The CA that issued the certificate.
Certificate Details
Includes validity, public key, fingerprints and SANs.
Security & Privacy
- Certificate parsing happens on the server and is not sent to third parties
- Uploaded files are used only for this request and not stored
- Domain lookup only establishes SSL connections to fetch certificates
Limitations
- Max file size 10MB
- Supported formats: .pem .crt .cer
- Default port is 443 for domain queries
FAQ
Why does parsing fail?
Make sure the certificate is complete PEM with BEGIN/END markers.
Domain query failed?
Verify the domain is reachable and the port is correct.
Public key download is missing
Some certificate types do not expose a public key file.