SSL Certificate Checker
📦 SSL Certificate Checker Source Code $4.99
Get the complete, ready‑to‑deploy HTML file with all styling and logic. This is the exact code powering the demo above — no dependencies, fully offline, and 100% client‑side. Perfect for your portfolio, client projects, or resale. One-time purchase, lifetime access.
What is an SSL Certificate Checker?
An SSL Certificate Checker decodes a PEM‑encoded X.509 certificate and displays its contents in a readable format. It extracts the subject, issuer, validity period, serial number, and fingerprints, and checks whether the certificate has expired or is still valid. The tool runs entirely in your browser, so your certificates never leave your machine.
How to Use
- Paste the PEM certificate (including the BEGIN and END lines) into the text area. You can also paste a certificate chain—the tool will decode the first certificate.
- Click "Decode" to parse the certificate. The output panel will show the subject, issuer, validity dates, serial number, and fingerprints.
- Review the validity status—the tool highlights whether the certificate is currently valid, expired, or will expire soon. Use "Copy Details" to export the results as text.
Frequently Asked Questions
Is my certificate data safe?
Absolutely. Everything happens locally in your browser. The certificate is never transmitted, stored, or logged on any server. You can safely inspect even sensitive or production certificates.
Does this tool work offline?
Yes, completely. There are no external dependencies or network calls. Save the HTML file and you can decode certificates anytime, even without an internet connection.
What certificate formats does it support?
The tool parses standard PEM‑encoded X.509 certificates (the most common format used by web servers). It can also handle certificate chains, but will only decode the first certificate in the chain.
Disclaimer: This tool performs all operations locally in your browser. No data is stored, transmitted, or logged.