How to use Email SSL Test
- Paste or load a PEM certificate into Email SSL Test.
- Click Parse certificate — Email SSL Test processes everything on your device.
- Read the subject, issuer, validity dates and expiry that Email SSL Test lays out for you.
About this tool
Email SSL Test is a static, client-side tool with no backend. Email SSL Test decodes a pasted PEM certificate by walking its ASN.1/DER structure locally to read subject, issuer, validity window and serial.
The expiry countdown is computed locally, and nothing about the certificate is transmitted. Your input never leaves the page, and no account or install is required.
Frequently asked questions
How do I use Email SSL Test?
Email SSL Test runs entirely on your device: add your input, and it checks it locally in real time.
Is Email SSL Test free to use?
Yes — Email SSL Test is completely free, with no usage limits.
Is my input private in Email SSL Test?
Yes — your input never leaves your device; Email SSL Test does all the work in your browser.
How do I inspect a live site's certificate in Email SSL Test?
Export the certificate from your browser's padlock as PEM and paste it into Email SSL Test; it decodes the ASN.1/DER fields entirely on your device.
Can I use Email SSL Test without a connection?
Yes — after the first load Email SSL Test runs entirely offline.