Know the expiry.
Before browsers do.
Drop a certificate file (.pem / .crt) to read issue and expiry dates — or enter them in the calculator below.
Drop a certificate
.pem / .crt · fills expiry below
Cert dates filled when we can read them · nothing uploaded
No credit card required · your account in one click
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Calculate expiry
docstoc issues 90-day Let's Encrypt certificates and reminds you before renewal is due.
Expiry date—
Days remaining—
Renew with margin — DNS propagation and validation can take time.
Why this matters
An expired SSL/TLS certificate shows visitors a security warning and can block access. Automated renewal reminders exist because manually tracking expiry across every domain doesn't scale.
How SSL automation works → · Trust badges →
FAQs
Why 90 days for the default validity period?
Let's Encrypt — the certificate authority docstoc automates — issues certificates valid for 90 days by default, shorter than the 1-year certificates some paid providers sell.
What happens if a certificate expires?
Browsers show a security warning and block or flag the site as untrusted. Renewing before expiry avoids any visible disruption to visitors.
Can docstoc remind me automatically instead of me tracking this by hand?
Yes — once a domain is added in docstoc, it tracks expiry for you and emails a reminder before the certificate lapses, with a one-click renewal path.