SSL certificate checker

Check a site's SSL/TLS certificate: issuer, validity, days until expiry, covered names and the negotiated TLS version.

Try . Free, no account needed.

Need this at scale?

The same lookup is one API call at 1 credit / request (one credit is $0.0003 to $0.001 depending on volume), with failed requests free.

cURL

curl "https://api.gridlode.com/v1/domain/ssl?domain=github.com" \
  -H "Authorization: Bearer $GRIDLODE_KEY"

Get 1,000 free credits SSL Certificate Check API docs

FAQ

How long are certificates valid?

Public certificates are limited to 398 days today, and lifetimes are being shortened further over the next few years, so automated renewal and expiry monitoring matter.