Pricing

Pay per usage

SSL Certificate Checker & Expiry Monitor

Check SSL/TLS certificates for a list of domains: expiry date, days remaining, issuer, SAN, TLS version, chain trust. Flags expired and soon-to-expire certs — ideal as a scheduled expiry monitor. Free.

Pricing

Pay per usage

Rating

0.0

(0)

Developer

D N

Actor stats

Bookmarked

Total users

Monthly active users

2 days ago

Last modified

Input

Field	Type	Description
`domains`	array	Hostnames to check. Append `:port` for non-standard ports (default 443).
`warningDays`	integer	Flag certificates expiring within this many days as `expiring_soon` (default 30).

Output

{
  "domain": "example.com",
  "port": 443,
  "status": "valid",
  "subjectCN": "example.com",
  "issuerCN": "Cloudflare TLS Issuing ECC CA 3",
  "issuerOrg": "SSL Corporation",
  "validFrom": "2025-08-29T00:00:00.000Z",
  "validTo": "2026-08-29T21:41:26.000Z",
  "daysRemaining": 48,
  "expired": false,
  "subjectAltNames": ["example.com", "www.example.com"],
  "tlsProtocol": "TLSv1.3",
  "chainTrusted": true,
  "selfSigned": false
}

status is valid, expiring_soon, expired or error (host unreachable, no TLS…). A bad host never crashes the run — it produces an error item and the Actor continues.

Use cases

Monitor certificate expiry across all your domains (schedule daily, alert on expiring_soon).
Audit a client's infrastructure before a security review.
Detect self-signed or untrusted chains in bulk.
Verify certificates after renewal or CDN migration.

Limitations & fair use

The Actor opens one TLS connection per host with a polite delay. It reads the certificate only — no application data is requested.

Free tool by fit_melon — more French business data & developer utilities on the profile. ⭐ if useful!

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