Check SSL certificates by domain for expiry and issuer. See example.com grade A with 45 days left via online check, free, no signup.
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Quick answer: SSL Checker — Check SSL certificate Free, no signup, runs in your browser. See below for the interactive tool, 4-step guide and FAQs.
Check HTTPS certificate grade, issuer and expiry via SSL Labs (proxied through api.allorigins.win) with a browser fallback. Ideal for quickly verifying if a site serves valid HTTPS.
Host: example.com
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It reports grade, issuer, subject, notBefore and notAfter, SAN entries, chain health and days remaining. For illustration, 30 days left advises renewal planning, while 12 days left demands urgent rotation. Results arrive through SSL Labs proxy with timestamp. Cross-verify critical hosts via browser padlock or openssl commands as well, since caching may delay freshness.
Online operation only: queries travel through allorigins proxy toward SSL Labs, so hostname and IP share with intermediaries and cache up to 24 hours. For instance, example dot com lookups fall under proxy logging policies. No certificate details persist with us. Avoid probing secret internal hosts publicly; inspect those with local openssl instead.
We retain no certificate payloads; proxy and Labs may log requests per their policies for a day. For example, re-query after renewal to bust stale cache. Hostnames linger in browser history, so employ private windows for sensitive domains. All analysis requires connectivity. No upload occurs beyond necessary proxy relay for grading.
Automated monitors should poll expiry daily, alert at 30 and 14 and 7 day thresholds, and open renewal tickets automatically. For example, example dot com at 45 days stays quiet, while 12 days triggers paging. Combine external grading with internal openssl checks, track SAN coverage, and rehearse rotation runbooks before incidents force hasty changes.
This checker fetches certificate grade, issuer, subject, SAN coverage, chain status and countdown for public domains. Example 1: example dot com shows grade A with 45 days left signalling health. Example 2: a host with 12 days left triggers urgent renewal to avert outage. Administrators prevent downtime, auditors verify encryption posture and developers confirm staging parity. Results include timestamp and cache age because proxy stores grades up to 24 hours. Online operation mandatory; disconnected attempts fail. Correlate grades with protocol support to prioritize remediation across portfolios.
Reference grade table: A means robust protocols and chains | B means minor weaknesses | C means outdated TLS | F means severe failure | expiry under 21 days warns | expiry under 7 days critical. Enter bare domain, press Check, review issuer and notAfter date. Edge case: wildcard SANs listing five hosts need every name validated; missing intermediates downgrade grade despite valid leaf. Host and IP share with proxy and cache a day, so fresh renewals demand re-query. Avoid secret internal names publicly; test those with local openssl commands. Clinics rehearsing SAN coverage and intermediate renewal simulate downgrade scenarios that teach chain hygiene across administrators while updating inventory sheets quarterly now daily and reminders and audits for coverage daily.
Query example dot com, observe grade A and 45 days left, document issuer and SANs for inventory. Second trial: probe a near-expiry host with 12 days left, schedule renewal, re-query to confirm fresh timestamp. Limitation: grades reflect public trust only, cached views lag hours, and private keys must never paste anywhere. For address structure after securing hosts, see the parser at /url-parser for hostname extraction. For epoch translation of notAfter dates, see the converter at /timestamp-converter for scheduling.