An SSL/TLS certificate is what turns http:// into https:// — the padlock that tells visitors their connection is encrypted. When it expires, browsers flash frightening warnings and visitors leave. Our free SSL Checker connects to any domain on port 443, reads its live certificate and reports the issuer, the validity window and exactly how many days remain. No signup, no installation — just paste a domain.
Site owners use it as a safety net alongside automated renewal: certificates from free providers last only 90 days, and a failed renewal can take a store offline for hours. Agencies audit client sites in bulk to catch certificates expiring during holidays, and shoppers use it to sanity-check unfamiliar websites before entering payment details.
The verdict is simple: valid means more than 30 days of life left, expiring-soon means under 30 days and renewal should be scheduled now, and expired means browsers will block the site until a new certificate is installed. Run it once a month on every domain you manage — it takes five seconds and prevents a very bad day.
SSL Checker
Inspect any domain's TLS certificate: issuer, validity dates and how many days until it expires.
How to use
- Enter the domain name (e.g. example.com).
- Click “Check Certificate”.
- Read the verdict: valid, expiring-soon or expired.
- Note the issuer and the exact validity dates.
- If the verdict is expiring-soon, renew the certificate now.
FAQs
How often should I check my certificates?
Monthly is a good rhythm for most sites; weekly for high-traffic stores. Free certificates renew every 90 days automatically, but automation fails silently more often than people expect.
The verdict says valid but browsers still warn. Why?
Expiry is only one cause. Warnings also come from mismatched domain names, incomplete certificate chains or old TLS versions — each needs a separate fix from your host or CDN.
Does an SSL certificate help my Google rankings?
Google treats HTTPS as a lightweight ranking signal, but the bigger win is trust: Chrome marks non-HTTPS pages “Not secure”, which directly costs clicks and conversions.