Inspect returned certificate fields, issuer, subject, SAN, expiry and protocol. Date-window wording and the local grade describe limited observations.
Method, limits and data
Dates alone cannot establish chain or hostname trust. The existing connection now requires certificate verification; a failed handshake is unavailable rather than bypassed. A local grade is not a security audit. Examples and reference text are illustrative, not current measurements or guarantees of availability, precision or logging practices.
The site connects to the checked public address for the requested hostname. Results can be copied as JSON; this page adds no persistent history or certificate download.
How to use
- Enter the exact hostname and request a check.
- Compare SAN, dates and protocol; copy the returned fields without treating the grade as certification.
A certificate dated around today can still have an untrusted issuer or wrong hostname. An invalid date produces an unknown indicator.
Does a current date window prove a trustworthy site?
No. Trust, identity, revocation and application policy are separate checks. Inspect the fields and any connection failure.
Invalid or empty input clears the previous answer. A timeout or refusal is a failed observation, not a zero measurement or proof of absence. Changing input discards late answers; retry only when ready.
Reference texts, snapshot 27 October 2026; not a live service check.
SSL Certificate Checker
Inspect returned certificate fields, issuer, subject, SAN, expiry and protocol. Date-window wording and the local grade describe limited observations.
Local indicator only; dates and a protocol label do not certify chain or hostname trust.
Expires in days
📜 Certificate Details
📅 Validity Period
🌐 Subject Alternative Names
Copied
Copy failed. Select the result and copy it manually.
About SSL Certificate Checker
Inspect returned certificate fields, issuer, subject, SAN, expiry and protocol. Date-window wording and the local grade describe limited observations.
Inspect returned certificate fields as one server observation. The grade is a local indicator, not an overall security audit. Consult the site privacy policy for retention; this page makes no separate promise that requests or responses are never logged.
Dates alone cannot establish chain or hostname trust. The existing connection now requires certificate verification; a failed handshake is unavailable rather than bypassed. A local grade is not a security audit.
The site connects to the checked public address for the requested hostname. Results can be copied as JSON; this page adds no persistent history or certificate download.
A certificate dated around today can still have an untrusted issuer or wrong hostname. An invalid date produces an unknown indicator.
Use Cases
How to use
Enter the exact hostname and request a check.
Compare SAN, dates and protocol; copy the returned fields without treating the grade as certification.
Read the grade card on the left: A+ for TLS 1.3, A for TLS 1.2, C when fewer than 30 days remain and F when the certificate is invalid or expired.
Check Certificate Details for issuer, subject, serial number, signature algorithm, key size and protocol, and Validity Period for the Valid From and Valid Until dates.
Scan the Subject Alternative Names list to confirm every hostname the certificate covers, then click Copy JSON to keep the full result.
Pro Tips
- Run the SSL Checker from a different network (mobile data vs. Wi-Fi) to compare results and spot location-specific issues.
- Re-run the SSL Checker a few minutes later if results look odd — transient DNS or routing glitches are common.
- Compare against a known-good domain to confirm that unexpected results are not just normal behavior.
- Screenshot or copy results when filing a support ticket — having the raw SSL Checker output speeds up debugging.
- Combine the SSL Checker with our other network tools (DNS, SSL, headers) for a full picture of a target endpoint.
Frequently Asked Questions
The page is available without an API key. The existing endpoint limits requests to 20 per minute; a 429 means wait and retry explicitly.
The hostname goes to this site and its server connects to the target. Consult the site privacy policy for retention; this checker makes no separate no-logging promise. Copy and JSON export are browser actions.
No. For security, the SSL Checker blocks private IP ranges, localhost, and cloud metadata endpoints to prevent SSRF abuse.
A successful request is one certificate observation from this server. Dates and the displayed local grade do not certify overall website security or continued availability.
The SSL Checker is a web interface for occasional checks. For bulk or automated use, consider dedicated APIs or command-line tools.
Use a browser with JavaScript. Clipboard and download behavior depends on browser capabilities and permissions.
No. Trust, identity, revocation and application policy are separate checks. Inspect the fields and any connection failure.