Pemeriksa Sertifikat SSL
Inspect the TLS certificate of any site - expiry, issuer, SANs and chain
100% gratis. Alat ini memerlukan server kami untuk melakukan pekerjaannya, jadi apa yang Anda kirim diproses di sana lalu dibuang - tidak pernah disimpan.
Tentang alat ini
Inspect a website's TLS/SSL certificate - checking its expiry date, issuer, Subject Alternative Names (SANs), and the full certificate chain. Useful for verifying a certificate is valid and won't expire soon, or diagnosing HTTPS trust issues on your own or another site.
Diagnosis situs web yang lambat atau tidak dapat diakses
Kerjakan dari dalam ke luar: apakah host merespons, apakah halaman lambat, dan apakah sertifikatnya masih valid.
- 1Ping ke hostLatensi, jitter, dan kehilangan paket.Buka
- 2Jalankan tes kecepatanAudit performa nyata yang dirender browser.Buka
- 3Periksa sertifikatSertifikat kedaluwarsa memblokir semua pengunjung.Anda di sini
- 4Periksa DNSPastikan rekamannya menunjuk ke tempat yang Anda harapkan.Buka
Cara menggunakan alat ini
- Enter domain/hostQuery live certificate presented by the server over HTTPS.
- Inspect certificate detailsReview issuer, validity period, SAN list, and signature chain.
- Check expiry and coverageConfirm all required hostnames are covered and not near expiration.
- Fix cert/deployment issuesRenew, reissue, or complete chain configuration on server/CDN.
Mengapa menggunakannya
- Prevents production outages caused by expired certificates.
- Diagnoses trust errors from incomplete chain configuration.
- Validates SAN coverage for multi-subdomain deployments.
- Supports proactive HTTPS monitoring and incident prevention.
Penggunaan umum
- Checking cert health before major traffic campaigns.
- Debugging browser “connection not private” warnings.
- Auditing wildcard and SAN certificate deployments.
- Validating post-renewal certificate installation success.
Tips untuk hasil lebih baik
- Renew certificates before expiry window gets tight.
- Include both root and intermediate chain correctly on server.
- Verify all public subdomains in SAN list after reissue.
- Retest from CDN edge hostnames if proxy is involved.
Kesalahan yang harus dihindari
- Renewing certificate but not deploying updated chain.
- Assuming wildcard cert covers every needed hostname pattern.
- Ignoring staging cert warnings until production incident occurs.
- Checking only apex domain while `www` remains misconfigured.
Pertanyaan yang sering diajukan
Browsers will show visitors a security warning and typically block easy access to the site, since an expired certificate can no longer be trusted to verify the site's identity - this is why monitoring expiry dates matters, especially for production sites.
Additional domain names covered by the same certificate - for example, a certificate might cover both "example.com" and "www.example.com" as SANs, so both work correctly under HTTPS with one certificate.
It shows whether the certificate is properly linked back to a trusted root certificate authority through any intermediate certificates - a broken or incomplete chain can cause trust errors in some browsers/devices even if the certificate itself is technically valid.
Yes. Ssl Checker is free for normal use with no account required, and ToolBox does not add a watermark to your result.
Most tools in this category run in your browser so the file stays on your device. If a tool needs a temporary server job, files are handled for that job only and are not kept as a lasting archive.
No install needed. Open Ssl Checker in your browser, add your file or paste your input, then download or copy the result.
Yes on modern mobile browsers. For large files, a desktop browser is usually faster and more reliable.
Try a different quality or format setting, use a smaller input, or open a related tool (for example compress before convert). Keep a copy of the original file before replacing it.
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