Title: SSL Checker Author: Kriko Published: Jul 20, 2026 Last modified: Jul 21, 2026 --- 1. [Home](https://kriko.io/) / 2. [Tools](https://kriko.io/tools) / 3. SSL Checker # SSL Checker Loading SSL Checker… 1 ## Enter a domain An SSL/TLS certificate encrypts traffic and proves a site's identity. An expired or misconfigured certificate breaks trust and can take a site offline in visitors' browsers. 2 ## Review the certificate details The tool reports the issuer, validity dates, covered hostnames and the chain, so you can confirm the certificate is valid and catch an expiry before your users do. ## Popular Tools ![DNS Checker](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/assets/img/ tools/tool-dns-checker.svg) ### DNS Checker Go to Tool ![SERP Preview](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/assets/img/ tools/tool-serp-preview.svg) ### SERP Preview Go to Tool ![robots.txt Generator](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/ assets/img/tools/tool-robots-txt.svg) ### robots.txt Generator Go to Tool ![Meta Title & Description Length](https://kriko.io/wp-content/plugins/kriko-seo- tools/src/assets/img/tools/tool-meta-length-checker.svg) ### Meta Title & Description Length Go to Tool ![Redirect Checker](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/assets/ img/tools/tool-redirect-checker.svg) ### Redirect Checker Go to Tool ![What is My IP](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/assets/ img/tools/tool-ip.svg) ### What is My IP Go to Tool ## Other Tools ![Gzip Checker](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/assets/img/ tools/tool-gzip-checker.svg) ### Gzip Checker Go to Tool ![CSV to JSON Converter](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/ assets/img/tools/tool-csv-json-converter.svg) ### CSV to JSON Converter Go to Tool ![RGB to HEX](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/assets/img/ tools/tool-rgb-hex.svg) ### RGB to HEX Go to Tool ![Base64 Encode / Decode](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/ assets/img/tools/tool-base64-encode-decode.svg) ### Base64 Encode / Decode Go to Tool ![UTM Builder](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/assets/img/ tools/tool-utm-builder.svg) ### UTM Builder Go to Tool ![GTM Container Checker](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/ assets/img/tools/tool-gtm-checker.svg) ### GTM Container Checker Go to Tool ![Meta Pixel Checker](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/assets/ img/tools/tool-fb-pixel-checker.svg) ### Meta Pixel Checker Go to Tool ![Open Graph / Twitter Preview](https://kriko.io/wp-content/plugins/kriko-seo-tools/ src/assets/img/tools/tool-og-preview.svg) ### Open Graph / Twitter Preview Go to Tool ![Keyword Density Checker](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/ assets/img/tools/tool-keyword-density-checker.svg) ### Keyword Density Checker Go to Tool ![Sitemap Validator](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/assets/ img/tools/tool-sitemap-validator.svg) ### Sitemap Validator Go to Tool ![Cookie Scanner](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/assets/ img/tools/tool-tracking-scanner.svg) ### Cookie Scanner Go to Tool ![Text to Slug](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/assets/img/ tools/tool-text-to-slug.svg) ### Text to Slug Go to Tool ![Line Break Remover](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/assets/ img/tools/tool-line-break-remover.svg) ### Line Break Remover Go to Tool ![Text Diff Checker](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/assets/ img/tools/tool-text-diff-checker.svg) ### Text Diff Checker Go to Tool ![Markdown to HTML](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/assets/ img/tools/tool-markdown-to-html.svg) ### Markdown to HTML Go to Tool ![A/B Test Sample Size](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/ assets/img/tools/tool-ab-test-sample-size.svg) ### A/B Test Sample Size Go to Tool ![CTR Calculator](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/assets/ img/tools/tool-ctr-calculator.svg) ### CTR Calculator Go to Tool ![ROI Calculator](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/assets/ img/tools/tool-roi-calculator.svg) ### ROI Calculator Go to Tool ![ROAS Calculator](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/assets/ img/tools/tool-roas-calculator.svg) ### ROAS Calculator Go to Tool ![Conversion Rate Calculator](https://kriko.io/wp-content/plugins/kriko-seo-tools/ src/assets/img/tools/tool-conversion-rate-calculator.svg) ### Conversion Rate Calculator Go to Tool ![Hash Generator](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/assets/ img/tools/tool-hash-generator.svg) ### Hash Generator Go to Tool ![Analytics APP Debugger](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/ assets/img/tools/tool-firebase-hex-decoder.svg) ### Analytics APP Debugger Go to Tool ![Whois](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/assets/img/tools/ tool-whois.svg) ### Whois Go to Tool ![Reverse IP Lookup](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/assets/ img/tools/tool-ip-lookup.svg) ### Reverse IP Lookup Go to Tool ![HTTP Status Checker](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/assets/ img/tools/tool-status-checker.svg) ### HTTP Status Checker Go to Tool ![Brotli Checker](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/assets/ img/tools/tool-brotli-checker.svg) ### Brotli Checker Go to Tool ⌊JPG to PNG⌉⌊JPG to PNG⌉ ### JPG to PNG Go to Tool ⌊WEBP to PNG⌉⌊WEBP to PNG⌉ ### WEBP to PNG Go to Tool ![Image Resizer](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/assets/ img/tools/tool-resizer.svg) ### Image Resizer Go to Tool ⌊PNG to JPG⌉⌊PNG to JPG⌉ ### PNG to JPG Go to Tool ![Image Compressor](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/assets/ img/tools/tool-compressor.svg) ### Image Compressor Go to Tool ![HTML Formatter](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/assets/ img/tools/tool-html-formatter.svg) ### HTML Formatter Go to Tool ![PNG to ICO](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/assets/img/ tools/tool-ico.svg) ### PNG to ICO Go to Tool ![Word Counter](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/assets/img/ tools/tool-word-counter.svg) ### Word Counter Go to Tool ![JSON Formatter](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/assets/ img/tools/tool-json-formatter.svg) ### JSON Formatter Go to Tool ![Case Converter](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/assets/ img/tools/tool-case-converter.svg) ### Case Converter Go to Tool ![XML Formatter](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/assets/ img/tools/tool-xml-formatter.svg) ### XML Formatter Go to Tool ![URL Encoder & Decoder](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/ assets/img/tools/tool-url-encoder.svg) ### URL Encoder & Decoder Go to Tool ![Password Generator](https://kriko.io/wp-content/plugins/kriko-seo-tools/src/assets/ img/tools/tool-password.svg) ### Password Generator Go to Tool ## What Is an SSL Checker? An SSL Checker is a technical analysis tool used to examine the SSL/TLS certificate installed on a domain. It helps determine whether the certificate is currently valid, which organisation issued it, when it became active, when it expires, and which hostnames it covers. SSL/TLS certificates support secure HTTPS connections by helping encrypt data exchanged between a website and its visitors. They also allow browsers to verify that the certificate presented by a server is valid for the requested hostname. A missing, expired, or incorrectly configured certificate can cause browser warnings, interrupted visits, and loss of user confidence. ## How to Check an SSL Certificate Enter the domain you want to inspect and start the check. The tool retrieves the certificate presented by the server and displays its most important details in a readable format. The report may include the certificate issuer, activation and expiry dates, covered hostnames, and certificate chain. Reviewing these fields helps you confirm that the certificate has been issued for the correct domain and remains within its validity period. The SSL Checker provided on this page is designed to report these details in a clear summary. When entering the address, use the domain or hostname you want to test. Checking the exact hostname is important because certificates may cover the root domain, a particular subdomain, several hostnames, or wildcard subdomains depending on their configuration. ## Understanding SSL Certificate Details The issuer identifies the certificate authority responsible for issuing the certificate. The validity dates show the period during which the certificate can be accepted. A certificate that has passed its expiry date may trigger a security warning even when the website itself remains online. Covered hostnames are generally listed through the Subject Alternative Name field. A single certificate can include multiple domain names or hostnames, but the address visited by the user must match an identity included in the certificate. Hostname validation is an essential part of confirming that a secure connection reaches the intended service. The certificate chain shows how the website certificate connects through intermediate certificates to a trusted root certificate. Missing or incorrectly served intermediate certificates can cause trust problems on some browsers, operating systems, or devices. ## Why SSL Certificate Checks Matter SSL certificates have limited validity periods and must be renewed before they expire. Renewal automation can reduce manual work, but configuration errors, failed validation, server changes, or incomplete deployment can still result in an invalid certificate being served. Regular SSL checks help website owners identify upcoming expiry dates, hostname mismatches, incomplete certificate chains, and unexpected certificate issuers before visitors encounter a warning. These checks are especially valuable after a domain migration, hosting change, CDN implementation, server update, or certificate renewal. For businesses operating several domains or subdomains, certificate checks can also help confirm that every important hostname is correctly protected. Monitoring certificate health supports secure access, uninterrupted user journeys, and a more reliable digital experience. ## Track the digital heartbeat with Kriko Subscribe to receive curated insights, news, and ideas shaping the digital landscape. By checking this box, you acknowledge and accept our [privacy policy](https://kriko.io/privacy-policy).