Verify certificate trust across Android, iOS, Chrome, and Firefox
An SSL/TLS certificate chain is the sequence of certificates from your server's leaf certificate through intermediate CA certificates up to a trusted root CA. If any part of this chain is broken, missing, or untrusted, browsers and devices will show security warnings. Different platforms (Android, iOS, Chrome, Firefox) maintain different root CA trust stores, which means a certificate trusted on one platform may not be trusted on another.
Many SSL issues are invisible in desktop browsers but cause errors on mobile devices — especially older Android versions. Common problems include missing intermediate certificates, expired root CAs, and chains that rely on cross-signed roots. This tool connects directly to your server, extracts the full chain, and checks each certificate against platform-specific trust stores so you can identify exactly where the problem is.
Android 7.0 through Android 15, iOS/macOS (Apple Trust Store), Google Chrome (Chrome Root Store), and Mozilla Firefox (NSS). The tool flags the minimum Android version required to trust your root CA and provides specific fix recommendations for known problematic chains like Sectigo R46.