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One TLS handshake reads the certificate a site actually presents: issuer, the names it covers, the chain behind it, the protocol — and the number that causes scheduled 2 a.m. outages: days until expiry. Broken and expired certificates get reported, not refused.
One TLS handshake from our server to port 443, certificate read, connection closed. Certificates are public — every browser padlock inspects the same bytes.
Type or paste a public web address. Nothing about your own files or device is involved — only the page you name.
This is one of the few Programs tools that can’t run on your device — browsers deliberately can’t read other websites. Our server fetches the page and sends the result straight back: nothing is stored, and the address is never logged or put into analytics.
Take the result to your clipboard, or save it as a file. No copy is kept on our side — there is no storage for one to sit in.