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That one website that checks if a website's SSL certificate is set up right

Why it's the pick

SSL Labs runs a deep test of any public HTTPS server, covering the certificate, chain, protocols and ciphers, and sums it up as a letter grade. You can keep your result off its public boards. A full test takes a little while; for a quick check of expiry and chain, use SSL Shopper.

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Also good

SSL Shopper SSL Checker sslshopper.com Quick check of expiry, chain and hostname FreeNo signup Link checked Oct 1

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