What Is an SSL Certificate?
The small file that turns http:// into https:// — and what it's actually doing behind the scenes.
SSLGuides.com is a practical reference for installing, migrating to, and troubleshooting SSL/TLS certificates. No jargon left unexplained, no step skipped — from your first certificate to your tenth server migration.
Start here — what a certificate actually is, how encryption works, and the concepts every other guide builds on.
50 guides → 02Move an existing site from http:// to https:// on your specific platform, host, or framework.
50 guides → 03Practical, step-by-step tasks — generating, installing, renewing, converting, and debugging certificates.
50 guides → 05Vendor comparisons and links — coming soon.
Coming soon → 06How we got from Netscape's original SSL 2.0 to today's TLS 1.3 and free certificates for everyone.
50 guides → 07Reading the specific error your browser or server is throwing, and what actually fixes it.
50 guides →Recently published and updated guides across every category.
The small file that turns http:// into https:// — and what it's actually doing behind the scenes.
The exact order of operations — site URLs, .htaccess, mixed content, and the plugin shortcut.
Your Certificate Signing Request determines what the certificate authority can actually issue — get it right first.
One missing bounds check in OpenSSL exposed private keys across roughly half a million servers.
A reference for the exact error codes browsers throw, translated into plain English.
Everyone says "SSL" but almost nobody's site still uses it. Here's the naming history and why it matters.
Compare wildcard, multi-domain, and OV/EV options from vendors we've reviewed.