SSL & HTTPS Guides

Step-by-step walkthroughs on certificate setup, renewal and security, plus fixes for common errors.

• How to Verify Your SSL Installation and Fix Common Errors with an SSL Checker

  A practical guide to what an SSL checker reports, how to read the result, and how to fix the most common SSL installation errors.

• What's Inside an SSL Certificate? How to Read Any Certificate with a Certificate Decoder

  What fields live inside an SSL certificate and what do they mean? Learn to read the Subject, Issuer, SANs, validity window and fingerprints without leaving your browser.

• CSR Decoder: Verify Your CSR Before You Issue a Certificate

  What a CSR is, how it's generated with openssl, and why you should always verify it with a CSR decoder before submitting. Runs entirely in your browser.

• "Certificate and private key do not match": fix it with a Key Matcher

  "Certificate and private key do not match" is one of the most common SSL errors in Apache, Nginx and cPanel. Learn why it happens and how a private certificate key matcher that never uploads your key resolves it in seconds.

• PEM vs DER vs PFX vs PKCS#7: SSL Certificate Formats Explained and How to Convert Them

  Understand the difference between PEM, DER, PFX and PKCS#7, which server wants which format, and how to safely convert your certificate right in your browser.

• Free SSL vs Paid SSL: Which One Should You Choose?

  Free SSL or paid SSL? The encryption is the same; the difference is validation and warranty. We clarify which one is enough for you.

• SSL and SEO: How HTTPS Affects Google Rankings

  Why HTTPS SEO matters: the Google ranking signal, trust, conversions and a safe migration explained step by step.

• HTTP to HTTPS Migration: Step-by-Step Guide

  The complete HTTPS migration process, from certificate to 301 redirects, mixed content and HSTS, plus a point-by-point checklist.

• SSL File Types Explained: CRT, KEY, PEM, PFX, CSR and CA Bundle

  A practical guide explaining CRT, KEY, PEM, PFX, CSR and CA Bundle files and exactly which one your web server needs.

• What Is Let's Encrypt and How Does Free SSL Work?

  What Let's Encrypt is, how free SSL works, the ACME protocol, domain validation methods, and the reasoning behind 90-day certificates.

• How to Check an SSL Certificate: Validity and Expiry

  Practical, step-by-step ways to check a website's SSL certificate in the browser, with openssl and online tools.

• ERR_CERT_DATE_INVALID: How to Fix the "Certificate Has Expired" Error

  ERR_CERT_DATE_INVALID has two causes: a wrong device clock or an expired certificate. Practical fixes for both sides.

• How to Install a Free SSL Certificate in Plesk (Step by Step)

  A practical guide to uploading a free SSL certificate in Plesk, assigning it to your domain, and enabling HTTPS redirection.

• How to Install a Free SSL Certificate in cPanel? A Step-by-Step Guide

  Move your site to free HTTPS in minutes by pasting your CRT, KEY, and CA Bundle files into cPanel's SSL/TLS manager.

• How to Get a Free SSL with 90 Day Free SSL? 3 Steps

  Enter your domain and email, verify with a DNS TXT record or an HTTP file, and download all your certificate files in a single ZIP — explained from start to finish.

• SSL Setup in Nginx and a 301 Redirect from HTTP to HTTPS

  Define the paths to fullchain.pem and private.key in your server block and move all HTTP traffic to HTTPS with a permanent 301.

• How to Install a Free SSL Certificate on WordPress and Switch to HTTPS

  Upload the certificate to your server, set the WordPress addresses to HTTPS, fix mixed content, and redirect all traffic to a secure connection.

• SSL Setup with PFX in IIS (Windows) — Password and Binding

  Import the PFX, which combines the certificate and private key into a single file, into Windows IIS, enter its password, and publish the site with a 443 binding.

• SSL Certificate Types: The Differences Between DV, OV and EV

  All three validation levels offer the same encryption; the difference is how deeply the certificate authority verifies your identity.

• What Is HSTS and How Do You Enable It? (HTTP Strict Transport Security)

  With the Strict-Transport-Security header, force the browser to connect to your site over HTTPS only and block SSL stripping attacks.

• SSL Setup in Apache and HTTPS Redirection with .htaccess

  Define the certificate, key, and chain paths inside your VirtualHost and redirect all traffic to secure HTTPS with .htaccess.

• How to Fix the ERR_SSL_PROTOCOL_ERROR Error

  Eliminate common causes one by one — date/time, an old TLS version, and server configuration — to resolve the connection error.

• Why Do Browsers Mark Non-HTTPS Sites as "Not Secure"?

  Browsers have flagged HTTP sites for years; we explain what the warning means, its impact on trust and SEO, and the free solution.

• What Is SSL/TLS and Why Does It Matter? SEO, Trust, and Ranking

  Learn what SSL/TLS is, why HTTPS has become mandatory, and its impact in terms of SEO, trust, and browser warnings.

• What Is a Wildcard SSL? When to Use It and Obtaining It with DNS-01

  Learn the advantages and limits of securing unlimited subdomains (*.yourdomain.com) with a single certificate, and how to obtain it for free with DNS-01.

• "Your Connection Is Not Private" / NET::ERR_CERT Error and Its Solutions

  Fix the three most common causes of the browser's NET::ERR_CERT warning — an expired certificate, a missing intermediate chain, and mixed content — step by step.

• How to Fix the Mixed Content Warning?

  Find the http:// image, script, and style resources on your HTTPS page, make them secure, and regain the lost lock icon.

• SSL Certificate Renewal: How to Renew Every 90 Days?

  Learn step by step how to renew your 90-day certificate, the reminder emails, and the automatic renewal setup.