You’ve seen the padlock icon in your browser’s address bar. Most sites use “https” instead of “http.” But do you know what that means for your website and visitors?
That padlock represents an SSL certificate and is crucial for website security. Whether you run a blog, online store, or business site, understanding SSL certificates is essential.
You’ll learn what an SSL certificate is, how it protects your site and visitors, the types available, and how to set one up.
Table of Contents
What Is an SSL Certificate?
An SSL certificate is a digital file that creates an encrypted connection between a web server and a browser. Think of it as a secure tunnel that protects any data traveling between your website and your visitors.
When someone visits your site, their browser and your server exchange information. Without encryption, it travels in plain text and can be read by anyone who intercepts it. With SSL, data is scrambled so only the intended recipient can decode it.
The certificate itself contains several key pieces of information:
- The domain name the certificate was issued for
- The person, organization, or company the certificate was issued
- The certificate authority (CA) that issued it
- The CA’s digital signature
- Associated subdomains
- Issue and expiration dates
- The public encryption key
This information allows browsers to verify that your website is legitimate and that any data exchanged is protected.
What’s the Difference Between SSL and TLS?
Many people confuse SSL and TLS. They’re different protocols, though often used interchangeably.
SSL (Secure Sockets Layer) was the original encryption protocol from the mid-1990s. Security flaws led to its replacement. TLS (Transport Layer Security) has been the more secure protocol since 1999.
We still say “SSL certificates” out of habit. The term stuck, though modern certificates use TLS. You might see these called TLS, SSL/TLS, or SSL certificates. They all refer to the same thing.
The important takeaway is that if you’re getting a certificate today, it’s using the TLS protocol, which is more secure than older SSL versions.
Why Does Your Website Need an SSL Certificate?
SSL certificates serve three critical purposes for your website: encryption, authentication, and trust.
Encryption Protects Sensitive Data
Any time your visitors enter information on your website, that data needs protection. This includes login credentials, contact form submissions, payment details, and personal information.
Without an SSL certificate, data travels in plain text and can be intercepted. With SSL, the data is unreadable to anyone except the recipient.
This matters most on websites that handle sensitive information, such as eCommerce stores, membership sites, or those with user accounts.
Authentication Prevents Impersonation
SSL certificates verify that your website is, in fact, yours. When a browser connects to a site with an SSL certificate, it checks that the certificate is valid and was issued for that specific domain.
This prevents attackers from creating fake versions of your site to steal visitor information. If someone tries to impersonate your website, they won’t have a valid certificate for your domain. Browsers will warn visitors that something isn’t right.
Trust Signals Boost Conversions
Modern browsers make it obvious when a site lacks SSL protection. Chrome, Firefox, Safari, and Edge all display warnings for sites without valid certificates. Warnings can range from a website not secure warning to full-page notices that discourage visitors from continuing.
On the flip side, the padlock icon and https in your URL signal trustworthiness. For eCommerce sites, this cue can mean the difference between purchase and abandonment.
Search Engines Prefer Secure Sites
Google confirmed years ago that HTTPS is a ranking factor. While not the most heavily weighted signal, an SSL certificate can give your site a slight edge over competitors who don’t have one.
Browsers now restrict certain features on non-HTTPS sites. Some APIs and browser features won’t work without a secure connection.
How Does an SSL Certificate Work?
Understanding the technical side helps you appreciate what’s happening behind the scenes every time someone visits your site. The TLS handshake occurs in milliseconds.
Here’s how it works:
- The browser requests a connection. When someone types your URL or clicks a link to your site, their browser initiates a secure connection to your server.
- Your server replies with its SSL certificate and public key for encryption.
- The browser checks that the certificate is valid, not expired, issued by a trusted certificate authority, and matches the domain being visited.
- If everything checks out, the browser creates a session key, encrypts it with your public key, and sends it to your server.
- The server decrypts the session key using its private key. Now, both browser and server use this key to exchange encrypted data.
This system uses two types of encryption. The initial handshake uses asymmetric encryption. That involves a public key that’s shared openly and a private key kept secret on the server. After the session key is set up, both sides switch to symmetric encryption. Symmetric encryption is faster and more efficient for ongoing communication.
Even if data is intercepted, it’s indecipherable without the session key, which itself was protected by your private key that stays on the server.
Types of SSL Certificates
Not all SSL certificates are alike. They vary by validation level and the number of domains they cover.
Validation level shows how thoroughly the certificate authority verifies your identity. Higher validation means more checks, not stronger encryption.
Domain Validation (DV) Certificates
DV certificates are the most basic type. The certificate authority only verifies that you control the domain you’re requesting the certificate for. This typically involves responding to an email sent to the domain’s admin address or adding a specific DNS record.
These certificates are quick to obtain, often within minutes, and are usually the most affordable option. They’re perfectly suitable for blogs, informational websites, and sites that don’t handle sensitive transactions.
Organization Validation (OV) Certificates
OV certificates add another layer of verification. In addition to proving domain ownership, you must provide documents that verify your organization is real and legitimate. This may include business registration documents, verifying your physical address, and phone verification.
This process usually takes a few days. The certificate shows that a real organization stands behind the website. These are often used by businesses, nonprofits, and government organizations.
Extended Validation (EV) Certificates
EV certificates require the most rigorous verification process. Certificate authorities conduct extensive background checks on the organization, including legal existence, operational status, and physical location.
These certificates are usually used by banks, financial institutions, large eCommerce companies, and enterprise businesses. The validation process can take one to two weeks. These certificates cost more.
Beyond validation levels, certificates also differ in the number of domains they protect.
Single-Domain Certificates
As the name suggests, these certificates protect a specific domain, such as example.com or www.example.com. If you have a straightforward website with one domain, this is all you need.
Wildcard Certificates
Wildcard certificates protect a domain and all its subdomains. For example.com, this covers blog.example.com, shop.example.com, mail.example.com, and other subdomains you create.
This is a cost-effective option if you run multiple subdomains and want to secure them all with a single certificate.
Multi-Domain Certificates
Also called SAN (Subject Alternative Name) certificates or UCC (Unified Communications Certificates), these protect multiple domains with a single certificate. You might use one to secure example.com, example.org, and example.net simultaneously.
These are useful for businesses that operate several related websites and want to manage security from a single certificate.
How to Check If a Website Has an SSL Certificate
Checking whether a site has a valid SSL certificate is pretty straightforward. Here are a few methods you can use:
Check the URL
The simplest method is looking at the URL. Secure sites use https:// at the beginning, while unsecured sites use http://. The s stands for secure and indicates that SSL/TLS encryption is active.
All major browsers will usually display a padlock icon in the address bar for sites with valid SSL certificates. You can click this icon to see more details about the certificate, including who issued it, when it expires, and what domains it covers.
Watch for Browser Warnings
If a certificate is expired, invalid, or missing, browsers will warn you. This might be a Not Secure label next to the URL or a full-page warning that you need to click through to proceed.
Use Online SSL Checker Tools
If you want more detailed information, free tools like SSL Labs SSL Server Test can analyze a site’s certificate and provide a comprehensive security report. This is useful if you’re checking your own site’s configuration. All you need to do is head over to the site and enter your URL.
How to Get an SSL Certificate
Luckily, getting an SSL certificate for your website is easier than ever. Here are your main options:
Get One Through Your Hosting Provider
Many WordPress hosting providers include free SSL certificates with their hosting plans. At SupportHost, all plans include a free Let’s Encrypt SSL certificate that activates automatically and renews without any action required on your part.
This is the simplest option for most website owners. The certificate is installed and configured for you, and you don’t need to worry about renewals or technical setup.
Use Let’s Encrypt
Let’s Encrypt is a free, automated certificate authority that issues DV certificates. If your host doesn’t provide certificates automatically, you may be able to install a Let’s Encrypt certificate manually or through a control panel like cPanel.
These certificates are valid for 90 days and need to be renewed regularly, but most systems can handle this automatically.
Purchase from a Certificate Authority
If you need an OV or EV certificate or want additional features like warranty coverage, you’ll need to purchase it from a certificate authority, or from your hosting provider. Prices range from around $20 per year for basic DV certificates to several hundred dollars for EV certificates.
SupportHost offers Rapid SSL certificates starting at $21+ per year if you need more than the free Let’s Encrypt option provides. While, wildcard SSL certificates start at $174 per year and GeoTrust True Business ID EV SSL certificates starting at $310+ per year.
After Installation
Once you have an SSL certificate installed, you’ll want to ensure your entire site uses HTTPS. This means updating internal links, setting up redirects from HTTP to HTTPS, and updating any hardcoded URLs in your content or theme files.
If you’re running a WordPress site, you can follow our guide on switching from HTTP to HTTPS for step-by-step instructions.
How Long Does an SSL Certificate Last?
SSL certificate validity periods have shortened over the years for security reasons.
Let’s Encrypt certificates are valid for 90 days. This short period is by design, encouraging automated renewal processes and limiting exposure if a certificate is compromised.
Paid certificates issued by commercial certificate authorities are typically valid for 1 year (13 months maximum). Until 2020, you could get certificates valid for two years, but industry standards changed to improve security.
Regardless of which type you use, make sure you have a renewal process in place. An expired certificate will trigger browser warnings and could make your site inaccessible or appear untrustworthy to visitors.
Most hosting providers and certificate authorities offer automatic renewal, which is highly recommended. The last thing you want is to discover your certificate expired because you forgot to renew it manually.
What About Self-Signed Certificates?
You might come across the option to create a self-signed certificate. Technically, anyone can generate their own SSL certificate without going through a certificate authority.
However, browsers don’t trust them. Self-signed certificates provide encryption but not authentication. There’s no trusted third party verifying that the certificate belongs to who it claims to belong to. As a result, browsers will display prominent security warnings to visitors, which defeats much of the purpose of having a certificate in the first place.
Self-signed certificates can be useful for development and testing environments, but they’re not appropriate for public-facing websites.
FAQs: What is an SSL Certificate?
What’s the difference between SSL and HTTPS?
SSL (or more accurately, TLS) is the encryption protocol. HTTPS is the secure version of HTTP that uses SSL/TLS encryption. When you see “https://” in a URL, it means the site is using SSL/TLS to encrypt the connection.
Will an SSL certificate slow down my website?
The encryption process adds a small amount of overhead, but modern servers handle it efficiently. Any performance impact is negligible and far outweighed by the security and trust benefits. In fact, HTTPS enables HTTP/2, which can actually improve loading speeds.
Do I need an SSL certificate if I don’t collect sensitive information?
Yes. Even if you’re running a simple blog with no login forms or payment processing, an SSL certificate is still important. Browsers mark non-HTTPS sites as “Not Secure,” which can drive away visitors. Plus, HTTPS is a minor ranking factor for search engines.
What happens if my SSL certificate expires?
Visitors will see browser warnings indicating that your site’s certificate has expired. Depending on the browser and settings, they may be blocked from accessing your site entirely. This damages trust and can significantly impact traffic and conversions.
Can I use one SSL certificate for multiple websites?
Yes, with multi-domain (SAN) certificates. These allow you to protect several different domains with a single certificate. Alternatively, wildcard certificates protect one domain and all its subdomains.
Closing Thoughts: What is an SSL Certificate?
SSL certificates have gone from a nice-to-have feature to an absolute necessity for any website. They protect your visitors’ data, verify your site’s authenticity, build trust, and even provide a small SEO boost.
The good news is that getting an SSL certificate has never been easier or more affordable. With free options like Let’s Encrypt and hosting providers that include certificates automatically, there’s no reason to run an unsecured website.
If you’re using a quality hosting provider like SupportHost, your SSL certificate is already included and managed for you. If you need something beyond the free option, paid certificates are available for added features and higher validation levels.
The important thing is making sure your site has one. Your visitors, your search rankings, and your peace of mind will all benefit.
Now over to you. Is your website running on HTTPS? Have you had any experience installing or troubleshooting SSL certificates? Share your thoughts in the comments below.
Ready to build your WordPress site?
Try our service free for 14 days. No obligation, no credit card required.
