SSL Certificates: Why Your Website Needs One

1. What Is SSL Certificate for a Website?

You might've come across the padlock icon on your browser that includes a warning like "Not secure" or "Your connection is not private" that prompts you to complete an additional verification before entering a website. And chances are you're more reluctant to go through that extra step.

But then you have to wonder, "Do I need an SSL certificate for my website?" If you're asking this question, you're already on the right track to making your website more secure and convenient for visitors.

An SSL certificate is a small digital file installed on a web server that authenticates your website's identity and enables an encrypted connection. When a visitor lands on your site, their browser checks the certificate before any data is transferred. If the certificate is valid, all traffic between the browser and server is protected from interception.

If you're wondering "What does SSL certificate stand for?" the SSL part means "Secure Sockets Layer." This is an internet protocol developed in the 1990s to secure communications. The technology most sites actually use today is its successor, TLS (Transport Layer Security), which is faster and significantly more secure. While the world has moved on from using SSL to using only TLS, the two names are used interchangeably in the industry (often as SSL/TLS).

2. How Does an SSL Certificate Work?

Every SSL/TLS certificate uses a pair of cryptographic keys – a public key and a private key. The public key is embedded in the certificate and shared openly. The private key stays on your web server and is never exposed.

When a browser connects to your site, it goes through a process called the TLS handshake, which takes place in milliseconds by transferring small packets. Here's how it works:

1. The browser requests a secure connection and shares which encryption methods it supports.
2. Your server responds with its SSL certificate (containing the public key) and its preferred encryption method.
3. The browser verifies that the certificate was issued by a trusted Certificate Authority (CA).
4. Both sides use the public key to agree on a unique private key.
5. All subsequent data – such as form inputs, login credentials, and payment details – travels encrypted with that session key.
6. With the (newest) TLS 1.3 standard, the server and client can also share a session key to prevent back-and-forth communication once the initial private key has been created.

As such, each SSL certificate carries a standard set of fields the browser reads during this process:

The data is then scrambled by using the encryption method and the public key provided. When it reaches the destination, the data is unscrambled using the session key. Even if someone were to intercept the traffic, they would see only scrambled data that is computationally impossible to decode without the private key.

3. Why Every Website Needs an SSL Certificate Today

Every byte of data your visitors send to your site travels in what is essentially plain text. SSL scrambles that text by ensuring it's encrypted from client to server and vice versa. While anyone on the same network (a coffee shop Wi-Fi, for example) can technically read the information with any number of tools, only knowing the private key involved will allow them to unscramble it.

Furthermore, all browsers will display a "Not Secure" warning in the address bar for any HTTP page that contains a form. For example, Chrome's security indicators actively flag non-HTTPS sites to users. That warning is often reason enough for people to bounce off a site.

A valid certificate also proves that your domain name is genuinely controlled by the entity that requested it. This makes it significantly harder for attackers to impersonate your site, because they can't obtain a certificate for a domain they don't control.

When SSL Is Mandatory

If your site collects credit card information, it usually needs to obey PCI-DSS regulations. In turn, these make end-to-end encryption a legal obligation. While SSL isn't technically mandatory, it's the bare minimum for encrypting user data, so it's often the first thing small websites add.

The same applies to any site handling protected health information (HIPAA) or operating under GDPR in the EU. Even sites without payment processing that run login forms or contact forms expose user data if served over HTTP.

Additionally, if you plan to use advanced APIs that track the user's location or want to provide push notifications, these services often require you to have an SSL certificate so they can be applied.

4. The SEO and Business Case for Going HTTPS

Google confirmed HTTPS as a ranking signal back in 2014, meaning that websites using an SSL certificate (which is the basis for an HTTPS connection) will be prioritized in search results. Alongside using a good domain extension for ecommerce or business websites, it's one of the few ways the URL can influence search rankings.

But apart from actual ranking results, trust drives conversions. The moment a potential visitor gets hit with a giant warning that the website may not be secure because it doesn't have an SSL certificate or isn't using HTTPS, they are much more likely to bounce. That small padlock icon has become so ubiquitous that not seeing it makes people suspicious about a website's true intentions.

Checklist for an SEO-Safe Migration

Switching from HTTP to HTTPS can mean you lose your previous analytical or ranking data or create duplicate pages (some with HTTPS and some without). You need to:

• Implement 301 redirects from every HTTP URL to its HTTPS equivalent
• Update all internal links, canonical tags, and XML sitemaps
• Resubmit your sitemap in Google Search Console.

5. What the Padlock and HTTPS Guarantee and What They Don't

There are two things that the padlock is a definite signal for:

1. The data exchanged between the server and the client (meaning the browser) can't be meaningfully read by third parties.
2. The domain in the certificate matches the domain being visited for verification.

However, it's not an all-clear tool either. Notably, there's no implication that the website is not a scam itself, won't misuse the data, or that you might not get malware by downloading anything from it. Since SSL certificates themselves are relatively easy to get, anyone can technically obtain them and make their operations look more legitimate.

Notably, even phishing websites can obtain an SSL certificate, so be sure to double-check the actual URL in incoming messages and links.

6. Types of SSL Certificates Explained

There are two "classifications" of SSL certificates, by validation level and coverage scope.

The first category checks (or doesn't check) the legal entity behind the certificate to ensure they're actually who they're claiming to be:

The second classification is by how many domains are "covered" by the certificate.

7. Who Issues SSL Certificates?

Issuing, validating, and revoking SSL certificates is all handled by a certifying authority (or CA). Browsers maintain a built-in list of trusted CAs, so if a certificate is issued by a CA on that list, browsers display the padlock. If not, they show a security warning.

Notably, root certificates are self-signed by CAs and pre-installed in operating systems and browsers. Intermediate certificates chain from a root to your site's certificate, creating the trust hierarchy that browsers verify.

Self-signed certificates are generated without a CA and trigger security warnings in every major browser. They're suitable for internal development (such as large corporations that need user authentication for file version control), but they're practically useless when deployed for an online website.

8. How to Get a Free SSL Certificate

You can usually consult your domain provider and see if they provide free SSL certificates (usually DVs) or work with specific CAs. This ensures you need to perform minimal upkeep of your SSL certificate. However, if you choose to use domain registration without hosting and set up the website yourself, Cloudflare offers free SSL for any website.

In regards to actually registering a certificate, there are three options:

Free vs. Paid SSL

Free SSL certificates (such as those from Cloudflare) are perfectly valid for most personal sites and blogs, as they're often single-domain DV certificates. For businesses, paid certificates allow you to expand on both the coverage and validation axis.

Additionally, paid SSL services often come with additional perks such as dedicated support, provider management, and automatic renewals, meaning that unless you need to overhaul your website, your SSL certificate should last forever.

For example, Register.Domains offers Comodo SSL certificates at reasonable prices, covering DV through EV and being backed by one of the most widely trusted CAs in the industry.

9. How to Install an SSL Certificate and Redirect HTTP to HTTPS

1. Install the certificate on your web server. Most modern hosting control panels (including Plesk and cPanel) offer one-click SSL installation. With Register.Domains shared hosting, SSL configuration is built directly into the setup flow.
2. Set up a 301 redirect from HTTP to HTTPS. Add the redirect in your .htaccess file (Apache) or server config (Nginx). A 301 signals to search engines that the move is permanent and transfers link equity intact.
3. Fix mixed content errors. Any page that loads HTTP resources — images, scripts, stylesheets — over an HTTPS connection will trigger browser warnings. Update all asset URLs to HTTPS or use protocol-relative URLs.
4. Update internal links, canonical tags, and XML sitemaps to reference the HTTPS versions of all URLs. On WordPress, a database search-and-replace tool handles this efficiently.
5. (Optional) Add HSTS. HTTP Strict Transport Security instructs browsers to always use HTTPS for your domain, even if a user types http:// manually. Test thoroughly before enabling, as misconfigured HSTS can lock visitors out.

10. How to Check Whether Your Website Already Has SSL

You can simply type in your domain with https:// in front. If you get an error message or are redirected to HTTP, you don't have an SSL certificate.

If you have signed up for an SSL certificate, try to navigate to http://yourdomain.com. If the certificate works, you should be automatically redirected to the HTTPS version. Then, use a redirect checker to ensure it's a permanent 301 redirect.

Beyond that, you can click on the padlock and check the actual status of the certificate. If you want to use a more thorough check, SSL Labs provides a free, detailed grade of your certificate configuration, including cipher strength and chain validity.

11. How Long Does an SSL Certificate Last and Consequences of Expiry?

SSL/TLS certificates have a maximum validity period of 397 days, enforced by all major browsers. This was reduced from two years to ensure domain owners maintain their website security. In practice, however, free or DV certificates often last only 90 days to half a year. Paid SSL certificates typically last around a year.

When a certificate expires, browsers immediately display a full-screen error that blocks visitors from accessing your site. Search engine crawlers also flag expired certificates, and organic traffic can drop sharply within days.

However, most hosting platforms and certificate providers support automatic renewal. You can enable it and check if it works by setting a notification after the initial SSL certificate expires. Notably, don't rely on "set and forget," as fully automatic renewals can fail if your payment method expires, your DNS records change, or the validation method stops working.

12. Common SSL Myths That Stop Website Owners From Acting

13. FAQs