HTTPS is the secure version of HTTP, the protocol that encrypts communication between a browser and a server so data can’t be read or altered in transit. It’s the reason a padlock icon shows up in the address bar instead of a plain, unsecured connection.
Beyond encryption, HTTPS also protects user data during transmission, improves how much visitors trust a website, and functions as a technical SEO factor Google has confirmed it takes into account. Understanding what runs behind that padlock, including which https port handles the connection, makes the rest of web security much easier to follow.
How HTTPS Works
At a basic level, HTTPS works by encrypting the data exchanged between a user’s browser and a website’s server, so anyone intercepting that traffic sees scrambled information instead of readable content.
This encryption relies on SSL/TLS certificates, which also handle authentication, confirming that the server a browser is talking to is actually the one it claims to be, not an impersonator.
The Default HTTPS Port (443)
Every connection needs a port to travel through, and HTTPS has a standard one: port 443. That’s the default https port used across the web, while regular HTTP traffic runs through port 80.
So what port does HTTPS use in practice? Unless a server is specifically configured otherwise, browsers automatically connect over port 443 the moment they see an “https://” address, without the user ever needing to think about the https port number involved.
The Role of SSL/TLS Certificates
An SSL/TLS certificate is what makes the secure part of HTTPS possible. It’s issued by a Certificate Authority and serves two purposes: encrypting the connection and verifying the website’s identity.
Browsers check this certificate automatically. If it’s missing, expired, or invalid, most browsers throw up a warning page rather than silently connecting, which understandably makes visitors think twice before continuing. A valid certificate is what keeps that warning from ever appearing.
HTTPS vs HTTP: What’s the Difference?
The difference between HTTPS and HTTP comes down to a handful of practical points:
- Security: HTTPS encrypts data in transit; HTTP does not.
- Authentication: HTTPS confirms server identity through a certificate; HTTP has no such check.
- Browser behavior: Modern browsers actively flag HTTP sites as “Not Secure,” while HTTPS sites show a padlock with no warning.
- SEO impact: HTTPS is treated as a positive ranking signal; HTTP sites don’t get that benefit.
- Port used: HTTPS defaults to port 443, while HTTP defaults to port 80.
Given browsers now warn users away from unencrypted pages by default, HTTP has effectively become a liability rather than a neutral choice. Modern websites are expected to run on HTTPS as a baseline, not an upgrade.
Why HTTPS Is Important for SEO and User Trust
HTTPS matters for more than just encryption. Google has confirmed it as a ranking signal, meaning secure sites get a small, consistent advantage over otherwise identical unencrypted ones.
The bigger, more visible impact is trust. Browser security indicators, the padlock, the warning labels, directly shape whether a visitor feels safe entering personal information, making a purchase, or even staying on the page at all. A secure connection also contributes to a smoother overall experience, since browsers no longer interrupt the visit with security prompts.
This is why HTTPS is typically one of the first checks in any technical SEO audit, alongside other infrastructure factors like server response time and caching. It’s a foundational piece, not an optional add-on layered on top of good content.
The Bottom Line
HTTPS runs on port 443 by default, uses SSL/TLS certificates to encrypt and authenticate connections, and has become the expected standard for any website that wants to be trusted by both users and search engines. Skipping it isn’t really an option anymore, it’s one of the few technical SEO factors with a direct, confirmed effect on rankings and a very visible effect on how visitors perceive a site.
Related Terms
- What Is a Cache: another technical factor affecting site speed and delivery
- What Is Schema Markup: structured data that works alongside HTTPS as part of technical SEO
- How to Do SEO: where HTTPS and other technical fixes fit into a full SEO process
Supporting Content
- Google Search Central: HTTPS as a Ranking Signal: Google’s original announcement confirming HTTPS as a ranking factor
- SEO Audit: for checking HTTPS setup alongside other technical SEO issues
- SEO Checklist: a practical resource covering HTTPS and other technical basics