What are the purposes, benefits, and limitations of HTTPS?

The core purpose of HTTPS is to encrypt data transmitted between a browser and a website’s server, reducing the risk of information such as login credentials and payment details being intercepted and read in transit. It may also help build user trust and improve search performance, but using HTTPS does not mean data is completely secure, nor does it guarantee higher rankings, more traffic, or increased sales. To understand its value, it is important to distinguish between protection in transit, potential business benefits, and the limitations involved in configuration and migration.

Encryption protects data in transit

A key difference between HTTP and HTTPS is whether data is encrypted. According to Semrush, HTTP transmits data in plain text, while HTTPS encrypts the content exchanged between the browser and server, making it harder for attackers to read directly. This protection covers not only credit card details but also login information and browsing activity.

• When signing in to an account: usernames and passwords need protection during transmission.
• When checking out: payment information and personal details entered need protection.
• When submitting a form: information such as names and addresses may also involve privacy concerns.

HTTPS should therefore not be seen as a feature needed only on checkout pages. Whenever a browser and server exchange data, encryption serves a protective purpose.

An extra layer of protection, not a security guarantee

In a 2023 article, yesharris cautions that HTTPS only adds protection; data can still be stolen. Its primary focus is data transmission, so “the connection is encrypted” should not be taken to mean “no data can ever be leaked.”

HSTS, which is related to HTTPS, is a separate connection setting. Search Engine Journal’s 2026 explanation states that this security header can require browsers to connect using HTTPS. Its role is to require a secure connection, not to turn HTTPS into a cure-all for every cybersecurity issue.

Trust and SEO are potential benefits, not promises of results

Semrush’s material suggests that HTTPS can help users feel more comfortable browsing, shopping, and sharing information, potentially improving retention, reducing bounce rates, or increasing conversions. However, these are possible benefits, and the material does not provide a growth figure that applies to every website.

For search, a Semrush article dated 2020 lists HTTPS as a Google ranking signal. A 2016 Neil Patel article cites research indicating only a limited positive correlation between HTTPS and higher rankings. A ranking signal is not a ranking guarantee, and correlation does not prove that HTTPS caused traffic growth. These historical explanations are also insufficient to establish its current ranking weight.

Switching to HTTPS still requires attention to configuration

Migration issues listed by Semrush include internal links that still point to HTTP and mixed content, where resources such as images and CSS still load over HTTP. This means checks need to cover not just page URLs, but also links and the resources being loaded.

Neil Patel’s 2016 article also warns that improper configuration may allow both HTTP and HTTPS versions to be indexed, creating duplicate pages and confusing visitors. This is a historical warning about migration risks, not an indication that these problems occur with every switch, and it does not establish that HTTPS itself causes traffic to decline.