What is the difference between HTTP and HTTPS?
Technical differences
HTTP (Hypertext Transfer Protocol) sends data in plain text, meaning anyone who intercepts the connection can read it. HTTPS (HTTP Secure) uses SSL/TLS to encrypt the data before transmission, so even if intercepted, it appears as gibberish. HTTPS also verifies the identity of the website through a certificate, preventing man-in-the-middle attacks.
HTTP typically uses port 80, while HTTPS uses port 443. When you visit an HTTPS site, your browser and the server perform a TLS handshake to establish a secure connection, exchanging keys and agreeing on encryption algorithms.
- HTTP: no encryption, port 80
- HTTPS: encryption via SSL/TLS, port 443
- HTTPS requires a certificate
- HTTPS is faster with HTTP/2, which requires encryption
Why HTTPS matters
HTTPS is essential for protecting user privacy, especially on sites that handle login credentials, payment details, or personal information. It also prevents ISPs and attackers from injecting ads or malware into web pages. Major browsers now mark HTTP sites as 'Not Secure', which can damage trust and drive visitors away.
Search engines like Google give a slight ranking boost to HTTPS pages, and many modern web features (e.g., geolocation, push notifications) require a secure context. As a result, HTTPS has become the default for virtually all websites.
Common mistakes
- Thinking HTTPS is only needed for login pages; all pages should be served over HTTPS to prevent session hijacking and content tampering.
- Believing HTTPS makes a website completely secure; it only secures the connection, not the site's code or server.
- Assuming HTTPS is slower; modern optimizations make the difference negligible, and HTTP/2 can make HTTPS faster.
