HTTP vs HTTPS: Why Every Website Needs an SSL Certificate Today

HTTP vs HTTPS: Why Every Website Needs an SSL Certificate Today

I deployed my first website over HTTP. A few weeks later, I noticed Chrome had added a "Not Secure" label in the address bar. My visitors were seeing a warning before they even read a single word.

That experience taught me something important: in 2025, HTTP isn't just insecure — it's a trust signal. A missing padlock icon tells users your site is behind the times, even if your content is perfectly safe.

HTTPS is no longer optional for any website that wants to be taken seriously. The good news is that getting it is free, takes under ten minutes, and often happens automatically.

This guide explains how HTTP and HTTPS work, why the difference matters, and exactly how to get HTTPS on any website — for free.

How HTTP Works (And Why It's a Problem)

HTTP is the protocol browsers and servers use to communicate. When you visit an HTTP site, here's what happens across the network:

Browser → Server:
GET /login HTTP/1.1
Host: example.com

Server → Browser:
HTTP/1.1 200 OK
Content-Type: text/html

<form>
  <input type="password" name="password" />
</form>

When you submit that login form, your username and password travel across the network as plain text:

POST /login HTTP/1.1
Content-Type: application/x-www-form-urlencoded

username=alice&password=mysecretpassword123

Anyone on your network — at a coffee shop, hotel, airport — can intercept and read this with basic network monitoring tools. This is called a man-in-the-middle attack.

How HTTPS Fixes This

HTTPS adds TLS (Transport Layer Security) encryption between your browser and the server. The same login submission looks like this on the network:

ÿ▒&x₂Ç░╕₃ò╢▓╡▄┐ⁿ╔╙╩Ñæ╞╘▓ð╒║╜╕½ÛüÆ╦⌂£ü¬╤╬╢√╝╢╠à[garbled]

Even if intercepted, the data is useless without the encryption keys.

The TLS Handshake

Before any data transfers, browser and server negotiate the encrypted connection:

1. Browser → Server: "I support TLS 1.3, here are my cipher options"
2. Server → Browser: "Here's my TLS certificate (public key + identity proof)"
3. Browser: Verifies the certificate is signed by a trusted CA
4. Browser + Server: Generate shared session keys
5. Encrypted communication begins

This handshake takes one round trip in TLS 1.3 (down from two in TLS 1.2), adding minimal latency. After the handshake, all HTTP traffic is encrypted — the padlock appears.

SSL Certificates Explained

An SSL/TLS certificate is a digital document that:

1. Proves identity — confirms the server is actually who it claims to be
2. Contains the public key — used to establish the encrypted session
3. Is signed by a Certificate Authority (CA) — a trusted third party that verified the identity

Certificate Authorities

Your browser ships with a list of trusted CAs (Certificate Authorities) — organizations like DigiCert, GlobalSign, and Let's Encrypt. When a server presents a certificate, your browser checks:

• Was this certificate signed by a trusted CA?
• Has it expired?
• Does the domain name match?

If any check fails, the browser shows a security warning.

Types of SSL Certificates

For most websites in 2025, a free DV certificate from Let's Encrypt is sufficient. The padlock looks identical to an EV certificate in Chrome — users can't tell the difference visually.

Why HTTPS Is Now Mandatory in Practice

Chrome's "Not Secure" Warning

Since 2018, Chrome displays "Not Secure" in the address bar for all HTTP pages. On mobile, this warning is prominently displayed. Studies show this warning reduces user trust and increases bounce rates.

Google Rankings

Google officially uses HTTPS as a ranking signal. HTTP sites rank lower than equivalent HTTPS sites. For any site that cares about organic search traffic — which is most sites — this alone justifies the switch.

HTTP/2 and Performance

HTTP/2 (the modern HTTP protocol) is only available over HTTPS. HTTP/2 features:

• Multiplexing — multiple requests over one connection (eliminates head-of-line blocking)
• Header compression — reduces overhead on each request
• Server push — server can send assets before they're requested

Sites running HTTP/2 are measurably faster than HTTP/1.1 sites. See our web performance guide for a full breakdown.

Browser API Restrictions

Modern browser APIs require HTTPS:

• Geolocation API
• Service Workers (required for PWAs)
• Camera/Microphone access
• Web Push Notifications
• Payment Request API

If you're building anything beyond a static brochure site, you need HTTPS.

How to Get HTTPS Free

Option 1: Deploy on a Platform (Automatic)

The easiest option — HTTPS is automatic and free:

• Vercel — automatic on all deployments
• Netlify — automatic on all deployments
• Cloudflare Pages — automatic
• GitHub Pages — one checkbox in Settings

Zero configuration required. See our HTML and CSS beginners guide for deploying to GitHub Pages.

Option 2: Let's Encrypt with Certbot (VPS)

For servers you control:

# Install Certbot (Ubuntu/Debian with Nginx)
sudo apt install certbot python3-certbot-nginx

# Get and install certificate
sudo certbot --nginx -d yourdomain.com -d www.yourdomain.com

# Test auto-renewal
sudo certbot renew --dry-run

Certbot automatically configures Nginx, obtains the certificate, and sets up auto-renewal. Your certificate is free and renews every 90 days automatically.

Option 3: Cloudflare (Proxy HTTPS)

Point your domain to Cloudflare. Enable "Full (strict)" SSL mode. Cloudflare handles HTTPS between visitors and Cloudflare's edge network. This also gives you:

• Free CDN
• DDoS protection
• Performance optimizations

Redirecting HTTP to HTTPS

Once you have HTTPS, redirect all HTTP traffic to HTTPS:

Nginx:

server {
  listen 80;
  server_name example.com www.example.com;
  return 301 https://$host$request_uri;
}

Apache:

RewriteEngine On
RewriteCond %{HTTPS} off
RewriteRule ^ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

Vercel/Netlify: Handled automatically.

Also add the HSTS header to tell browsers to always use HTTPS and never attempt HTTP:

add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;

For a deeper understanding of how web requests work before they hit HTTPS, our how the internet works guide covers DNS, TCP, and the full request lifecycle.

Frequently Asked Questions

What's the difference between HTTP and HTTPS?

HTTP sends data as plain text. HTTPS encrypts data using TLS. Anyone intercepting HTTP traffic can read it. HTTPS traffic is unreadable without the encryption keys.

What is an SSL certificate?

A digital file that verifies your server's identity and enables TLS encryption. Required for HTTPS. Free from Let's Encrypt.

How do I get a free SSL certificate?

Deploy on Vercel, Netlify, or GitHub Pages (automatic), or use Let's Encrypt's Certbot on a VPS. No reason to pay for SSL in 2025.

What is TLS vs SSL?

TLS is the modern, secure version of the deprecated SSL protocol. The term "SSL certificate" persists but the actual protocol used is TLS 1.2 or 1.3.

Does HTTPS slow down my site?

No — TLS 1.3 and HTTP/2 (HTTPS-only) make modern HTTPS sites faster than HTTP/1.1 sites.