TLS 1.2 vs TLS 1.3: What Actually Changed
28/07/2026
Every time an HTTPS connection opens, the browser and the server negotiate how to encrypt the traffic. That negotiation is called the TLS handshake. The protocol version they use directly affects both load speed and security. Two versions are relevant today: the older but still widespread TLS 1.2, and the modern TLS 1.3.
Why TLS 1.3 is faster
The biggest practical difference is the number of steps in the handshake. TLS 1.2 needs two rounds of message exchange (two round-trips) before data transfer begins. TLS 1.3 cuts that to a single round, and for returning visitors it offers 0-RTT resumption — the connection is established with virtually no delay. On mobile networks with high latency, that difference can be measured in hundreds of milliseconds per connection.
Why it is more secure
TLS 1.3 dropped outdated and vulnerable algorithms — RC4, 3DES, SHA-1, static RSA key exchange. Only modern, vetted cipher suites with forward secrecy remain, which means that even if someone steals the private key one day, they cannot decrypt previously recorded traffic. Fewer options also means less room for configuration mistakes.
- TLS 1.2 — still secure when configured correctly, but it allows weak algorithms that must be disabled manually.
- TLS 1.3 — secure by default, faster handshake, simpler configuration.
- Legacy — TLS 1.0 and 1.1 are officially deprecated and should no longer be used.
How to check which version you use
The easiest way is a free SSL test (such as SSL Labs) that lists every supported version and grades your configuration. In the browser you can open Developer Tools, the Security tab, and see the protocol for the current page. The goal is for the server to offer both TLS 1.2 and 1.3 while older versions are disabled.
The good news: on modern hosting you do not have to configure anything by hand. Our SEO hosting plans support TLS 1.3 and free SSL by default, so your site is instantly on the fastest and safest protocol. See the plans and pricing if you want to compare.
Frequently asked questions
Do I have to install TLS 1.3 myself? No, it is a server-side matter and usually already enabled. Your only job is to disable old versions if your host allows it.
Do older browsers work with TLS 1.3? All modern browsers have supported it for years; very old devices fall back to TLS 1.2, which is why we keep it enabled.
If you are just setting up HTTPS, start with the guide on SSL certificates and HTTPS, then enable the HSTS header to enforce encrypted connections, and fix any mixed content problem.